Ma micro-nano photonics makamaka amaphunzira lamulo la kuyanjana pakati pa kuwala ndi chinthu pamlingo wa micro ndi nano komanso momwe amagwiritsidwira ntchito popanga kuwala, kutumiza, kulamulira, kuzindikira ndi kuzindikira. Zipangizo za micro-nano photonics sub-wavelength zimatha kusintha bwino kuchuluka kwa kuphatikiza kwa photon, ndipo zikuyembekezeka kuphatikiza zida za photonic mu chip yaying'ono yowunikira monga ma chips amagetsi. Ma plasmonics a nano-surface ndi gawo latsopano la ma micro-nano photonics, lomwe makamaka limaphunzira kuyanjana pakati pa kuwala ndi chinthu mu nanostructures zachitsulo. Lili ndi makhalidwe a kukula kochepa, liwiro lalikulu komanso kugonjetsa malire achikhalidwe a diffraction. Kapangidwe ka Nanoplasma-waveguide, komwe kali ndi mawonekedwe abwino okulitsa munda ndi kusefa kwa resonance, ndiye maziko a nano-filter, wavelength division multiplexer, optical switch, laser ndi zida zina za micro-nano optical. Ma microcavities a Optical amaletsa kuwala kumadera ang'onoang'ono ndipo amawonjezera kwambiri kuyanjana pakati pa kuwala ndi chinthu. Chifukwa chake, microcavity ya optical yokhala ndi chinthu chapamwamba kwambiri ndi njira yofunika kwambiri yodziwira komanso kuzindikira kukhudzidwa kwakukulu.
WGM microcavity
M'zaka zaposachedwapa, kuwala kwa microcavity kwakopa chidwi chachikulu chifukwa cha kuthekera kwake kogwiritsa ntchito bwino komanso kufunika kwa sayansi. Kuwala kwa microcavity makamaka kumakhala ndi microsphere, microcolumn, microring ndi geometries zina. Ndi mtundu wa resonator yodalira mawonekedwe a modological. Mafunde owala mu microcavities amawonetsedwa mokwanira pa mawonekedwe a microcavity, zomwe zimapangitsa kuti pakhale mawonekedwe otchedwa whispering gallery mode (WGM). Poyerekeza ndi ma optical resonators ena, ma microresonators ali ndi makhalidwe a Q value yapamwamba (yoposa 106), low mode voliyumu, kukula kochepa komanso kuphatikiza kosavuta, ndi zina zotero, ndipo agwiritsidwa ntchito pozindikira biochemical, ultra-low threshold laser ndi nonlinear action. Cholinga chathu chofufuzira ndikupeza ndikuphunzira makhalidwe a kapangidwe kosiyana ndi mawonekedwe osiyanasiyana a microcavities, ndikugwiritsa ntchito makhalidwe atsopanowa. Malangizo akuluakulu ofufuza akuphatikizapo: kafukufuku wa mawonekedwe a WGM microcavity, kafukufuku wopanga microcavity, kafukufuku wa kugwiritsa ntchito microcavity, ndi zina zotero.
Kuzindikira kwa biochemical kwa WGM microcavity
Mu kuyeseraku, njira ya WGM ya dongosolo lapamwamba ya anayi M1 (Chithunzi 1(a)) idagwiritsidwa ntchito poyesa kuzindikira. Poyerekeza ndi njira ya dongosolo lapansi, kukhudzidwa kwa njira ya dongosolo lapamwamba kunakula kwambiri (Chithunzi 1(b)).
Chithunzi 1. Resonance mode (a) ya microcapillary cavity ndi refractive index sensitivity yake yofanana (b)
Fyuluta yowunikira yosinthika yokhala ndi mtengo wapamwamba wa Q
Choyamba, microcavity ya cylindrical yomwe imasintha pang'onopang'ono imachotsedwa, kenako kusintha kwa mafunde kumatha kuchitika mwa kusuntha malo olumikizirana pogwiritsa ntchito makina kutengera kukula kwa mawonekedwe kuyambira mafunde a resonant (Chithunzi 2 (a)). Mphamvu yosinthika komanso bandwidth yosefera zikuwonetsedwa mu Chithunzi 2 (b) ndi (c). Kuphatikiza apo, chipangizochi chimatha kuzindikira kusunthika kwa kuwala ndi kulondola kwa sub-nanometer.
Chithunzi 2. Chithunzi chojambulidwa cha fyuluta yowunikira yosinthika (a), magwiridwe antchito osinthika (b) ndi bandwidth ya fyuluta (c)
WGM microfluidic drop resonator
Mu microfluidic chip, makamaka ya dontho mu mafuta (droplet in-oil), chifukwa cha makhalidwe a pamwamba pa madzi, chifukwa cha kukula kwa ma microns makumi kapena mazana ambiri, idzapachikidwa mu mafuta, ndikupanga bwalo langwiro. Kudzera mu kukonza kwa refractive index, dontho lokha ndi lozungulira bwino lomwe lili ndi mphamvu yoposa 108. Limapewanso vuto la evaporation mu mafuta. Pa madontho akuluakulu, "adzakhala" pamakoma akumtunda kapena pansi chifukwa cha kusiyana kwa kuchuluka kwa madzi. Mtundu uwu wa dontho ungagwiritse ntchito njira yotsatsira lateral yokha.
Nthawi yotumizira: Okutobala-23-2023