Optical kev sib txuas lus band, ultra-nyias optical resonator

Optical kev sib txuas lus band, ultra-nyias optical resonator
Optical resonators tuaj yeem txheeb xyuas cov wavelengths tshwj xeeb ntawm lub teeb nthwv dej hauv qhov chaw txwv, thiab muaj cov ntawv thov tseem ceeb hauv kev sib cuam tshuam lub teeb,optical kev sib txuas lus, optical sensing, thiab optical integration. Qhov loj ntawm lub resonator feem ntau yog nyob ntawm cov yam ntxwv ntawm cov khoom siv thiab kev ua haujlwm wavelength, piv txwv li, silicon resonators ua haujlwm nyob rau hauv qhov ze infrared band feem ntau xav tau cov qauv kho qhov muag ntawm ntau pua nanometers thiab saum toj no. Nyob rau hauv xyoo tas los no, ultra-thin planar optical resonators tau nyiam ntau yam vim lawv cov peev xwm siv hauv cov xim xim, holographic duab, teeb pom kev zoo thiab cov khoom siv optoelectronic. Yuav ua li cas txo cov thickness ntawm planar resonators yog ib qho teeb meem nyuaj uas cov kws tshawb fawb ntsib.
Sib txawv ntawm cov khoom siv semiconductor ib txwm muaj, 3D topological insulators (xws li bismuth telluride, antimony telluride, bismuth selenide, thiab lwm yam) yog cov ntaub ntawv tshiab nrog cov hlau tiv thaiv topologically tiv thaiv lub xeev thiab lub xeev insulator. Lub xeev saum npoo yog tiv thaiv los ntawm symmetry ntawm lub sij hawm inversion, thiab nws cov electrons tsis tawg los ntawm non-magnetic impurities, uas muaj ib tug tseem ceeb daim ntawv thov prospects nyob rau hauv tsawg-power quantum xam thiab spintronic li. Nyob rau tib lub sijhawm, cov ntaub ntawv topological insulator kuj qhia cov khoom siv kho qhov muag zoo heev, xws li siab refractive index, loj nonlinear.kho qhov muagcoefficient, dav ua hauj lwm spectrum ntau yam, tunability, yooj yim kev koom ua ke, thiab lwm yam, uas muab ib tug tshiab platform rau lub realization ntawm lub teeb kev tswj thiabcov khoom siv optoelectronic.
Ib pab neeg tshawb fawb hauv Suav teb tau npaj ib txoj hauv kev rau kev tsim cov khoom siv ultra-thin optical resonators los ntawm kev siv thaj chaw loj hlob bismuth telluride topological insulator nanofilms. Optical kab noj hniav qhia pom tseeb resonance absorption yam ntxwv nyob ze infrared band. Bismuth telluride muaj qhov ntsuas kub siab heev ntawm ntau dua 6 hauv qhov kev sib txuas lus kho qhov muag (siab dua qhov ntsuas qhov ntsuas ntawm cov khoom siv siab refractive index xws li silicon thiab germanium), yog li cov kab noj hniav tuab tuaj yeem ncav cuag ib-twentieth ntawm lub resonance. wavelength. Nyob rau tib lub sijhawm, optical resonator yog tso rau ntawm ib lub ntsej muag photonic siv lead ua, thiab cov nyhuv tshiab ntawm electromagnetically induced transparency yog pom nyob rau hauv lub optical kev sib txuas lus band, uas yog vim lub coupling ntawm lub resonator nrog lub Tamm plasmon thiab nws puas cuam tshuam. . Cov lus teb spectral ntawm cov nyhuv no yog nyob ntawm qhov tuab ntawm optical resonator thiab muaj zog rau qhov kev hloov pauv ntawm qhov ntsuas qhov ntsuas qhov ntsuas qhov nruab nrab. Qhov kev ua haujlwm no qhib txoj hauv kev tshiab rau kev ua tiav ntawm ultrathin optical kab noj hniav, topological insulator khoom spectrum kev tswj thiab optoelectronic li.
Raws li qhia hauv FIG. 1a thiab 1b, optical resonator feem ntau yog tsim los ntawm bismuth telluride topological insulator thiab nyiaj nanofilms. Cov bismuth telluride nanofilms npaj los ntawm magnetron sputtering muaj thaj tsam loj thiab zoo flatness. Thaum lub thickness ntawm cov bismuth telluride thiab nyiaj films yog 42 nm thiab 30 nm, raws li, qhov kho qhov muag kab noj hniav muaj zog resonance absorption nyob rau hauv lub band ntawm 1100 ~ 1800 nm (Daim duab 1c). Thaum cov kws tshawb fawb tau muab cov kab noj hniav kho qhov muag mus rau lub photonic siv lead ua los ntawm alternating stacks ntawm Ta2O5 (182 nm) thiab SiO2 (260 nm) khaubncaws sab nraud povtseg (Daim duab 1e), ib tug txawv absorption hav (Daim duab 1f) tshwm nyob ze ntawm thawj resonant absorption ncov (~ 1550 nm), uas zoo ib yam li electromagnetically induced transparency nyhuv uas tsim los ntawm atomic systems.

