Name: fabrication of silica ultra high quality factor microresonators
Uploaded: 2012-07-02T08:04:00
Description: Watch this Scientific Journal Video about Fabrication of Silica Ultra High Quality Factor Microresonators at JoVE.com

A. Maker ble støttet av en Annenberg Foundation Graduate Research Fellowship, og dette arbeidet ble støttet av National Science Foundation [085281 og 1028440].

1. Mikrosfære Fabrication <ol><li> Velg en liten mengde (ca 5 inches) av optisk fiber, strip ~ 1,5 &quot;hulrommet fra ene enden og rengjør med enten metanol eller etanol (Figur 1a, b). </li><li> Hvis tilgjengelig, hold enden med en optisk fiber cleaver. Hvis ikke tilgjengelig, kuttet med wire cutters eller sakser slik at ~ 0,5 &quot;som er igjen. Fordelen med å bruke en optisk fiber cleaver er at den produserer en svært jevn, ensartet snitt som i Figur 1b. Overdreven ruhet eller ...

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	<li>Armani, D. K., Kippenberg, T. J., Spillane, S. M., Vahala, K. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultra-high-Q+toroid+microcavity+on+a+chip.">Ultra-high-Q toroid microcavity on a chip.</a> Nature. 421, 925-928 (2003).</li><li>Gorodetsky, M. L., Savchenkov, A. A., Ilchenko, V. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultimate+Q+of+optical+microsphere+resonators.">Ultimate Q of optical microsphere resonators.</a> Optics Letters. 21, 453-455 (1996).</li><li>Armani, A. M., Kulkarni, R. P., Fraser, S. E., Flagan, R. C., Vahala, K. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Label-Free,+Single-Molecule+Detection+with+Optical+Microcavities.">Label-Free, Single-Molecule Detection with Optical Microcavities.</a> Science. 317, 783 (2007).</li><li>Choi, H. S., Ismail, S., Armani, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Studying+polymer+thin+films+with+hybrid+optical+microcavities.">Studying polymer thin films with hybrid optical microcavities.</a> Optics Letters. 36, 2152-2154 (2011).</li><li>Aoki, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Observation+of+strong+coupling+between+one+atom+and+a+monolithic+microresonator.">Observation of strong coupling between one atom and a monolithic microresonator.</a> Nature. 443, 671-674 (2006).</li><li>Hsu, H. -. S., Cai, C., Armani, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultra-low+threshold+Er:Yb+sol-gel+microlaser+on+silicon.">Ultra-low threshold Er:Yb sol-gel microlaser on silicon.</a> Optics Express. 17, 23265 (2009).</li><li>Zhu, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=On-chip+single+nanoparticle+detection+and+sizing+by+mode+splitting+in+an+ultrahigh-Q+microresonator.">On-chip single nanoparticle detection and sizing by mode splitting in an ultrahigh-Q microresonator.</a> Nature Photonics. 4, 46-49 (2009).</li><li>Zhang, X., Choi, H. -. S., Armani, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultimate+quality+factor+of+silica+microtoroid+resonant+cavities.">Ultimate quality factor of silica microtoroid resonant cavities.