Ib qho cuab yeej me me uas nws yuav luag tsis pom ntawm qhov muag liab qab yuav dhau los ua tus yuam sij rau yav tom ntej optical sensing chips. Ib pab neeg tshawb fawb ntawm University of Colorado Boulder tau tsim lub siab -kev ua tau zoo "racetrack" optical microresonator uas tuaj yeem txo qis lub teeb poob, qhib qhov rooj rau cov ntawv thov xws li kev tshawb nrhiav tshuaj, cov khoom siv navigation thiab txawm tias kev ntsuas quantum. Cov ntawv tseem ceeb tau luam tawm nyob rau hauv qhov teeb meem tshiab ntawm Applied Physics Letters.
Qhov tshwm sim ntawm qhov kev tshawb fawb no yog los tsim ib qho optical waveguide microresonator ntawm lub nti. Lub thickness ntawm microresonator tsuas yog 1/10 ntawm tib neeg cov plaub hau. Lub microresonator tuaj yeem nkag siab tias yog microdevice uas "cuam tshuam lub teeb." Lub teeb circulates tsis tu ncua nyob rau hauv nws, maj accumulating siv. Thaum lub teeb muaj zog txaus, cov kws tshawb fawb tuaj yeem siv nws los ua ntau yam haujlwm tshwj xeeb kho qhov muag. Bright, thawj tus sau ntawm daim ntawv
Raws li Lu, lawv lub hom phiaj yog ua kom cov cuab yeej no ua haujlwm tau zoo ntawm lub zog kho qhov muag qis.
Pab neeg no tsom mus rau "racetrack" resonators, ib lub cuab yeej muaj npe rau nws cov duab elongated uas zoo li lub racetrack. Lawv tshwj xeeb tau txais kev tsim qauv nkhaus hu ua "Eulerian nkhaus", uas feem ntau pom ntawm txoj kev thiab kev tsheb ciav hlau, vim tias cov tsheb tsis tuaj yeem tig ntawm txoj cai kaum sab xis thaum mus ncig ntawm kev kub ceev, thiab tib yam muaj tseeb rau kev nthuav tawm lub teeb. Yog hais tias nws khoov heev sharply, nws yuav "plig".
Siv cov khoov zoo li no txo qis qhov poob ntawm qhov muag, tso cai rau photons nyob hauv lub resonator ntev dua, yog li txhim kho kev sib cuam tshuam. Yog tias muaj teeb meem ntau dhau lawm, lub resonator tsis tuaj yeem khaws lub teeb txaus thiab nws qhov kev ua tau zoo yuav raug txo kom tsawg.
Cov microresonators tau tsim los siv hluav taws xob beam lithography hauv chav huv. Tsis zoo li ib txwm photolithography, uas yog txwv los ntawm lub teeb wavelength, lub tshuab no tuaj yeem ua tiav sub-nanometer precision thiab tsim nyog rau kev ua micro- nplai kho qhov muag. Vim yog qhov me me ntawm cov cuab yeej, txawm tias cov plua plav me me lossis qhov tsis xws luag tuaj yeem cuam tshuam rau kev nthuav tawm ntawm lub teeb, yog li qhov chaw huv huv yog qhov tseem ceeb heev.
Kev xaiv cov khoom tseem ceeb sib npaug. Pab neeg no siv ib hom chalcogenide semiconductor iav khoom. Cov khoom siv no muaj cov pob tshab siab thiab muaj zog nonlinear, ua rau nws tsim nyog rau cov khoom siv photonic. Txawm li cas los xij, lawv nyuaj rau txheej txheem, yuav tsum muaj qhov sib npaug ntawm kev ua haujlwm thiab kev tsim khoom nyuaj. Los ntawm kev txo qis kev poob qis, pab pawg ua tiav tau tsim ultra- qis- cov khoom siv poob nrog kev ua tau zoo piv rau cov khoom siv qib siab tam sim no.
Pab neeg tshawb fawb tau hais tias yav tom ntej, lub microresonator no yuav tsum dhau los ua ib feem tseem ceeb hauv cov tshuab photonic thiab tuaj yeem siv rau hauv microlasers, biochemical sensors, thiab quantum network li. Lub hom phiaj ntawm qhov kawg yog los tsim cov thev naus laus zis no rau hauv cov khoom siv kho qhov muag uas tuaj yeem tsim tawm ntawm qhov loj.
