Optical waveguide microresonators tsim los ntawm xibfwb Won Park pawg ntawm University of Colorado Boulder tab tom ncaws lub qhov rooj rau tshiab ntawm -chip sensor technologies qhib dav.
Cov khoom siv kho qhov muag me me no ntxiab lub teeb ntawm -chip thiab tsim nws qhov kev siv zog-thiab lawv siab-Q yam thiab nonlinearity ua rau lawv zoo tagnrho rau cov ntawv thov xws li nqaim -linewidth lasers ntawm stimulated Brillouin thiab Raman tawg, zaus comb tiam, lossis quantum cov ntaub ntawv ua.
"Peb txaus siab tshawb nrhiav nonlinear optics nrog cov ntaub ntawv tshiab- nyob rau hauv peb rooj plaub, chalcogenides, uas paub txog lawv qhov ntev wavelength transparency, siab nonlinearity, thiab ib qho amorphous xwm uas muaj kev koom ua ke nrog rau lwm yam ntaub ntawv xws li lithium niobate thiab silicon nitride," piav qhia Park, ib tug kws kho hluav taws xob.
Euler?
Pab pawg optical waveguide microresonator tsim yog raws li Euler "U" khoov, uas tso cai rau lub teeb nyob hauv lub microresonator li ntawm 3 nanoseconds (thaum lub sij hawm 3-ns photon lub neej, lub teeb mus txog ib nrab ib meter lossis yuav luag ib txhiab ncig mus ncig). Qhov no ua rau kom txoj kev ntev ntawm cov khoom siv thiab ua rau cov kev sib cuam tshuam tsis zoo ntawm qhov muag. Nws qhov tseem ceeb muab cov kws tshawb fawb tswj xyuas qhov khoov poob hauv microresonators thiab ua rau ultralow-cov khoom siv poob zoo ib yam li lwm lub xeev- ntawm- cov khoom siv the-art platforms.
Kev simulation yog qhov tseem ceeb los txheeb xyuas tias yog vim li cas cov resonators poob ntau lub teeb. Park hais tias "Peb tau siv COMSOL Multiphysics los laij cov hom kev faib tawm thiab ua cov sib tshooj sib tshooj," Park hais. "Qhov no tau tso cai rau peb txheeb xyuas qhov chaw qab zib' ntawm qhov sib txuas uas ncaj thiab nkhaus waveguides sib ntsib. Peb kuj tau siv FDTD simulations los ua qauv li cas lub teeb propagates los ntawm Euler nkhaus kom ntseeg tau tias peb tuaj yeem cuam tshuam ntau dua -kev txiav txim hom excitation uas feem ntau plagues cov me -footprint devices."
Cov pab pawg tau tsim cov qauv rau lwm qhov kev sim thiab xav tsis thoob kom pom qhov siab -Q yam uas lawv tau rov ua dua hauv ob chav huv huv sib txawv.
"Peb lub sijhawm 'aha' tau paub tias los ntawm kev siv Euler nkhaus- qhov twg qhov curvature hloov linearly-peb tuaj yeem 'trick' lub teeb kom nyob twj ywm hauv hom tseem ceeb txawm tias muaj kev khoov nruj heev," Park hais. "Nws tau txais txiaj ntsig zoo kawg uas tau pom peb qhov kev sim ua tau zoo sib xws rau qhov theoretical intrinsic quality factor of 4.55 × 106. Ua tiav qhov siab tshaj plaws uas tsis yog-linear daim duab ntawm kev tsim nyog tau tshaj tawm rau chalcogenide PICs yog cherry nyob rau sab saum toj. "
Lithography kev sib tw
Yuav kom mus txog qhov ntawd, pawg thawj coj yuav tsum tau tsim cov txheej txheem electron beam lithographic qauv rau lawv cov khoom siv, vim lithography lithography uas siv photons raug txwv los ntawm lub teeb ntawm lub teeb.
Lub ntsiab teeb meem cuam tshuam? Khoom rhiab heev. "Chalcogenides tuaj yeem raug kev txom nyem los ntawm oxidation saum npoo thiab impurity- cuam tshuam txog kev nqus," Park hais. "Nyob rau hauv kev siv zog coj los ntawm ob tug kawm tiav, Bright Lu thiab James Erikson, peb kov yeej qhov no los ntawm kev siv lub tshuab nqus tsev nqus tsev vacuum ntawm 250℃los txhim kho cov khoom sib xws thiab txo qhov roughness ntawm qhov chaw.3) thiab argon (Ar) roj sib tov thaum lub sij hawm inductively ua ke plasma reactive ion etching (ICP RIE) kom ntseeg tau tias cov phab ntsa du, uas yog qhov tseem ceeb rau kev tswj 'ultrahigh-Q'kev ua tau zoo."
'Swiss tub rog riam' rau PICs
Cov resonators no zoo ib yam li "Swiss Army riam rau PICs," hais tias Park. "Vim qhov siab -Qyam thiab nonlinearity, lawv zoo meej rau ntau yam kev siv xws li nqaim -linewidth lasers los ntawm kev txhawb nqa Brillouin thiab Raman tawg, zaus comb tiam rau metrology thiab kev sib txuas lus, lossis quantum cov ntaub ntawv ua qhov twg qis - poob ntawm -chip Cheebtsam yog tsis sib tham tau.
Tam sim no hais tias Park pab pawg tau ua pov thawj lub platform qis - tsis muaj peev xwm (0.43 dB / m absorption poob), lawv tab tom pom qhov kev poob qis kawg. "Peb tseem tab tom nthuav dav cov waveguides ntxiv mus rau 'khoom- txwv' kev ua tau zoo, uas tuaj yeem cuam tshuam pebQ-cov ntsiab lus tseem ceeb dua thiab ua kom muaj txiaj ntsig zoo dua tsis muaj kev sib cuam tshuam," nws hais.
Nyeem ntxiv
