YCK承认通过项目NextPhase欧洲研究委员会（ERC STG 278616）的财政支持。作者也承认从中心国家D&#39;空间研究 （法国国家空间研究中心，法国）通过项目SHYRO（动作R＆T R-S10/LN-0001-004/DA：10076201）的支持，从ANR项目ORA（BLAN 031202），从地区德弗朗什-孔泰 ，法国。

该协议包括5个主要的阶段：在第一个，回音壁模式谐振器。为了控制的进展的谐振器的研磨，表面状态的测量被进行。在第三阶段，我们制造的工具，将推出光在谐振器。一旦这两个主要工具的制造，我们用它们来可视光的高Q值谐振。最后，用一个高功率的输入激光束时，谐振器的行为以非线性方式产生克尔梳。 1。抛光谐振器在此阶段，光学窗的晶体谐振器（掺杂MgF 2或CaF 2的，随时可以从光学元件的零售商）的形状和抛光。此抛光过程，并将其转换成高品质的WGM谐振器。定制抛光塔计划1。 <ol><li>上胶晶体光学窗口坚持可以持有的空气轴承主轴马达。 </li><li>外套一个V形的金属导板与相应的抛光支持组织，倾10μm的磨料粉（氧化铝，金刚石，或碳化硅）与水混合。本指南的方法旋转盘（约5000转，将20g压力），并开始把它磨。根据不同的材料和纺丝速度，这个过程可以持续2小时（CaF 2的 ），4小时（MgF 2中）。该抛光步骤将其双凸形状的谐振器。在此步骤结束时，该磁盘应方案2中提出的形状。 </li><li>下一个步骤通常 ​​被称为“”程序24的磨削和抛光。它通常由重复前面的步骤，磨料颗粒的大小为10微米，3微米，1微米，250纳米，并最终为100nm。支持组织应适应每个粒子的大小，较小的晶粒僵硬。为了避免划伤和条纹，可以进行导向的水平换算。在每个步骤中的连续的研磨和抛光，表面状态应予以改善。 </li></ol> 2。国家控制的表面<ol><li>在光学显微镜下的可视化控制的表面状态控制的第一步是：磁盘是不透光，在第一阶段，然而，成功后的1微米的颗粒抛光，磁盘变得透明，其两侧反射光线：所谓所谓已达到光学抛光的谐振器的品质因数应在10 5 - 10 6范围内。 </li><li>对于较小的磨料，眼睛不能够评价的表面状态，即使使用一个标准的显微镜。在这一点上，一个干涉测量的表面状态是必要的。使用的显微镜​​配备一个Mirau干涉物镜与白色光源。无线网络的干扰的谐振器的图像第一个参考平面上，从而显示出一个白色的光移相加工工具的表面的高度独立的波长，即几纳米的分辨率的一小部分在每个点。这种测量方法也可以用于评估的盘25的曲率。 </li><li>通过修改样品和目标之间的长度，确定的谐振器的反射光相位，计算出的表面的高度变化。这可以是由于一台专用计算机，自动化，并在地图上的表面高度被创建时，允许用于测定样品的粗糙度。