Ibhendi yonxibelelwano lwe-Optical, i-resonator ye-optical ebhityileyo kakhulu

Ibhendi yonxibelelwano lwe-Optical, i-resonator ye-optical ebhityileyo kakhulu
Ii-resonators ze-optical ziyakwazi ukufumana ubude be-wavelengths ezithile zamaza okukhanya kwindawo encinci, kwaye zinezicelo ezibalulekileyo ekusebenzisaneni kwezinto ezikhanyayo,unxibelelwano lwe-optical, ukubona okubonakalayo, kunye nokuhlanganiswa kokukhanya. Ubungakanani be-resonator buxhomekeke kakhulu kwiimpawu zezinto kunye nobude bomda wokusebenza, umzekelo, ii-resonator ze-silicon ezisebenza kwi-infrared band zihlala zifuna izakhiwo ze-optical ezingamakhulu ee-nanometer nangaphezulu. Kwiminyaka yakutshanje, ii-resonator ze-optical ze-planar ezibhityileyo kakhulu ziye zatsala ingqalelo enkulu ngenxa yezicelo zazo ezinokubakho kumbala wesakhiwo, imifanekiso ye-holographic, ulawulo lwentsimi yokukhanya kunye nezixhobo ze-optoelectronic. Indlela yokunciphisa ubukhulu bee-resonator ze-planar yenye yeengxaki ezinzima ezijongene nabaphandi.
Ngokungafaniyo nezinto ze-semiconductor zemveli, ii-insulator ze-topological ze-3D (ezifana ne-bismuth telluride, i-antimony telluride, i-bismuth selenide, njl.njl.) zizinto ezintsha zolwazi ezineemeko zomphezulu wesinyithi ezikhuselweyo ngokwe-topological kunye neemeko zokukhusela. Imeko yomphezulu ikhuselwe lulungelelwaniso lokuguqulwa kwexesha, kwaye ii-electron zayo azisasazwanga bukungcola okungekho magnethi, okunezibonelelo ezibalulekileyo zokusetyenziswa kwi-quantum computing enamandla aphantsi kunye nezixhobo ze-spintronic. Kwangaxeshanye, izixhobo zokukhusela ze-topological nazo zibonisa iipropati ezintle zokukhanya, ezifana ne-refractive index ephezulu, i-nonlinear enkulu.i-opticali-coefficient, uluhlu olubanzi lwe-spectrum yokusebenza, ukulungiswa, ukuhlanganiswa okulula, njl.njl., okubonelela ngeqonga elitsha lokufezekisa ulawulo lokukhanya kunyeizixhobo ze-optoelectronic.
Iqela lophando eTshayina licebise indlela yokwenza ii-resonators ze-optical ezibhityileyo kakhulu ngokusebenzisa ii-nanofilms ze-insulator ze-bismuth telluride topological ezikhulayo kwindawo enkulu. I-optical cavity ibonisa iimpawu ezicacileyo zokufunxwa kwe-resonance kwi-infrared band ekufutshane. I-Bismuth telluride ine-refractive index ephezulu kakhulu engaphezulu kwe-6 kwi-optical communication band (ephezulu kune-refractive index yezinto zendabuko ze-refractive index ezifana ne-silicon kunye ne-germanium), ukuze ubukhulu be-optical cavity bufikelele kwi-1-20th ye-resonance wavelength. Kwangaxeshanye, i-optical resonator ifakwa kwi-one-dimensional photonic crystal, kwaye i-electromagnetically induced transparency effect entsha ibonwa kwi-optical communication band, ebangelwa kukudibana kwe-resonator ne-Tamm plasmon kunye nokuphazamiseka kwayo okubhubhisayo. Impendulo ye-spectral yale mpembelelo ixhomekeke kubukhulu be-optical resonator kwaye inamandla ekutshintsheni kwe-ambient refractive index. Lo msebenzi uvula indlela entsha yokufezekisa i-ultrathin optical cavity, i-topological insulator material spectrum regulation kunye nezixhobo ze-optoelectronic.
Njengoko kubonisiwe kwiFIG. 1a kunye ne-1b, i-optical resonator yenziwe kakhulu yi-bismuth telluride topological insulator kunye ne-silver nanofilms. Ii-bismuth telluride nanofilms ezilungiselelwe yi-magnetron sputtering zinendawo enkulu kunye nokuqina okuhle. Xa ubukhulu beefilimu ze-bismuth telluride kunye nesilivere buyi-42 nm kunye ne-30 nm, ngokulandelanayo, i-optical cavity ibonisa ukufunxwa okunamandla kwi-band ye-1100 ~ 1800 nm (Umfanekiso 1c). Xa abaphandi badibanisa le cavity ye-optical kwi-crystal ye-photonic eyenziwe ngee-stacks ezitshintshanayo ze-Ta2O5 (182 nm) kunye ne-SiO2 (260 nm) layers (Umfanekiso 1e), intlambo eyahlukileyo yokufunxwa (Umfanekiso 1f) yabonakala kufutshane ne-resonant absorption peak yokuqala (~1550 nm), efana ne-electromagnetically induced transparency effect eveliswa ziinkqubo ze-athomu.

