Gulu lolumikizirana la Optical, Ultra-thin Optical resonator

Gulu lolumikizirana la Optical, Ultra-thin Optical resonator
Ma resonator a Optical amatha kuyika kutalika kwa mafunde owala pamalo ochepa, ndikukhala ndi ntchito zofunika pakulumikizana ndi zinthu zopepuka,kulumikizana kwamaso, optical sensing, ndi kuphatikiza kwa kuwala. Kukula kwa resonator makamaka kumadalira mawonekedwe azinthu ndi kutalika kwa mawonekedwe ogwirira ntchito, mwachitsanzo, ma silicon resonator omwe amagwira ntchito pafupi ndi infrared band nthawi zambiri amafunikira mawonekedwe owoneka a mazana a nanometer ndi kupitilira apo. M'zaka zaposachedwa, ma ultra-thin planar optical resonators akopa chidwi kwambiri chifukwa cha momwe angagwiritsire ntchito mawonekedwe amtundu wamapangidwe, kujambula kwa holographic, kuwongolera malo opepuka ndi zida za optoelectronic. Momwe mungachepetsere makulidwe a resonator planar ndi imodzi mwazovuta zomwe ofufuza amakumana nazo.
Zosiyana ndi zida zachikhalidwe za semiconductor, 3D topological insulators (monga bismuth telluride, antimony telluride, bismuth selenide, etc.) ndi zida zatsopano zokhala ndi zitsulo zotetezedwa ndi topologically ndi mayiko osungira. Dziko lapansi limatetezedwa ndi kusinthasintha kwa nthawi, ndipo ma elekitironi ake samamwazikana ndi zonyansa zopanda maginito, zomwe zimakhala ndi chiyembekezo chofunikira pakugwiritsa ntchito mphamvu zochepa zamakompyuta ndi zida za spintronic. Nthawi yomweyo, zida za topological insulator zikuwonetsanso zinthu zabwino kwambiri zowoneka bwino, monga index yayikulu ya refractive, yayikulu yopanda mzere.kuwalacoefficient, wide working spectrum range, tunability, kuphatikizika kosavuta, ndi zina zotero, zomwe zimapereka nsanja yatsopano yokwaniritsira malamulo a kuwala ndizida za optoelectronic.
Gulu lina lochita kafukufuku ku China lakonza njira yopangira makina opangira magetsi owoneka bwino kwambiri pogwiritsa ntchito ma nanofilms okhala ndi bismuth telluride topological insulator. Mphuno ya kuwala imawonetsa mawonekedwe owoneka bwino a resonance pafupi ndi bandi ya infrared. Bismuth telluride ili ndi cholozera chapamwamba kwambiri chopitilira 6 mu bandi yolumikizirana (yokwera kuposa cholozera cha refractive cha zida zamtundu wapamwamba monga silicon ndi germanium), kotero kuti makulidwe amtundu wa optical amatha kufikira gawo limodzi mwa magawo makumi awiri a resonance. kutalika kwa mafunde. Panthawi imodzimodziyo, resonator ya kuwala imayikidwa pamtundu umodzi wa kristalo wa photonic, ndipo buku lodziwika bwino lamagetsi lamagetsi likuwoneka mu gulu la optical communication, lomwe liri chifukwa cha kugwirizana kwa resonator ndi Tamm plasmon ndi kusokoneza kwake kowononga. . Mayankho owoneka bwino amtunduwu amadalira makulidwe a resonator owoneka bwino ndipo ndiolimba pakusintha kwa index yozungulira yozungulira. Ntchitoyi imatsegula njira yatsopano yokwaniritsira ultrathin optical cavity, topological insulator material regulation ndi optoelectronic zipangizo.
Monga zikuwonetsedwa mu FIG. 1a ndi 1b, chowotchera kuwala chimapangidwa makamaka ndi bismuth telluride topological insulator ndi nanofilms zasiliva. Ma bismuth telluride nanofilms okonzedwa ndi magnetron sputtering ali ndi malo akuluakulu komanso osalala bwino. Pamene makulidwe a bismuth telluride ndi mafilimu a siliva ndi 42 nm ndi 30 nm, motero, phokoso la kuwala likuwonetsa kuyamwa kwamphamvu mu gulu la 1100 ~ 1800 nm (Chithunzi 1c). Ofufuza ataphatikiza kabowo kakang'ono kameneka pagalasi la photonic lopangidwa ndi masinthidwe osinthika a zigawo za Ta2O5 (182 nm) ndi SiO2 (260 nm) (Chithunzi 1e), chigwa chodziwika bwino (Chithunzi 1f) chinawonekera pafupi ndi nsonga yoyambira yoyamwa (~ 1550 nm), yomwe ndi yofanana ndi mawonekedwe owonekera a electromagnetic opangidwa ndi ma atomiki.