监视器的表面粗糙度，如在图1中解释，停止研磨抛光程序的干涉条纹时，尽可能顺利。 </li></ol> 3。绘制圆锥在共振器中的光耦合，一个非常小的光纤是必要的：它的直径应为约3微米（小于人的头发丝的20倍左右）。 <ol><li>剥去一个标准的单模石英光纤（SMF）关闭一个约5厘米长的塑料和聚合物涂层。对于监测的目的，纤维应被连接到激光源，在其输入端，在其输出端和一个光电二极管。 </li><li>修正每种尺寸的未涂覆部分的纤维，以计算机控制的高分辨率的电机。通过计算机接口的电机，将它们配置为移动不断加速运动，从而使纤维的每一侧拉开。 </li><li>的两个固定点之间的未涂覆的光纤加热用喷灯灯约1分钟，然后再开始拉伸。火焰应轻柔为了不吹锥度一旦它是非常小的。 </li><li>启动电机的运动，并且因此，该纤维的拉伸。一旦开始绘图，人们可以监测传输使用的激光源和一个光电二极管的锥度：干涉图样出现在这个过程中，它们的频率会增加，并且，最后，他们将消失腰身直径在1微米附近。在此阶段中，电机和火焰应同时停止。 </li></ol> 4。在WGM谐振器的光耦合在此阶段，锥度用于耦合光在共振器中观察的空腔，这些值表示在图2中的高Q值的本征模。 <ol><li>修复谐振器一个3轴压电控制翻译阶段。接近它的锥形光纤，在距离小于1微米。锥形光纤和谐振器的相对位置进行监测，由于显微镜，和反射镜是用来控制上的垂直位置和倾斜角。 </li><li>锥形光纤连接到一个可见激光二极管的谐振器应点亮时的耦合效率， 如图3所示。 </li><li>锥形光纤连接一个窄线宽（窄于线宽的共振）的一端，和一个光电二极管的另一端连接到示波器的模式跳自由激光。可以通过以下方式获得在输入​​扫描波长的谐振器的传输响应。评价使用得到的透射光谱的谐振器的品质因数，计算模式和它们的线宽（半峰全宽）的谐振频率之间的比率。 </li><li>更精确的测量进行与“腔环式”的实验26，波长扫描速度不够快，获得之间的谐振共鸣之光衰减在随后的时间和失谐光干扰。人们可以微调锥形的定位和谐振器的Q因子增加耦合，并获得如图4所示的典型模式。相关的拟合曲线给出的谐振器的品质因数。 </li></醇&gt; 5。生成梳在这最后的阶段，高功率泵激光激发谐振器的非线性效应。 <ol><li>插入可调谐激光器和谐振器之间的光放大器。 </li><li>由于光电二极管和示波器，进行微调，使所述激光源的输入波长的谐振旁边。 </li><li>一个高分辨率的光学频谱分析仪的输出光纤连接，增加的输入功率，同时稍微失谐的泵浦波长。新的频率上会出现泵的每一侧峰：这是一个克尔光学频率梳。 </li><li>切换到光电二极管，我们可以观察到不同的频谱模式创建之间的殴打。使用微波带通滤波器，一个可以在该电信号中分离出纯的频率非常低的噪声。 </li></ol>

