Micro-nano photonics yog dab tsi?

Micro-nano photonics tsuas yog kawm txog txoj cai ntawm kev sib cuam tshuam ntawm lub teeb thiab teeb meem ntawm micro thiab nano nplai thiab nws daim ntawv thov nyob rau hauv lub teeb tiam, kis tau tus mob, kev tswj, nrhiav kom tau thiab sensing. Micro-nano photonics sub-wavelength cov cuab yeej tuaj yeem txhim kho qib ntawm kev sib koom ua ke ntawm photon, thiab nws yuav tsum ua ke cov khoom siv photonic rau hauv cov khoom siv kho qhov muag me me xws li cov khoom siv hluav taws xob. Nano-nto plasmonics yog qhov chaw tshiab ntawm micro-nano photonics, uas feem ntau kawm txog kev cuam tshuam ntawm lub teeb thiab teeb meem hauv cov hlau nanostructures. Nws muaj cov yam ntxwv ntawm qhov me me, kev kub ceev thiab kov yeej cov kev txwv ib txwm muaj. Nanoplasma-waveguide qauv, uas muaj qhov zoo hauv cheeb tsam kev txhim kho thiab resonance filtering yam ntxwv, yog lub hauv paus ntawm nano-filter, wavelength division multiplexer, optical hloov, laser thiab lwm yam micro-nano optical li. Optical microcavities kaw lub teeb rau thaj tsam me me thiab txhim khu kev sib cuam tshuam ntawm lub teeb thiab teeb meem. Yog li ntawd, qhov kho qhov muag microcavity nrog qhov zoo tshaj plaws yog ib txoj hauv kev tseem ceeb ntawm kev hnov ​​​​mob siab thiab nrhiav kom pom.

WGM microcavity

Nyob rau hauv xyoo tas los no, optical microcavity tau nyiam ntau xim vim nws txoj kev siv tau zoo thiab qhov tseem ceeb ntawm kev tshawb fawb. Optical microcavity mas muaj microsphere, microcolumn, microring thiab lwm yam geometries. Nws yog ib hom morphologic dependent optical resonator. Lub teeb nthwv dej hauv microcavities tau pom tag nrho ntawm microcavity interface, uas ua rau lub suab nrov hu ua whispering gallery mode (WGM). Piv nrog rau lwm cov optical resonators, microresonators muaj cov yam ntxwv ntawm Q tus nqi siab (ntau dua 106), qis hom ntim, me me thiab yooj yim kev koom ua ke, thiab lwm yam, thiab tau siv rau high-rhiab heev biochemical sensing, ultra-low pib laser thiab kev ua tsis raws cai. Peb lub hom phiaj kev tshawb fawb yog nrhiav thiab kawm cov yam ntxwv ntawm cov qauv sib txawv thiab txawv morphologies ntawm microcavities, thiab siv cov yam ntxwv tshiab no. Cov lus qhia tseem ceeb ntawm kev tshawb fawb muaj xws li: kev tshawb fawb txog kev kho qhov muag ntawm WGM microcavity, kev tshawb fawb ntawm microcavity, kev tshawb fawb ntawm microcavity, thiab lwm yam.

WGM microcavity biochemical sensing

Hauv kev sim, plaub qhov kev txiav txim siab WGM hom M1(FIG. 1(a)) tau siv rau kev ntsuas ntsuas. Piv nrog rau hom kev txiav txim qis, qhov rhiab heev ntawm hom kev txiav txim siab tau zoo heev (Daim duab 1(b)).

Daim duab 1. Resonance hom (a) ntawm lub microcapillary kab noj hniav thiab nws cov coj refractive index rhiab heev (b)

Tunable optical lim nrog siab Q tus nqi

Ua ntej, lub radial maj mam hloov cylindrical microcavity yog rub tawm, thiab tom qab ntawd lub wavelength tuning tuaj yeem ua tiav los ntawm kev txav ntawm qhov sib txuas raws li lub hauv paus ntsiab lus ntawm cov duab loj txij li lub resonant wavelength (Daim duab 2 (a)). Qhov kev ua tau zoo tunable thiab filtering bandwidth yog qhia hauv daim duab 2 (b) thiab (c). Tsis tas li ntawd, lub cuab yeej tuaj yeem paub qhov kev hloov pauv ntawm qhov muag pom nrog qhov tseeb ntawm cov nanometer.

Daim duab 2. Schematic daim duab ntawm tunable optical filter (a), tunable kev ua tau zoo (b) thiab lim bandwidth (c)

WGM microfluidic nco resonator

nyob rau hauv microfluidic nti, tshwj xeeb tshaj yog rau cov tee dej hauv cov roj (tej hauv cov roj), vim yog cov yam ntxwv ntawm qhov nro, rau txoj kab uas hla ntawm kaum lossis ntau pua microns, nws yuav raug tshem tawm hauv cov roj, tsim ze li ntawm zoo meej kheej kheej. Los ntawm qhov optimization ntawm refractive index, cov tee nws tus kheej yog ib tug zoo meej spherical resonator nrog ib tug zoo tshaj plaws ntawm ntau tshaj 108. Nws kuj zam qhov teeb meem ntawm evaporation nyob rau hauv cov roj. Rau cov tee me me, lawv yuav "tso" rau ntawm phab ntsa sab sauv lossis sab qis vim qhov sib txawv ntawm qhov sib txawv. Hom tee dej no tsuas yog siv hom kev txhawb siab sab nraud xwb.