Ƙungiyar sadarwa ta gani, resonator na gani mai bakin ciki
Resonators na gani na iya gano takamaiman tsayin raƙuman raƙuman haske a cikin iyakataccen sarari, kuma suna da mahimman aikace-aikace a cikin hulɗar al'amarin haske,sadarwa na gani, Ƙwararrun gani, da haɗin kai. Girman resonator ya dogara ne akan halayen kayan aiki da tsawon tsayin aiki, alal misali, na'urorin siliki waɗanda ke aiki a cikin rukunin infrared na kusa yawanci suna buƙatar tsarin gani na ɗaruruwan nanometers da sama. A cikin 'yan shekarun nan, matsananci-bakin ciki planar resonators na gani sun ja hankali sosai saboda yuwuwar aikace-aikacen su a cikin launi tsarin, hoton holographic, tsarin filin haske da na'urorin optoelectronic. Yadda za a rage kauri na resonators na planar na ɗaya daga cikin matsalolin da masu bincike ke fuskanta.
Daban-daban da kayan aikin semiconductor na al'ada, 3D insulators na topological (kamar bismuth telluride, antimony telluride, bismuth selenide, da sauransu) sabbin kayan bayanai ne tare da jihohin saman ƙarfe da ke da kariya ta topologically da jihohin insulator. Ana kiyaye yanayin sararin samaniya ta hanyar siffa ta jujjuyawar lokaci, kuma electrons ɗinta ba su warwatse da ƙazantattun abubuwan da ba na maganadisu ba, waɗanda ke da mahimman fa'idodin aikace-aikacen a cikin ƙididdigar ƙididdiga masu ƙarancin ƙarfi da na'urorin spintronic. A lokaci guda, kayan insulator na topological suma suna nuna kyawawan kaddarorin gani, kamar babban ma'anar refractive, manyan marasa daidaituwa.na ganicoefficient, m aiki bakan kewayon, tunability, sauki hadewa, da dai sauransu, wanda ya samar da wani sabon dandali domin gane haske tsari da kumaoptoelectronic na'urorin.
Tawagar bincike a kasar Sin ta ba da shawarar wata hanya don kera na'urorin resonators masu sirara ta hanyar yin amfani da babban yanki mai girma na bismuth telluride topological insulator nanofilms. Kogon gani yana nuna fayyace halayen juzu'i a kusa da rukunin infrared. Bismuth telluride yana da babban ma'aunin refractive fiye da 6 a cikin rukunin sadarwa na gani (mafi girma fiye da ma'anar refractive index na gargajiya high refractive index kayan kamar silicon da germanium), ta yadda kauri na gani cavity iya isa daya-20th na resonance. tsayin daka. A lokaci guda, na'urar resonator na gani yana ajiye akan kristal photonic mai girman fuska ɗaya, kuma an lura da wani sabon labari na electromagnetically induced transparency effects a cikin na'urar sadarwa na gani, wanda ya faru ne saboda haɗuwa da resonator tare da Tamm plasmon da tsangwama mai lalacewa. . Amsar kallon wannan tasirin ya dogara da kauri na resonator na gani kuma yana da ƙarfi ga canjin yanayi mai jujjuyawa. Wannan aikin yana buɗe wata sabuwar hanya don gane kogin gani na ultrathin, ƙa'idodin sifofin kayan insulator na topological da na'urorin optoelectronic.
Kamar yadda aka nuna a FIG. 1a da 1b, na'urar resonator na gani yawanci ya ƙunshi bismuth telluride topological insulator da nanofilms na azurfa. Bismuth telluride nanofilms da aka shirya ta hanyar magnetron sputtering suna da babban yanki da kyau mai kyau. Lokacin da kauri daga cikin bismuth telluride da azurfa fina-finan ne 42 nm da 30 nm, bi da bi, da Tantancewar cavity yana nuna karfi resonance sha a cikin band na 1100 ~ 1800 nm (Hoto 1c). Lokacin da masu binciken suka haɗa wannan rami na gani a kan kristal na photonic da aka yi da madaidaicin tarin Ta2O5 (182 nm) da SiO2 (260 nm) yadudduka (Hoto 1e), wani kwarin shayarwa (Hoto 1f) ya bayyana kusa da ainihin ƙwanƙwasawa mai ƙarfi (~ 1550nm), wanda yayi kama da tasirin bayyanannen lantarki da aka haifar da tsarin atomic.
Abun bismuth telluride an siffata shi ta hanyar watsawa ta microscopy da ellipsometry. FIG. 2a-2c yana nuna micrographs na watsawa na lantarki (hotuna masu girman gaske) da zaɓaɓɓun tsarin rarraba wutar lantarki na bismuth telluride nanofilms. Ana iya gani daga adadi cewa shirye-shiryen bismuth telluride nanofilms sune kayan polycrystalline, kuma babban yanayin haɓaka shine (015) jirgin saman crystal. Hoto na 2d-2f yana nuna hadadden fihirisar refractive na bismuth telluride da aka auna ta ellipsometer da yanayin saman da ya dace da ma'aunin ma'auni mai rikitarwa. Sakamakon ya nuna cewa ƙayyadaddun ƙayyadaddun ƙayyadaddun yanayin sararin samaniya ya fi girma fiye da ƙididdiga a cikin kewayon 230 ~ 1930 nm, yana nuna halaye irin na ƙarfe. Ma'anar refractive na jiki ya fi 6 lokacin da tsayin daka ya fi 1385 nm, wanda ya fi girma fiye da na silicon, germanium da sauran kayan gargajiya masu mahimmanci a cikin wannan band, wanda ya kafa harsashi don shirye-shiryen ultra. - bakin ciki na gani resonators. Masu binciken sun yi nuni da cewa wannan shi ne karon farko da aka bayar da rahoton gano wani rami na gani mai insulator mai kauri mai kauri na dubun nanometer kawai a cikin rukunin sadarwa na gani. Daga bisani, an auna bakan shaye-shaye da tsayin raƙuman raƙuman raƙuman gani na ultra-bakin ciki tare da kauri na bismuth telluride. A ƙarshe, an bincika tasirin kauri na fim ɗin azurfa akan abubuwan da aka haifar ta hanyar lantarki a cikin bismuth telluride nanocavity/tsarin kristal na hoto.
Ta hanyar shirya manyan filaye masu lebur na bismuth telluride masu insulators na topological, da kuma cin gajiyar ma'aunin ultra-high refractive index na kayan aikin Bismuth telluride a kusa da band ɗin infrared, an sami rami na gani mai tsari mai kauri na dubun nanometers kawai. Ƙaƙwalwar ƙwanƙwasa-baƙin ciki na iya gane ingantacciyar tasirin haske mai haske a cikin rukunin infrared na kusa, kuma yana da mahimmancin ƙimar aikace-aikacen haɓaka na'urorin optoelectronic a cikin rukunin sadarwa na gani. Kaurin ramin gani na bismuth telluride yana layi ne zuwa tsayin raƙuman raƙuman ruwa, kuma ya yi ƙasa da na siliki mai kama da kogon gani na germanium. A lokaci guda, bismuth telluride cavity na gani an haɗa shi tare da kristal photonic don cimma sakamako mara kyau na gani mai kama da bayyana gaskiyar tsarin atomatik, wanda ke ba da sabuwar hanya don ƙayyadaddun bakan ƙa'idar microstructure. Wannan binciken yana taka wata rawa wajen haɓaka binciken kayan insulator na topological a cikin tsarin haske da na'urorin aikin gani.
Lokacin aikawa: Satumba-30-2024