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作者宣称，他们有没有竞争经济利益。

此协议允许生产高Q值的光学谐振器，光耦合到他们，并引发各种微波光子学应用的非线性现象。 粗磨的第一步骤中，应该给它的形状为谐振器。与10微米的研磨粉，研磨在一个小时后，应该是方便的谐振器的一侧的边缘形（见方案2）。下面的步骤中的谐振器的表面平滑，并达到1微米直径的研磨粉的阶段时，其表面应该是透明的。这就是所谓的光学抛光。?...

回音壁模式谐振器是微型或毫米波半径1,2,3,4磁盘或领域。 ，谐振器几乎是完美的形（纳米尺寸的表面粗糙度），激光可能会被困在它的本征模，通常被称为的回音壁模式下（WGMS）通过全内反射。他们的自由光谱范围（或联运频率）可以从GHz的太赫兹谐振器的半径取决于不同，而他们的品质因数 Q可以是非常高的，从10月7日至10月11日。由于其独特的属性，储存和放慢光线，WGM光学谐振器已用于执行许多光信号处理的任务3：滤波，放大，时间拖延等 。随着制造技术的不断提高，其前所未有的品质因素使它们适合更苛刻的应用，计量或定量6-13 UM基于应用。 在这些超高Q值谐振器，体积小，禁闭，光子密度高，光子寿命长的（比例为Q）诱发很强的光与物质的相互作用，这可能会激发各种WGMS通过各种非线性效应，如克尔，拉曼布里渊例如14-19。在回音壁模式谐振器使用非线性现象提出了一个很有前途的超纯水微波和光波产生的范式转变。事实上，这个话题相交这么多领域的基础科学和技术是一个明确的指标，它具有极强的潜在影响广泛的学科。尤其是，航空航天以及通讯工程技术是目前需要特殊的连贯性，多功能微波和光波信号。 WGM技术超过现有或其他潜在的方法有几个优点：概念简单，Higher鲁棒性，较小的功耗，更长的使用寿命，抗干扰性，体积非常紧凑，频率的多功能性，易于芯片的集成度，以及强大的微波和光波技术的主流标准光子元件整合潜力。 在航天工程中，石英振荡器两个导航系统（飞机，卫星，宇宙飞船等 ）和检测系统（雷达，传感器等 ）作为主要的微波源占绝对主导地位。然而，它被一致认可的今天，石英振荡器的频率稳定性能达到地板，并不会显着提高了。在同一直线上，它们的频率是有限的，通用性，因此难以使超稳定的超过40 GHz的微波产生。微波光子振荡器的预期来克服这些限制。另一方面，在通信工程，微波光子IC振荡器预计也将在光通信网络的关键组成部分，在那里他们将执行以前所未有的效率光波/微波转换。他们还与光波技术的紧凑型全光学元件持续的趋势，这使超高速处理[上/下变频，（德）调制，放大，复用，混合等 ，而无需操纵大规模（然后，缓慢）的电子。这个概念的紧凑型光子光子控制电路中通过非线性介质光子旨在规避源于与有限的光电处理速度几乎无限的光带宽瓶颈。光通信系统也非常苛刻的超低相位噪声微波炉，以满足两个时钟（低相位噪声相当于低抖动）和带宽（比特率增加的时钟频率成比例）的要求。事实上，在高速COMMUNication网络，这种超稳定的振荡器用于多种用途（上/下变频的本地振荡器，网络同步，载波合成等 ）的基本的引用。 WGM谐振器中的非线性现象的研究打开新的视野，为其他的应用，如拉曼和布里渊激光器。更一般地，这些现象都可以被合并在从更宽的视野光学腔与波导中的非线性现象，它是一种结晶或硅光子卓有成效的范例。强有力的约束和很长的使用寿命光子进入圆环WGMS还提供了一个优异的测试台进行调查，凝聚态物理和量子物理的基本问题。比赛不断增加电磁信号的准确性，也有助于回答典型的物理问题，涉及到相对论（洛伦兹不变性测试），或一个基本物理常数的测量ND他们可能随时间的变化。 在这篇文章中，获得晶体的光学回音壁模式（WGM）谐振器所需的不同步骤的描述和他们的定性解释。协议还提出，获得高品质的锥形光纤需要夫妇到这些谐振器的激光。最后，这些谐振器在微波光子学领域，即超稳定产生微波，采用克尔梳子，一个旗舰应用程序介绍和讨论。 在第一部分中，我们详细的协议遵循，获得超高 Q WGM谐振器。我们的方法依赖于研磨和抛光的方法，这让人联想到用来打磨，比如镜头或望远镜反射镜的光学元件的标准技术。第二部分专门用于表征表面粗糙度。我们使用一种非接触式白光干涉轮廓仪测量表面ŗ从而导致表面散射引起的损失，从而降低Q因子性能oughness。此步骤是一个重要的实验测试，以评估质量的抛光。与制造有关的第三部分，以发射光在共振器中的纤维直径在微米范围的锥形二氧化硅。要达到这样的小直径，我们采用“刷牙火焰”技术，同时使用计算机控制的电机，除了拉光纤，喷灯加热纤维面积圆锥20。在第四部分中，彼此接近的谐振器和锥形光纤的使用波长扫描激光的回音壁模式以可视化的共振信号。我们表明在第五部分，通过在共振器中的光功率增加，如何管理触发非线性现象，直到我们观察到克尔光学频率梳的形成，用频谱等距的谱线。由于电子以上mphasized，这些科尔梳光谱具有特殊的特点，是适合一些应用科学和技术21-23。我们会考虑WGM谐振器最值得关注的应用之一通过展示多波长光信号，其联运是一个超稳定的微波频率。