Zinthu za bismuth telluride zidadziwika ndi ma electron microscopy ndi ellipsometry. CHITH. 2a-2c ikuwonetsa ma electron micrographs (zithunzi zowoneka bwino) ndi ma electron diffraction mapatani a bismuth telluride nanofilms. Zitha kuwoneka kuchokera pachithunzichi kuti bismuth telluride nanofilms yokonzekera ndi zipangizo za polycrystalline, ndipo kukula kwakukulu ndi (015) ndege ya crystal. Chithunzi 2d-2f chikuwonetsa zovuta za refractive index ya bismuth telluride yoyezedwa ndi ellipsometer ndi fitted surface state and state complex refractive index. Zotsatira zikuwonetsa kuti chiwopsezo cha kutha kwa dziko lapansi ndi chachikulu kuposa cholozera cha refractive mumitundu ya 230 ~ 1930 nm, kuwonetsa mawonekedwe achitsulo. The refractive index of the body is more than 6 wavelength is wamkulu kuposa 1385 nm, yomwe ndi yokwera kwambiri kuposa ya silicon, germanium ndi zida zina zachikhalidwe zamtundu wapamwamba kwambiri mu gulu ili, zomwe zimayika maziko akukonzekera kopitilira muyeso. -opyapyala opangira kuwala. Ofufuzawa akuwonetsa kuti aka ndi koyamba kuzindikirika kwa malo owoneka bwino a topological insulator planar optical cavity yokhala ndi makumi a nanometer mu bandi yolumikizirana. Kenako, mayamwidwe sipekitiramu ndi resonance wavelength wa ultra-thin Optical pabowo anayesedwa ndi makulidwe a bismuth telluride. Pomaliza, zotsatira za makulidwe a filimu ya siliva pamawonekedwe a electromagnetic induced transparency spectra mu bismuth telluride nanocavity/photonic crystal structures amafufuzidwa.

Pokonzekera filimu yopyapyala yopyapyala ya bismuth telluride topological insulators, ndikugwiritsa ntchito mwayi wopitilira muyeso wokwera kwambiri wa zinthu za Bismuth telluride pafupi ndi bandi ya infuraredi, kabowo kakang'ono kokhala ndi makulidwe a ma nanometers makumi khumi okha. Pang'onopang'ono-woonda kwambiri wowoneka bwino amatha kuzindikira kuyamwa bwino kwa kuwala kowoneka bwino mu bandi yapafupi ya infuraredi, ndipo imakhala ndi phindu lofunikira pakupanga zida za optoelectronic mu bandi yolumikizirana yolumikizana. Kukhuthala kwa bismuth telluride optical cavity ndi mzere ku resonant wavelength, ndipo ndi yaying'ono kuposa ya silicon ndi germanium optical cavity. Pa nthawi yomweyo, bismuth telluride kuwala patsekeke Integrated ndi photonic crystal kukwaniritsa anomalous kuwala zotsatira zofanana ndi electromagnetically kuchititsa transparency ya atomiki dongosolo, amene amapereka njira yatsopano kwa sipekitiramu malamulo a microstructure. Kafukufukuyu amatenga gawo lina popititsa patsogolo kafukufuku wa zida za topological insulator pakuwongolera kuwala ndi zida zowoneka bwino.