Izinto ze-bismuth telluride zaziphawulwa nge-transmission electron microscopy kunye ne-ellipsometry. UMfanekiso 2a-2c ubonisa ii-transmission electron micrographs (imifanekiso enesisombululo esiphezulu) kunye neepateni ze-electron diffraction ezikhethiweyo ze-bismuth telluride nanofilms. Kunokubonwa kumfanekiso ukuba ii-bismuth telluride nanofilms ezilungisiweyo zizinto ze-polycrystalline, kwaye indlela eyintloko yokukhula yi-(015) crystal plane. UMfanekiso 2d-2f ubonisa i-complex refractive index ye-bismuth telluride elinganiswe yi-ellipsometer kunye ne-fitted surface state and state complex refractive index. Iziphumo zibonisa ukuba i-extinction coefficient ye-surface state inkulu kune-refractive index kuluhlu lwe-230 ~ 1930 nm, ebonisa iimpawu ezifana nesinyithi. Isalathisi sokuqaqamba komzimba singaphezulu kwe-6 xa ubude bomda bungaphezulu kwe-1385 nm, nto leyo iphezulu kakhulu kuneye-silicon, i-germanium kunye nezinye izinto zendabuko zesalathisi esiphezulu sokuqaqamba kwesi sixhobo, esibeka isiseko sokulungiselela ii-resonators ze-optical ezibhityileyo kakhulu. Abaphandi bathi le yindlela yokuqala exeliweyo yokwenziwa kwe-topological insulator planar optical cavity enobukhulu obuzii-nanometers ezilishumi kuphela kwi-optical communication band. Emva koko, i-absorption spectrum kunye ne-resonance wavelength ye-ultra-thin optical cavity zalinganiswa ngobukhulu be-bismuth telluride. Ekugqibeleni, isiphumo sobukhulu befilimu yesilivere kwi-electromagnetically induced transparency spectra kwizakhiwo ze-bismuth telluride nanocavity/photonic crystal siyaphandwa.

Ngokulungiselela iifilimu ezithe tyaba ezibhityileyo ze-bismuth telluride topological insulators, kunye nokusebenzisa i-ultra-high refractive index yezinto ze-Bismuth telluride kwi-infrared band ekufutshane, kufunyanwa i-planar optical cavity enobukhulu obungama-nanometer alishumi kuphela. I-ultra-thin optical cavity inokufezekisa ukufunxwa kokukhanya okubonakalayo kwi-near infrared band, kwaye inexabiso elibalulekileyo lokusetyenziswa kuphuhliso lwezixhobo ze-optoelectronic kwi-optical communication band. Ubukhulu be-bismuth telluride optical cavity buhambelana ne-resonant wavelength, kwaye buncinci kunobo be-silicon kunye ne-germanium optical cavity efanayo. Kwangaxeshanye, i-bismuth telluride optical cavity idityaniswe ne-photonic crystal ukufezekisa isiphumo se-optical esingaqhelekanga esifana nokucaca okubangelwa yi-electromagnetically kwe-atomic system, ebonelela ngendlela entsha yokulawula i-spectrum ye-microstructure. Olu phononongo ludlala indima ethile ekukhuthazeni uphando lwezinto ze-topological insulator kulawulo lokukhanya kunye nezixhobo ezisebenzayo ze-optical.