<table border="1">
<tbody>
 <tr>
 <td> Material Name</td>
 <td>Company</td>
 </tr>
 <tr>
 <td>Step motors 50 mm course</td>
 <td>Thorlabs</td>
 </tr>
 <tr>
 <td>3 axis nanostage</td>
 <td>Physik Instrumente</td>
 </tr>
 <tr>
 <td>TUNICS tunable laser source</td>
 <td>Yenista</td>
 </tr>
 <tr>
 <td>Optical spectrum analyzer APEX</td>
 <td>APEX Technologies</td>
 </tr>
 </tbody>
</table>

microwave photonics systems based on whispering-gallery-mode resonators

微波光子系统从根本上依赖微波和光信号之间的相互作用。这些系统是非常有前途的技术和应用科学的各个领域，如航空航天与通信工程，传感，计量，非线性光子学和量子光学。在这篇文章中，我们提出了在我们的实验室中使用的主要技术，建立基于超高 Q回音壁模式谐振器的微波光子系统。在本文中详述首先是谐振器的抛光，这是基于用于抛光透镜望远镜的反射镜等光学部件的研磨和抛光技术的协议。然后，白光干涉轮廓仪测量表面粗糙度，这是一个关键的参数来表征的抛光质量。为了启动光在共振器中，一个锥形的二氧化硅纤维直径在微米范围被使用。要达到这样的小直径，我们采用“刷牙火焰”技术，同时使用计算机控制的电机，除了拉光纤，喷灯加热纤维面积锥形。谐振器和锥形光纤后来走近彼此以可视化的回音壁模式使用的波长扫描激光共振信号。通过增加的谐振器中的光功率，非线性现象被触发的克尔光学频率梳，直到形成等距的谱线的光谱观察。这些克尔梳光谱有特殊的特点，是适合在科学和技术的几个应用程序。我们认为超稳定的微波频率合成和应用，展示了一代克尔GHz的联运频率梳。

这五个步骤的协议能够获得WGM谐振器的微波光子的应用具有非常高的品质因素。 第一个步骤的目的是给到谐振器所要求的形状，表示方案2。这里的主要困难是生产磁盘，其边缘不够锐利，这样就可以强烈被困光子限制，而导致结构脆弱，从机械的角度来看。这种抛光塔也具有非凡的功能，因为它允许研磨磁盘的大小，形状和散装材料具有很大的可变性。 <p cla...

Watch this Scientific Journal Video about Microwave Photonics Systems Based on Whispering-gallery-mode Resonators at JoVE.com

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

定制的技术建立在我们的实验室开发的基于超高Q回音壁模式谐振器的微波光子系统。详细协议，以取得和表征这些谐振，和他们的一些应用在微波光子学的解释。

基于微波光子系统回音壁模式谐振器

Microwave photonics systems rely fundamentally on the interaction between microwave and optical signals. These systems are extremely promising for various ...

microwave-photonics-systems-based-on-whispering-gallery-mode

Research

JoVE Journal

Engineering

16.8K 次观看.  FEMTO-ST Institute. 定制的技术建立在我们的实验室开发的基于超高Q回音壁模式谐振器的微波光子系统。详细协议，以取得和表征这些谐振，和他们的一些应用在微波光子学的解释。

视频: Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Fabricating Metamaterials Using the Fiber Drawing Method

