Name: development of whispering gallery mode polymeric micro-optical electric field sensors
Uploaded: 2013-01-29T13:00:00
Description: Watch this Scientific Journal Video about Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors at JoVE.com

Denne forskning er sponsoreret af det amerikanske Defense Advanced Research Projects Agency under Centers i Integrated Photonics Engineering Research (Cipher) program med Dr. J. Scott Rodgers som projektleder. Oplysningerne i denne rapport afspejler ikke nødvendigvis den holdning eller politik den amerikanske regering og nogen officiel godkendelse skal udledes heraf.

1. PDMS mikrosfærepræparationen (Sphere I) <ol><li> Polydimethylsiloxan (PDMS) base og hærdemidlet blandes med et volumenforhold på 60:1. </li><li> En streng af optisk silicafiber, cirka 2 cm lang, først fjernet sin plast beklædning anvendelse af en optisk stripper. </li><li> Den ene ende af fiberen er opvarmet og strakt til at tilvejebringe en stilk ende, der er ~ 25-50 um i diameter ved spidsen. </li><li> Den strakte ende af fiberen er neddykket i PDMS blandingen ved en længde på 2-4 mm og derefter trækkes ...

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Kuglerne er oprindeligt polariseret ved at forbinde elektroderne til en DC højspændingsforsyning. Ved afslutningen af polarisationsfeltet varighed, er elektroderne afbrydes fra jævnstrømsforsyning og forbundet til en funktionsgenerator som vist i figur 4. Resultaterne præsenteret i figur 5 til 8 viser, at positive og negative elektriske felter (i forhold til retningen af poling) fører til kugle forlængelse og komprimering hhv. Sfære I, som er et enkelt lag 60:1 ...

<table border="1"><tbody><tr><td></td><td> Firma </td><td> Katalognummer </td><td> Kommentarer (valgfrit) </td></tr><tr><td> PDMS </td><td> Dow Corning </td><td> Sylgard 184 </td><td></td></tr><tr><td> Silicafiber </td><td> Fiber Instrument Sales </td><td> E-37AP15-FIS </td><td></td></tr><tr><td> Bariumtitanat (BaTiO 3) nanopartikler </td><td> Sigma Aldrich </td><td> 467.634-100G </td><td></td></tr><tr><td> Laser Controller </td><td> ILX Lightwave </td><td> LDC-3724B </td><td></td></tr><tr><td> DFB-laseren </td><td> Agere </td><td> Agere 2300 </td><td> 1,310 um centrale bølgelængde </td></tr><tr><td> Photodiode </td><td> Thorlabs </td><td> PDA10CS </td><td></td></tr><tr><td> A / D-kort </td><td> National Instruments </td><td> PXI 6115 </td><td></td>
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development of whispering gallery mode polymeric micro-optical electric field sensors

Optiske former for dielektriske mikro-hulrum har fået betydelig opmærksomhed i de senere år for deres potentiale i en bred vifte af applikationer. De optiske tilstande ofte benævnt &quot;hviskegallerimodus modes&quot; (WGM) eller &quot;morfologi afhængige resonanser&quot; (MDR) og udviser høj optisk kvalitet faktorer. Nogle foreslåede anvendelser af mikro-hulrum optiske resonatorer er i spektroskopi 1, mikro-hulrum laserteknologi 2, optisk kommunikation 3-6 samt sensorteknologi. De WGM-baserede sensor applikationer omfatter dem i biologi 7, spor gasdetektion 8 og urenhed opdagelse i væsker 9. Mekaniske sensorer baseret på mikrokugle resonatorer er også blevet foreslået, herunder dem, for kraft 10,11, tryk 12, acceleration 13 og væg forskydningsspænding 14. I den foreliggende, viser vi en WGM-baseret elektrisk felt sensor, som bygger på vores tidligere studies 15,16. En kandidat anvendelsen af ​​denne sensor er i afsløring af neuronal virkningspotentiale. Det elektriske felt sensoren er baseret på polymert flerlaget dielektrisk mikrosfærer. Den eksterne elektriske felt inducerer overflade og krop kræfter på kugler (electrostriction effekt), der fører til elastisk deformation. Denne ændring i morfologien af ​​kuglerne, fører til forskydninger i WGM. Det elektriske felt-inducerede WGM skift forhørt af spændende de optiske tilstande kuglerne ved laserlys. Lys fra en fordelt tilbagekobling (DFB) laser (nominel bølgelængde på ~ 1,3 um) er side-koblet i mikrosfærerne under anvendelse af en tilspidset del af en single-mode optisk fiber. Basismaterialet af kuglerne er polydimethylsiloxan (PDMS). Tre mikrosfærepræparater geometrier anvendes: (1) PDMS kugle med et 60:1 volumetrisk forhold på bund-mod-hærdemiddel-blanding, (2) flere lag kugle med 60:1 PDMS kerne, for at forøge den dielektriske konstant af the kugle, et midterlag af 60:1 PDMS der er blandet med varierende mængder (2% til 10 volumen%) af bariumtitanat og et ydre lag af 60:1 PDMS og (3) fast silica kugle belagt med et tyndt lag af uhærdet PDMS base. I hver type sensor, er laserlys fra den tilspidsede fiber koblet til det yderste lag, der giver høj optisk kvalitet faktor WGM (Q ~ 10 6). Mikrokuglerne er polariseres i adskillige timer ved elektriske felter af ~ 1 MV / m for at forøge deres følsomhed over for elektrisk felt.

En optisk tilstand (WGM) af kuglen er begejstret af laser lys, når lysvej tilbagelagt af lyset er et multiplum heltal af laser bølgelængde. For arrangementet vist i figur 3, er den optiske vejlængde 2πrn, hvor n og r er brydningsindekset og kuglens radius hhv. Ved hjælp af geometriske optik tilnærmelse, er en WGM betingelse opfyldt, når 2πrn = lλ hvor l er et helt tal, og λ er laserens bølgelængde. Da DFB-laseren indstilles på ...

Watch this Scientific Journal Video about Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors at JoVE.com

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

En høj følsomhed fotoniske mikro sensor blev udviklet til elektrisk felt detektering. Sensoren udnytter optiske former for et dielektrisk område. Ændringer i den ydre elektrisk felt forstyrrer sfære morfologi, der fører til forskydninger i dets optiske tilstande. Den elektriske feltstyrke måles ved overvågning af disse optiske forskydninger.

Udvikling af Whispering Gallery mode Polymere Micro-optiske elektrisk felt-følere

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

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