</a> Applied Physics Letters. 96, 153304 (2010).</li><li>Vernooy, D. W., Ilchenko, V. S., Mabuchi, H., Streed, E. W., Kimble, H. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-Q+measurements+of+fused-silica+microspheres+in+the+near+infrared.">High-Q measurements of fused-silica microspheres in the near infrared.</a> Optics Letters. 23, 247-249 (1998).</li><li>Saleh, B. E. A., Teich, M. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Fundamentals of Photonics. , (2007).</li><li>Ilchenko, V. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Crystal+quartz+optical+whispering-gallery+resonators.">Crystal quartz optical whispering-gallery resonators.</a> Optics Letters. 33, 1569-1571 (2008).</li><li>Soteropulos, C., Hunt, H., Armani, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Determination+of+binding+kinetics+using+whispering+gallery+mode+microcavities.">Determination of binding kinetics using whispering gallery mode microcavities.</a> Applied Physics Letters. 99, 103703 (2011).</li><li>Barclay, P. E., Srinivasan, K., Painter, O., Lev, B., Mabuchi, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Integration+of+fiber-coupled+high-Q+SiNx+microdisks+with+atom+chips.">Integration of fiber-coupled high-Q SiNx microdisks with atom chips.</a> Applied Physics Letters. 89, (2006).</li><li>Srinivasan, K., Painter, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mode+coupling+and+cavity-quantum-dot+interactions+in+a+fiber-coupled+microdisk+cavity.">Mode coupling and cavity-quantum-dot interactions in a fiber-coupled microdisk cavity.</a> Physical Review. A. 75, (2007).</li><li>Xu, Q. F., Lipson, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=All-optical+logic+based+on+silicon+micro-ring+resonators.">All-optical logic based on silicon micro-ring resonators.</a> Optics Express. 15, 924-929 (2007).</li><li>Martin, A. L., Armani, D. K., Yang, L., Vahala, K. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Replica-molded+high-Q+polymer+microresonators.">Replica-molded high-Q polymer microresonators.</a> Optics Letters. 29, 533-535 (2004).</li><li>Chao, C. Y., Guo, L. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polymer+microring+resonators+fabricated+by+nanoimprint+technique.">Polymer microring resonators fabricated by nanoimprint technique.</a> Journal of Vacuum Science Technology B. 20, 2862-2866 (2002).</li><li>Armani, A. M., Armani, D. K., Min, B., Vahala, K. J., Spillane, S. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultra-high-Q+microcavity+operation+in+H2O+and+D2O.">Ultra-high-Q microcavity operation in H2O and D2O.</a> Applied Physics Letters. 87, 151118 (2005).</li><li>Kovacs, G. T. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Micromachined Transducers Sourcebook. , (1998).</li><li>Kovacs, G. T. A., Maluf, N. I., Petersen, K. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bulk+Micromaching+of+Silicon.">Bulk Micromaching of Silicon.</a> Proceedings of the IEEE. 86, 1536-1551 (1998).</li></ol>