Metamaterials are man-made composite materials, fabricated by assembling components much smaller than the wavelength at which they operate 1. They owe their electromagnetic properties to the structure of their constituents, instead of the atoms that compose them. For example, sub-wavelength metal wires can be arranged to possess an effective electric permittivity that is either positive or negative at a given frequency, in contrast to the metals themselves 2. This unprecedented control over the behaviour of light can potentially lead to a number of novel devices, such as invisibility cloaks 3, negative refractive index materials 4, and lenses that resolve objects below the diffraction limit 5. However, metamaterials operating at optical, mid-infrared and terahertz frequencies are conventionally made using nano- and micro-fabrication techniques that are expensive and produce samples that are at most a few centimetres in size 6-7. Here we present a fabrication method to produce hundreds of meters of metal wire metamaterials in fiber form, which exhibit a terahertz plasmonic response 8. We combine the stack-and-draw technique used to produce microstructured polymer optical fiber 9 with the Taylor-wire process 10, using indium wires inside polymethylmethacrylate (PMMA) tubes. PMMA is chosen because it is an easy to handle, drawable dielectric with suitable optical properties in the terahertz region; indium because it has a melting temperature of 156.6 &deg;C which is appropriate for codrawing with PMMA. We include an indium wire of 1 mm diameter and 99.99% purity in a PMMA tube with 1 mm inner diameter (ID) and 12 mm outside diameter (OD) which is sealed at one end. The tube is evacuated and drawn down to an outer diameter of 1.2 mm. The resulting fiber is then cut into smaller pieces, and stacked into a larger PMMA tube. This stack is sealed at one end and fed into a furnace while being rapidly drawn, reducing the diameter of the structure by a factor of 10, and increasing the length by a factor of 100. Such fibers possess features on the micro- and nano- scale, are inherently flexible, mass-producible, and can be woven to exhibit electromagnetic properties that are not found in nature. They represent a promising platform for a number of novel devices from terahertz to optical frequencies, such as invisible fibers, woven negative refractive index cloths, and super-resolving lenses.

Metamaterials at terahertz frequencies offer unique opportunities, but are challenging to fabricate in bulk. We adapt the fabrication procedure for microstructured polymer optical fibers to inexpensively fabricate metamaterials potentially on an industrial scale. We produce polymethylmethacrylate fibers containing ~10 &mu;m diameter indium wires separated by ~100 &mu;m, which exhibit a terahertz plasmonic response.

制造超材料使用光纤拉丝法

Metamaterials are man-made composite materials, fabricated by assembling components much smaller than the wavelength at which they operate 1. They owe ...

科研

工程学

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Optical modes of dielectric micro-cavities have received significant attention in recent years for their potential in a broad range of applications. The optical modes are frequently referred to as "whispering gallery modes" (WGM) or "morphology dependent resonances" (MDR) and exhibit high optical quality factors. Some proposed applications of micro-cavity optical resonators are in spectroscopy1, micro-cavity laser technology2, optical communications3-6 as well as sensor technology. The WGM-based sensor applications include those in biology7, trace gas detection8, and impurity detection in liquids9. Mechanical sensors based on microsphere resonators have also been proposed, including those for force10,11, pressure12, acceleration13 and wall shear stress14. In the present, we demonstrate a WGM-based electric field sensor, which builds on our previous studies15,16. A candidate application of this sensor is in the detection of neuronal action potential.
The electric field sensor is based on polymeric multi-layered dielectric microspheres. The external electric field induces surface and body forces on the spheres (electrostriction effect) leading to elastic deformation. This change in the morphology of the spheres, leads to shifts in the WGM. The electric field-induced WGM shifts are interrogated by exciting the optical modes of the spheres by laser light. Light from a distributed feedback (DFB) laser (nominal wavelength of ~ 1.3 &mu;m) is side-coupled into the microspheres using a tapered section of a single mode optical fiber. The base material of the spheres is polydimethylsiloxane (PDMS). Three microsphere geometries are used: (1) PDMS sphere with a 60:1 volumetric ratio of base-to-curing agent mixture, (2) multi layer sphere with 60:1 PDMS core, in order to increase the dielectric constant of the sphere, a middle layer of 60:1 PDMS that is mixed with varying amounts (2% to 10% by volume) of barium titanate and an outer layer of 60:1 PDMS and (3) solid silica sphere coated with a thin layer of uncured PDMS base. In each type of sensor, laser light from the tapered fiber is coupled into the outermost layer that provides high optical quality factor WGM (Q ~ 106). The microspheres are poled for several hours at electric fields of ~ 1 MV/m to increase their sensitivity to electric field.

