Bhendi rekutaurirana remaziso, resonator yemaziso yakatetepa kwazvo

Bhendi rekutaurirana remaziso, resonator yemaziso yakatetepa kwazvo
Maoptical resonators anogona kuona marefu chaiwo emafungu echiedza munzvimbo diki, uye ane mashandisirwo akakosha mukudyidzana kwezvinhu zvechiedza,kutaurirana kwemaziso, optical sensing, uye optical integration. Saizi ye resonator inonyanya kutsamira pahunhu hwezvinhu uye marefu ekushanda, semuenzaniso, silicon resonators dzinoshanda mu near infrared band dzinowanzoda ma optical structures emazana e nanometers zvichikwira. Mumakore achangopfuura, ultra-thin planar optical resonators dzakakwezva kutariswa kukuru nekuda kwekushandiswa kwadzo mu structural color, holographic imaging, light field regulation uye optoelectronic devices. Maitiro ekuderedza ukobvu hwe planar resonators ndeimwe yematambudziko akaoma anotarisana nevaongorori.
Kusiyana nezvinhu zve semiconductor zvechinyakare, 3D topological insulators (yakadai se bismuth telluride, antimony telluride, bismuth selenide, nezvimwewo) zvinhu zvitsva zveruzivo zvine mamiriro esimbi akachengetedzwa ne topologically uye mamiriro e insulator. Mamiriro epamusoro anodzivirirwa nekuenzana kwekuchinja kwenguva, uye maerekitironi ayo haana kupararira nekusvibiswa kusiri kwemagineti, izvo zvine mukana wekushandiswa kwakakosha mu quantum computing ine simba shoma uye spintronic zvishandiso. Panguva imwe chete, zvinhu zve topological insulator zvinoratidzawo hunhu hwakanaka hwe optical, senge high refractive index, large nonlinear.chiedzacoefficient, wide working spectrum range, tuningability, nyore kubatanidzwa, nezvimwewo, izvo zvinopa chikuva chitsva chekuzadzisa mwenje wekutonga uyezvishandiso zvemagetsi zve optoelectronic.
Chikwata chekutsvagisa muChina chakapa nzira yekugadzira ma resonator e optical akatetepa zvikuru nekushandisa bismuth telluride topological insulator nanofilms inokura munzvimbo yakakura. Optical cavity inoratidza hunhu hwe resonance absorption huri pedyo ne infrared band. Bismuth telluride ine refractive index yakakwira zvikuru inopfuura 6 mu optical communication band (yakakwirira kupfuura refractive index yezvinhu zvechinyakare zve refractive index zvakaita sesilicon negermanium), kuitira kuti ukobvu hwe optical cavity hugone kusvika chikamu chimwe chete pamakumi maviri che resonance wavelength. Panguva imwe chete, optical resonator inoiswa pa one-dimensional photonic crystal, uye electromagnetically induced transparency effect inoonekwa mu optical communication band, izvo zvinokonzerwa nekubatana kwe resonator ne Tamm plasmon uye kukanganisa kwayo kunoparadza. Mhinduro ye spectral yemhedzisiro iyi inoenderana nehukobvu hwe optical resonator uye yakasimba pakuchinja kwe ambient refractive index. Basa iri rinovhura nzira itsva yekuzadzisa ultrathin optical cavity, topological insulator material spectrum regulation uye optoelectronic devices.
Sezvakaratidzwa muMufananidzo 1a na1b, optical resonator inonyanya kuumbwa ne bismuth telluride topological insulator uye silver nanofilms. Bismuth telluride nanofilms yakagadzirwa nemagnetron sputtering ine nzvimbo yakakura uye yakatsetseka zvakanaka. Kana ukobvu hwebismuth telluride nesilver films huri 42 nm uye 30 nm, zvichiteerana, optical cavity inoratidza strong resonance absorption mubhendi re1100 ~ 1800 nm (Mufananidzo 1c). Vaongorori pavakabatanidza optical cavity iyi pa photonic crystal yakagadzirwa nema stacks eTa2O5 (182 nm) uye SiO2 (260 nm) layers (Mufananidzo 1e), distinct absorption valley (Mufananidzo 1f) yakaonekwa pedyo ne original resonant absorption peak (~1550 nm), iyo yakafanana ne electromagnetically induced transparency effect inogadzirwa nema atomic systems.

Zvinhu zvebismuth telluride zvairatidzwa ne transmission electron microscopy uye ellipsometry. Mufananidzo 2a-2c unoratidza transmission electron micrographs (mifananidzo yepamusoro-soro) uye mapatani e diffraction e electron akasarudzwa e bismuth telluride nanofilms. Zvinogona kuonekwa kubva pamufananidzo kuti bismuth telluride nanofilms dzakagadzirirwa zvinhu zve polycrystalline, uye chinangwa chikuru chekukura i (015) crystal plane. Mufananidzo 2d-2f unoratidza complex refractive index ye bismuth telluride yakayerwa ne ellipsometer uye fitted surface state and state complex refractive index. Mhedzisiro yacho inoratidza kuti extinction coefficient ye surface state yakakura kupfuura refractive index iri pakati pe230 ~ 1930 nm, ichiratidza hunhu hwakafanana nesimbi. Refractive index yemuviri inodarika 6 kana wavelength yakakura kupfuura 1385 nm, iyo yakakwirira zvikuru kupfuura yesilicon, germanium nezvimwe zvinhu zvechinyakare zve high-refractive index zviri mubhendi iri, izvo zvinoisa hwaro hwekugadzirira ma ultra-thin optical resonators. Vaongorori vanoti uku ndiko kutanga kutaurwa kwe topological insulator planar optical cavity ine ukobvu hwemakumi e nanometers mubhendi rekutaurirana re optical. Mushure mezvo, absorption spectrum uye resonance wavelength ye ultra-thin optical cavity yakayerwa nehukobvu hwe bismuth telluride. Pakupedzisira, mhedzisiro ye silver film thick pane electromagnetically induced transparency spectra mu bismuth telluride nanocavity/photonic crystal structures inoongororwa.

Nekugadzira mafirimu matete enzvimbo yakakura e bismuth telluride topological insulators, uye kushandisa mukana we ultra-high refractive index yezvinhu zveBismuth telluride mu near infrared band, planar optical cavity ine ukobvu hwemakumi e nanometers chete inowanikwa. Ultra-thin optical cavity inogona kuwana resonant light absorption inoshanda mu near infrared band, uye ine kukosha kwakakosha mukugadzirwa kwe optoelectronic devices mu optical communication band. Ukobvu hwe bismuth telluride optical cavity hwakafanana ne resonant wavelength, uye hudiki pane hwesilicon ne germanium optical cavity yakafanana. Panguva imwecheteyo, bismuth telluride optical cavity yakabatanidzwa ne photonic crystal kuti iwane anomalous optical effect yakafanana ne electromagnetically induced transparency ye atomic system, iyo inopa nzira itsva ye spectrum regulation ye microstructure. Chidzidzo ichi chine basa rakati mukusimudzira kutsvagurudza kwezvinhu zve topological insulator mu light regulation uye optical functional devices.