Som med en optisk struktur, opprettholde renslighet på hvert trinn i fabrikasjon prosessen er av avgjørende betydning. Ettersom det er mange lærebøker skrevet om temaet litografi og fabrikasjon, er forslagene nedenfor ikke ment å være fullstendig, men fremheve noen av de vanligste problemene forskerne har møtt. 19-20 Fordi Jevnheten av microtoroid periferi bestemmes av uniformitet av den første disken, er det svært viktig å mønster veldig sirkulære disker. Vanlige prob...

<table border="1"><tbody><tr><td> Navn på del </td><td> Firma </td><td> Katalognummer </td><td> Kommentarer </td></tr><tr><td> Fiber skriftlærd </td><td> Newport </td><td> F-RFS </td><td> Valgfritt </td></tr><tr><td> Optisk fiber </td><td> Newport </td><td> F-SMF-28 </td><td> Enhver type optisk fiber kan brukes. </td></tr><tr><td> Fiber belegg stripper </td><td> Newport </td><td> F-STR-175 </td><td> Wire strippere kan også brukes </td></tr><tr><td> Etanol </td><td> Enhver selger </td><td> Løsemiddel-nivå renhet </td><td> Metanol eller Isopropanol er substitutter </td></tr></tbody></table> Tabell 1. Mikrosfære Fabrikasjon Materials. <table border="1"><tbody><tr><td> Navn på reagensen </td><td> Firma </td><td> &lt;strong&gt; Katalognummer </td><td> Kommentarer </td></tr><tr><td> Silisiumskiver med 2μm termisk vokst silika </td><td> WRS Materialer </td><td> n / a </td><td> Vi bruker iboende 8, &lt;100&gt;, 4 &quot;diameter </td></tr><tr><td> HMDS (Hexamethyldisilazane) </td><td> Aldrich </td><td> 440191 </td><td></td></tr><tr><td> Fotoresist </td><td> Shipley </td><td> S1813 </td><td></td></tr><tr><td> Utvikler </td><td> Shipley </td><td> MF-321 </td><td></td></tr><tr><td> Bufret HF - Forbedret </td><td> Transene </td><td> n / a </td><td> Den forbedrede bufret HF gir en jevnere og bedre kvalitet etse enn vanlig BOE eller HF </td></tr><tr><td> Aceton, metanol, isopropanol </td><td> Enhver selger </td><td> 99,8% renhet </td><td></td></tr></tbody></table> Tabell 2. Microtoroid Fabrikasjon Materials. <table border="1"><tbody><tr><td> Utstyr Navn </td><td> Produsent </td><td> Katalognummer </td><td> Kommentarer </td></tr><tr><td> Spinner </td><td> Solitec </td><td> 5110-ND </td><td> Enhver spinner kan brukes. </td></tr><tr><td> Aligner </td><td> Suss Microtec </td><td> MJB 3 </td><td> Enhver aligner kan brukes. </td></tr><tr><td> XEF 2 etcher </td><td> Advanced Communication Devices, Inc. </td><td> # ADCETCH2007 </td><td></td></tr></tbody></table> Tabell 3. Microtoroid fabrikasjon utstyr. <table border="1"><tbody><tr><td> Navn på del </td><td> Firma </td><td> Katalognummer </td><td> Kommentarer </td></tr><tr><td> CO 2 </sub&gt; Laser </td><td> Synrad </td><td> Series 48 </td><td></td></tr><tr><td> 3-Axis scenen </td><td> OptoSigma </td><td> 120-0770 </td><td> Tilgjengelig fra andre leverandører også. </td></tr><tr><td> Si Reflektor 1 &quot;diameter) </td><td> II-VI </td><td> 308325 </td><td> Tilgjengelig fra andre leverandører også. </td></tr><tr><td> Kinematisk gimbal mount (for Si reflektor) </td><td> Thor Labs </td><td> KX1G </td><td> Tilgjengelig fra andre leverandører også. </td></tr><tr><td> Beam combiner (1 &quot;diameter) </td><td> Meller Optics </td><td> L19100008-B0 </td><td> Tilgjengelig fra andre leverandører også. </td></tr><tr><td> 4 &quot;brennvidde (1&quot; diameter) </td><td> Meller Optics eller II-VI </td><td></td><td> Tilgjengelig fra andre leverandører, så vel </td></tr><tr><td> Diverse innlegg, linse mounts </td><td> Thor Labs, Newport, Edmund Optics eller Optosigma </td><td></td><td></td></tr><tr><td> Zoom 6000 maskinsyn-system </td><td> Navitar </td><td> n / a </td><td> Krever generisk USB-kamera og datamaskin for sanntids bildebehandling. Dette er kjøpt som et kit. </td></tr><tr><td> Focuser for Zoom 6000-systemet </td><td> Edmund Optics </td><td> 54-792 </td><td> Tilgjengelig fra andre leverandører også. </td></tr><tr><td> XZ Axis posisjoneringsenheter for Zoom 6000 </td><td> Parker Daedal </td><td> CR4457, CR4452, 4499 </td><td> CR4457 er X-aksen, er CR4452 Z-aksen, er 4499 festebraketten. </td></tr></tbody></table> Tabell 4. CO 2 Laser Reflow Set-up.