A high-sensitivity photonic micro sensor was developed for electric field detection. The sensor exploits the optical modes of a dielectric sphere. Changes in the external electric field perturb the sphere morphology leading to shifts in its optical modes. The electric field strength is measured by monitoring these optical shifts.

回音壁模式聚合物微光学电场传感器的发展

Optical modes of dielectric micro-cavities have received significant attention in recent years for their potential in a broad range of applications. The ...

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Single GaN nanowire (NW) devices fabricated on SiO2 can exhibit a strong degradation after annealing due to the occurrence of void formation at the contact/SiO2 interface. This void formation can cause cracking and delamination of the metal film, which can increase the resistance or lead to a complete failure of the NW device. In order to address issues associated with void formation, a technique was developed that removes Ni/Au contact metal films from the substrates to allow for the examination and characterization of the contact/substrate and contact/NW interfaces of single GaN NW devices. This procedure determines the degree of adhesion of the contact films to the substrate and NWs and allows for the characterization of the morphology and composition of the contact interface with the substrate and nanowires. This technique is also useful for assessing the amount of residual contamination that remains from the NW suspension and from photolithographic processes on the NW-SiO2 surface prior to metal deposition. The detailed steps of this procedure are presented for the removal of annealed Ni/Au contacts to Mg-doped GaN NWs on a SiO2 substrate.

A technique was developed that removes Ni/Au contact metal films from their substrate to allow for the examination and characterization of the contact/substrate and contact/NW interfaces of single GaN nanowire devices.

单氮化镓纳米线设备分析接触界面

Single GaN nanowire (NW) devices fabricated on SiO2 can exhibit  a strong degradation after annealing due to the  occurrence of void formation at the ...

Analyzing the Movement of the Nauplius 'Artemia salina' by Optical Tracking of Plasmonic Nanoparticles

We demonstrate how optical tweezers may provide a sensitive tool to analyze the fluidic vibrations generated by the movement of small aquatic organisms. A single gold nanoparticle held by an optical tweezer is used as a sensor to quantify the rhythmic motion of a Nauplius larva (Artemia salina) in a water sample. This is achieved by monitoring the time dependent displacement of the trapped nanoparticle as a consequence of the Nauplius activity. A Fourier analysis of the nanoparticle&#39;s position then yields a frequency spectrum that is characteristic to the motion of the observed species. This experiment demonstrates the capability of this method to measure and characterize the activity of small aquatic larvae without the requirement to observe them directly and to gain information about the position of the larvae with respect to the trapped particle. Overall, this approach could give an insight on the vitality of certain species found in an aquatic ecosystem and could expand the range of conventional methods for analyzing water samples.

Analyzing the Movement of the Nauplius &#039;Artemia salina&#039; by Optical Tracking of Plasmonic Nanoparticles

We use optical tracking of plasmonic nanoparticles to probe and characterize the frequency movements of aquatic organisms.

分析无节幼体的运动“<em&gt;卤虫</em&gt;&#39;由电浆纳米粒子的光学跟踪

We demonstrate how optical tweezers may provide a sensitive tool to analyze the fluidic vibrations generated by the movement of small aquatic organisms. A ...

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

The wettability of silicon (Si) is one of the important parameters in the technology of surface functionalization of this material and fabrication of biosensing devices. We report on a protocol of using KrF and ArF lasers irradiating Si (001) samples immersed in a liquid environment with low number of pulses and operating at moderately low pulse fluences to induce Si wettability modification. Wafers immersed for up to 4 hr in a 0.01% H2O2/H2O solution did not show measurable change in their initial contact angle (CA) ~75&#176;. However, the 500-pulse KrF and ArF lasers irradiation of such wafers in a microchamber filled with 0.01% H2O2/H2O solution at 250 and 65 mJ/cm2, respectively, has decreased the CA to near 15&#176;, indicating the formation of a superhydrophilic surface. The formation of OH-terminated Si (001), with no measurable change of the wafer&#8217;s surface morphology, has been confirmed by X-ray photoelectron spectroscopy and atomic force microscopy measurements. The selective area irradiated samples were then immersed in a biotin-conjugated fluorescein-stained nanospheres solution for 2 hr, resulting in a successful immobilization of the nanospheres in the non-irradiated area. This illustrates the potential of&#160;the method for selective area biofunctionalization and fabrication of advanced Si-based biosensing architectures. We also describe a similar protocol of irradiation of wafers immersed in methanol (CH3OH) using ArF laser operating at pulse fluence of 65 mJ/cm2 and in situ formation of a strongly hydrophobic surface of Si (001) with the CA of 103&#176;. The XPS results indicate ArF laser induced formation of Si&#8211;(OCH3)x compounds responsible for the observed hydrophobicity. However, no such compounds were found by XPS on the Si surface irradiated by KrF laser in methanol, demonstrating the inability of the KrF laser to photodissociate methanol and create -OCH3 radicals.