Cov khoom siv bismuth telluride yog tus cwj pwm los ntawm kev sib kis ntawm electron microscopy thiab ellipsometry. FIG. 2a-2c qhia tau hais tias kis tau tus mob electron micrographs (cov duab siab daws teeb meem) thiab xaiv cov qauv electron diffraction ntawm bismuth telluride nanofilms. Nws tuaj yeem pom los ntawm daim duab uas tau npaj bismuth telluride nanofilms yog cov ntaub ntawv polycrystalline, thiab kev loj hlob tseem ceeb yog (015) siv lead ua dav hlau. Daim duab 2d-2f qhia tau hais tias lub complex refractive index ntawm bismuth telluride ntsuas los ntawm ellipsometer thiab qhov haum ntawm lub xeev thiab lub xeev complex refractive index. Cov txiaj ntsig tau pom tias qhov extinction coefficient ntawm lub xeev saum npoo yog ntau dua qhov refractive index nyob rau hauv thaj tsam ntawm 230 ~ 1930 nm, qhia cov yam ntxwv zoo li hlau. Lub refractive index ntawm lub cev yog ntau tshaj 6 thaum lub wavelength ntau tshaj 1385 nm, uas yog ntau dua li ntawm silicon, germanium thiab lwm yam tsoos high-refractive index ntaub ntawv nyob rau hauv lub band, uas nteg lub hauv paus rau kev npaj ntawm ultra - nyias optical resonators. Cov kws tshawb fawb tau taw qhia tias qhov no yog thawj zaug tshaj tawm txog kev paub txog ntawm topological insulator planar optical kab noj hniav nrog ib tug tuab ntawm tsuas yog kaum ntawm nanometers nyob rau hauv optical kev sib txuas lus band. Tom qab ntawd, qhov nqus spectrum thiab resonance wavelength ntawm ultra-thin optical kab noj hniav tau ntsuas nrog lub thickness ntawm bismuth telluride. Thaum kawg, cov nyhuv ntawm cov yeeb yaj kiab nyiaj thickness ntawm electromagnetically induced transparency spectra nyob rau hauv bismuth telluride nanocavity / photonic siv lead ua qauv raug soj ntsuam.

Los ntawm kev npaj thaj tsam loj tiaj tiaj ntawm bismuth telluride topological insulators, thiab ua kom zoo dua ntawm ultra-high refractive Performance index ntawm Bismuth telluride cov ntaub ntawv nyob ze infrared band, ib tug planar optical kab noj hniav nrog ib tug tuab ntawm tsuas yog kaum ntawm nanometers yog tau. Lub ultra-thin optical kab noj hniav tuaj yeem paub qhov ua tau zoo ntawm lub teeb pom kev zoo nyob rau hauv qhov ze infrared band, thiab muaj cov txiaj ntsig tseem ceeb hauv kev tsim cov khoom siv optoelectronic hauv kev sib txuas lus kho qhov muag. Lub thickness ntawm bismuth telluride optical kab noj hniav yog linear rau lub resonant wavelength, thiab yog me dua li ntawm silicon thiab germanium optical kab noj hniav. Nyob rau tib lub sijhawm, bismuth telluride optical kab noj hniav yog kev koom ua ke nrog photonic siv lead ua kom ua tiav cov txiaj ntsig kho qhov muag tsis zoo zoo ib yam li electromagnetically induced transparency ntawm atomic system, uas muab ib txoj hauv kev tshiab rau kev tswj hwm spectrum ntawm microstructure. Txoj kev tshawb no ua lub luag haujlwm tseem ceeb hauv kev txhawb nqa kev tshawb fawb ntawm cov ntaub ntawv topological insulator hauv kev tswj lub teeb thiab cov khoom siv kho qhov muag.