fabrication of silica ultra high quality factor microresonators

Whispering gallery resonant cavities confine light in circular orbits at their periphery.1-2 The photon storage lifetime in the cavity, quantified by the quality factor (Q) of the cavity, can be in excess of 500ns for cavities with Q factors above 100 million. As a result of their low material losses, silica microcavities have demonstrated some of the longest photon lifetimes to date1-2. Since a portion of the circulating light extends outside the resonator, these devices can also be used to probe the surroundings. This interaction has enabled numerous experiments in biology, such as single molecule biodetection and antibody-antigen kinetics, as well as discoveries in other fields, such as development of ultra-low-threshold microlasers, characterization of thin films, and cavity quantum electrodynamics studies.3-7
The two primary silica resonant cavity geometries are the microsphere and the microtoroid. Both devices rely on a carbon dioxide laser reflow step to achieve their ultra-high-Q factors (Q&gt;100 million).1-2,8-9 However, there are several notable differences between the two structures. Silica microspheres are free-standing, supported by a single optical fiber, whereas silica microtoroids can be fabricated on a silicon wafer in large arrays using a combination of lithography and etching steps. These differences influence which device is optimal for a given experiment.
Here, we present detailed fabrication protocols for both types of resonant cavities. While the fabrication of microsphere resonant cavities is fairly straightforward, the fabrication of microtoroid resonant cavities requires additional specialized equipment and facilities (cleanroom). Therefore, this additional requirement may also influence which device is selected for a given experiment.
Introduction
An optical resonator efficiently confines light at specific wavelengths, known as the resonant wavelengths of the device. 1-2 The common figure of merit for these optical resonators is the quality factor or Q. This term describes the photon lifetime (&tau;o) within the resonator, which is directly related to the resonator's optical losses. Therefore, an optical resonator with a high Q factor has low optical losses, long photon lifetimes, and very low photon decay rates (1/&tau;o). As a result of the long photon lifetimes, it is possible to build-up extremely large circulating optical field intensities in these devices. This very unique property has allowed these devices to be used as laser sources and integrated biosensors.10
A unique sub-class of resonators is the whispering gallery mode optical microcavity. In these devices, the light is confined in circular orbits at the periphery. Therefore, the field is not completely confined within the device, but evanesces into the environment. Whispering gallery mode optical cavities have demonstrated some of the highest quality factors of any optical resonant cavity to date.9,11 Therefore, these devices are used throughout science and engineering, including in fundamental physics studies and in telecommunications as well as in biodetection experiments. 3-7,12
Optical microcavities can be fabricated from a wide range of materials and in a wide variety of geometries. A few examples include silica and silicon microtoroids, silicon, silicon nitride, and silica microdisks, micropillars, and silica and polymer microrings.13-17 The range in quality factor (Q) varies as dramatically as the geometry. Although both geometry and high Q are important considerations in any field, in many applications, there is far greater leverage in boosting device performance through Q enhancement. Among the numerous options detailed previously, the silica microsphere and the silica microtoroid resonator have achieved some of the highest Q factors to date.1,9 Additionally, as a result of the extremely low optical loss of silica from the visible through the near-IR, both microspheres and microtoroids are able to maintain their Q factors over a wide range of testing wavelengths.18 Finally, because silica is inherently biocompatible, it is routinely used in biodetection experiments.
In addition to high material absorption, there are several other potential loss mechanisms, including surface roughness, radiation loss, and contamination loss.2 Through an optimization of the device size, it is possible to eliminate radiation losses, which arise from poor optical field confinement within the device. Similarly, by storing a device in an appropriately clean environment, contamination of the surface can be minimized. Therefore, in addition to material loss, surface scattering is the primary loss mechanism of concern.2,8
In silica devices, surface scattering is minimized by using a laser reflow technique, which melts the silica through surface tension induced reflow. While spherical optical resonators have been studied for many years, it is only with recent advances in fabrication technologies that researchers been able to fabricate high quality silica optical toroidal microresonators (Q&gt;100 million) on a silicon substrate, thus paving the way for integration with microfluidics.1
The present series of protocols details how to fabricate both silica microsphere and microtoroid resonant cavities. While silica microsphere resonant cavities are well-established, microtoroid resonant cavities were only recently invented.1 As many of the fundamental methods used to fabricate the microsphere are also used in the more complex microtoroid fabrication procedure, by including both in a single protocol it will enable researchers to more easily trouble-shoot their experiments.

Watch this Scientific Journal Video about Fabrication of Silica Ultra High Quality Factor Microresonators at JoVE.com

Fabrication of Silica Ultra High Quality Factor Microresonators

Vi beskriver bruk av en karbondioksid laser reflow teknikk for å dikte silika resonant hulrom, inkludert frittstående mikrosfærer og on-chip microtoroids. Den reflow metoden fjerner overflate ufullkommenhet, slik at lange foton levetid innenfor begge enhetene. De resulterende enheter har Ultra High Quality faktorer, slik at applikasjoner som spenner fra telekommunikasjon til Biodetection.

Fabrikasjon av Silica Ultra High Quality Factor Microresonators

Whispering gallery resonant cavities confine light in circular orbits at their periphery.1-2 The photon storage lifetime in the cavity, quantified by the ...

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