We report on a process of in situ alteration of HF treated Si (001) surface into a hydrophilic or hydrophobic state by irradiating samples in microfluidic chambers filled with&#160;H2O2/H2O solution (0.01%-0.5%) or methanol solutions using pulsed UV laser of a relative low pulse fluence.

硅表面润湿性的选择区域改性脉冲紫外激光照射在液体环境

The wettability of silicon (Si) is one of the important parameters in the technology of surface functionalization of this material and fabrication of ...

Writing Bragg Gratings in Multicore Fibers

Fiber Bragg gratings in multicore fibers can be used as compact and robust filters in astronomical and other research and commercial applications. Strong suppression at a single wavelength requires that all cores have matching transmission profiles. These gratings cannot be inscribed using the same method as for single-core fibers because the curved surface of the cladding acts as a lens, focusing the incoming UV laser beam and causing variations in exposure between cores. Therefore we use an additional optical element to ensure that the beam shape does not change while passing through the cross-section of the multicore fiber. This consists of a glass capillary tube which has been polished flat on one side, which is then placed over the section of the fiber to be inscribed. The laser beam enters the fiber through the flat surface of the capillary tube and hence maintains its original dimensions. This paper demonstrates the improvements in core-to-core uniformity for a 7-core fiber using this method. The technique can be generalized to larger multicore fibers.

We describe a technique for inscribing identical fiber Bragg gratings into each core of a multicore fiber. This is achieved by introducing an additional surface into the optical path to mitigate lensing by the curved surface of the fiber cladding.

写布拉格光栅在多核纤维

Fiber Bragg gratings in multicore fibers can be used as compact and robust filters in astronomical and other research and commercial applications. Strong ...

Fabrication and Characterization of Superconducting Resonators

Superconducting microwave resonators are of interest for a wide range of applications, including for their use as microwave kinetic inductance detectors (MKIDs) for the detection of faint astrophysical signatures, as well as for quantum computing applications and materials characterization. In this paper, procedures are presented for the fabrication and characterization of thin-film superconducting microwave resonators. The fabrication methodology allows for the realization of superconducting transmission-line resonators with features on both sides of an atomically smooth single-crystal silicon dielectric. This work describes the procedure for the installation of resonator devices into a cryogenic microwave testbed and for cool-down below the superconducting transition temperature. The set-up of the cryogenic microwave testbed allows one to do careful measurements of the complex microwave transmission of these resonator devices, enabling the extraction of the properties of the superconducting lines and dielectric substrate (e.g., internal quality factors, loss and kinetic inductance fractions), which are important for device design and performance.

Superconducting microwave resonators are of interest for detection of light, quantum computing applications and materials characterization. This work presents a detailed procedure for fabrication and characterization of superconducting microwave resonator scattering parameters.

制备与表征超导谐振器的

Superconducting microwave resonators are of interest for a wide range of applications, including for their use as microwave kinetic inductance detectors ...

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Dielectric microspheres can confine light and sound for a length of time through high quality factor whispering gallery modes (WGM). Glass microspheres can be thought as a store of energy with a huge variety of applications: compact laser sources, highly sensitive biochemical sensors and nonlinear phenomena. A protocol for the fabrication of both the microspheres and coupling system is given. The couplers described here are tapered fibers. Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility &#935;(3) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS). A proof of the cavity-enhanced phenomenon is given by the lack of correlation among the pump, signal and idler: a resonant mode has to exist in order to obtain the pair of signal and idler. In the case of hyperparametric oscillations (four wave mixing and stimulated anti-stokes Raman scattering), the modes must fulfill the energy and momentum conservation and, last but not least, have a good spatial overlap.

Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility &#935;(3) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS).

刺激斯托克斯和反斯托克斯拉曼散射在微球形回音壁模式谐振器

Dielectric microspheres can confine light and sound for a length of time through high quality factor whispering gallery modes (WGM). Glass microspheres ...

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

Small silver clusters confined inside zeolite matrices have recently emerged as a novel type of highly luminescent materials. Their emission has high external quantum efficiencies (EQE) and spans the whole visible spectrum. It has been recently reported that the UV excited luminescence of partially Li-exchanged sodium Linde type A zeolites [LTA(Na)] containing luminescent silver clusters can be controlled by adjusting the water content of the zeolite. These samples showed a dynamic change in their emission color from blue to green and yellow upon an increase of the hydration level of the zeolite, showing the great potential that these materials can have as luminescence-based humidity sensors at the macro and micro scale. Here, we describe the detailed procedure to fabricate a humidity sensor prototype using silver-exchanged zeolite composites. The sensor is produced by suspending the luminescent Ag-zeolites in an aqueous solution of polyethylenimine (PEI) to subsequently deposit a film of the material onto a quartz plate. The coated plate is subjected to several hydration/dehydration cycles to show the functionality of the sensing film.

A protocol for the synthesis of moisture-responsive luminescent Ag-zeolite composites is described in this report.

纳米银沸石复合材料作为基于发光的湿度传感器

Small silver clusters confined inside zeolite matrices have recently emerged as a novel type of highly luminescent materials. Their emission has high ...

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Terahertz (THz) split ring resonator (SRR) metamaterials (MMs) has been studied for gas, chemical, and biomolecular sensing applications because the SRR is not affected by environmental characteristics such as the temperature and pressure surrounding the resonator. Electromagnetic radiation in THz frequencies is biocompatible, which is a critical condition especially for the application of the biomolecular sensing. However, the quality factor (Q-factor) and frequency responses of traditional thin-film based split ring resonator (SRR) MMs are very low, which limits their sensitivities and selectivity as sensors. In this work, novel nanopillar-based SRR MMs, utilizing displacement current, are designed to enhance the Q-factor up to 450, which is around 45 times higher than that of traditional thin-film-based MMs. In addition to the enhanced Q-factor, the nanopillar-based MMs induce a larger frequency shifts (17 times compared to the shift obtained by the traditional thin-film based MMs). Because of the significantly enhanced Q-factors and frequency shifts as well as the property of biocompatible radiation, the THz nanopillar-based SRR are ideal MMs for the development of biomolecular sensors with high sensitivity and selectivity without inducing damage or distortion to biomaterials. A novel fabrication process has been demonstrated to build the nanopillar-based SRRs for displacement current mediated THz MMs. A two-step gold (Au) electroplating process and an atomic layer deposition (ALD) process are used to create sub-10 nm scale gaps between Au nanopillars. Since the ALD process is a conformal coating process, a uniform aluminum oxide (Al2O3) layer with nanometer-scale thickness can be achieved. By sequentially electroplating another Au thin film to fill the spaces between Al2O3 and Au, a close-packed Au-Al2O3-Au structure with nano-scale Al2O3 gaps can be fabricated. The size of the nano-gaps can be well defined by precisely controlling the deposition cycles of the ALD process, which has an accuracy of 0.1 nm.

A protocol for the design and fabrication of a novel nanopillar-based split ring resonator (SRR) is presented.

基于纳米柱裂环谐振器的研制为位移电流共振介导太赫兹超材料

Terahertz (THz) split ring resonator (SRR) metamaterials (MMs) has been studied for gas, chemical, and biomolecular sensing applications because the SRR ...