Sirin-fim lithium tantalate (LTOI) abu yana fitowa a matsayin wani gagarumin sabon ƙarfi a cikin hadedde na gani filin. A wannan shekara, an buga ayyuka masu girma da yawa akan na'urori na LTOI, tare da ingantattun wafers na LTOI wanda Farfesa Xin Ou daga Cibiyar Nazarin Microsystem da Fasahar Watsa Labarai ta Shanghai ya samar, da kuma ingantattun hanyoyin etching na igiyar ruwa da ƙungiyar Farfesa Kippenberg ta EPFL ta samar. , Switzerland. Ƙoƙarin haɗin gwiwarsu ya ba da sakamako mai ban sha'awa. Bugu da ƙari, ƙungiyoyin bincike na Jami'ar Zhejiang karkashin jagorancin Farfesa Liu Liu da Jami'ar Harvard karkashin jagorancin Farfesa Loncar sun kuma ba da rahoto game da masu saurin gaske, masu tsayin daka na LTOI.
A matsayin dangin ku na lithium niobate na bakin ciki-fim (LNOI), LTOI yana riƙe da babban saurin daidaitawa da ƙarancin hasara na lithium niobate yayin da kuma yana ba da fa'idodi kamar ƙarancin farashi, ƙarancin birefringence, da rage tasirin hoto. An gabatar da kwatancen manyan halaye na kayan biyu a ƙasa.
◆ Kamanceceniya tsakanin Lithium Tantalate (LTOI) da Lithium Niobate (LNOI)
①Fihirisar Rarraba:2.12 vs 2.21
Wannan yana nuna cewa ma'auni guda ɗaya na waveguide, radius na lanƙwasa, da girman na'urar gama gari dangane da kayan biyu suna kama da juna, kuma aikin haɗin fiber ɗin su ma yana kwatankwacinsa. Tare da mai kyau waveguide etching, duka kayan za su iya cimma asarar sakawa<0.1 dB/cm. EPFL ta ba da rahoton asarar jagorar raƙuman ruwa na 5.6 dB/m.
②Electro-optic Coefficient:30.5pm/V vs 30.9pm/V
Ƙimar haɓakar haɓaka yana da kwatankwacin duka kayan biyu, tare da daidaitawa dangane da tasirin Pockels, yana ba da damar babban bandwidth. A halin yanzu, masu daidaitawa na LTOI suna da ikon cimma 400G a kowane aikin layi, tare da bandwidth wanda ya wuce 110 GHz.
③Bandgap:3.93 eV vs 3.78 eV
Dukansu kayan biyu suna da faffadan taga mai fa'ida, masu goyan bayan aikace-aikace daga bayyane zuwa tsayin raƙuman infrared, ba tare da ɗauka a cikin madafan sadarwa ba.
④Ƙididdigar ƙididdiga marasa kan layi na biyu (d33):21pm/V vs 27pm/V
Idan aka yi amfani da shi don aikace-aikacen da ba na kan layi ba kamar ƙarni na biyu masu jituwa (SHG), rarrabuwa-mita-girma (DFG), ko jimlar juzu'i (SFG), ingancin juzu'i na kayan biyu ya kamata su kasance iri ɗaya.
◆ Fa'idar Kudin LTOI vs LNOI
①Ƙananan Farashin Shirye-shiryen Wafer
LNOI na buƙatar He ion implantation don rabuwa na Layer, wanda ke da ƙarancin ionization. Sabanin haka, LTOI yana amfani da dasawa na H ion don rabuwa, kama da SOI, tare da ingantaccen delamination sama da sau 10 sama da LNOI. Wannan yana haifar da gagarumin bambanci na farashi don wafers 6-inch: $ 300 vs. $ 2000, raguwar 85% na farashi.
②An riga an yi amfani da shi sosai a cikin kasuwar kayan lantarki na mabukaci don masu tace sauti(raka'a 750,000 kowace shekara, Samsung, Apple, Sony, da sauransu ke amfani da su).
◆ Amfanin Ayyuka na LTOI vs LNOI
①Karancin Lalacewar Material, Rarraunan Tasirin Hoto, Ƙarin Natsuwa
Da farko, masu daidaitawa na LNOI galibi suna baje kolin ɓacin rai, da farko saboda cajin tarawa da lahani ke haifarwa a mahaɗar waveguide. Idan ba a kula da su ba, waɗannan na'urori na iya ɗaukar kwana ɗaya don daidaitawa. Duk da haka, an samar da hanyoyi daban-daban don magance wannan batu, kamar yin amfani da ƙarfe oxide cladding, substrate polarization, da annealing, wanda ya sa wannan matsala ta fi dacewa a yanzu.
Sabanin haka, LTOI yana da ƙarancin lahani na kayan abu, wanda ke haifar da raguwar abubuwan ban mamaki. Ko da ba tare da ƙarin sarrafawa ba, wurin aiki ya kasance ɗan kwanciyar hankali. EPFL, Harvard, da Jami'ar Zhejiang sun ruwaito irin wannan sakamakon. Koyaya, kwatancen galibi yana amfani da na'urori masu daidaitawa na LNOI waɗanda ba a kula da su ba, waɗanda ƙila ba za su yi adalci gaba ɗaya ba; tare da sarrafawa, aikin duka kayan yana iya kama. Babban bambancin ya ta'allaka ne a cikin LTOI da ke buƙatar ƙarin ƙarin matakan sarrafawa.
②Ƙananan Ƙarfafawa: 0.004 vs 0.07
Babban birefringence na lithium niobate (LNOI) na iya zama ƙalubale a wasu lokuta, musamman kamar yadda lanƙwasa igiyar igiyar ruwa na iya haifar da haɗakar yanayi da haɓaka yanayin. A cikin bakin ciki LNOI, lanƙwasa a cikin waveguide na iya jujjuya hasken TE zuwa hasken TM, yana dagula ƙirƙira wasu na'urori masu wucewa, kamar masu tacewa.
Tare da LTOI, ƙananan birefringence yana kawar da wannan batu, mai yuwuwa ya sauƙaƙa don haɓaka manyan na'urori masu amfani. EPFL kuma ya ba da rahoton sakamako mai ban sha'awa, yana ba da ƙarancin ƙarancin birefringence na LTOI da rashin hayewa don cimma ƙirar mitar mitar lantarki mai faɗin bakan tare da sarrafa watsawa mai lebur a cikin kewayon gani. Wannan ya haifar da ban sha'awa 450 nm comb bandwidth tare da sama da 2000 tsefe Lines, sau da yawa girma fiye da abin da za a iya samu da lithium niobate. Idan aka kwatanta da combs na mitar gani na Kerr, combs na lantarki-optic suna ba da fa'idar kasancewa mara iyaka da kwanciyar hankali, kodayake suna buƙatar shigarwar microwave mai ƙarfi.
③Mafi Girma Ƙaddamar Lalacewar gani
Matsakaicin lalacewar gani na LTOI sau biyu na LNOI, yana ba da fa'ida a aikace-aikacen da ba na kan layi ba (da yuwuwar aikace-aikacen Cikakkun Cikakkun Ciki (CPO). Matakan ikon gani na gani na yanzu ba zai yiwu su lalata lithium niobate ba.
④Low Raman Effect
Wannan kuma ya shafi aikace-aikacen da ba na kan layi ba. Lithium niobate yana da tasiri mai ƙarfi na Raman, wanda a cikin aikace-aikacen mitar na gani na Kerr zai iya haifar da samar da hasken Raman maras so da samun gasa, yana hana x-cut lithium niobate combs na gani na mitar mita isa ga soliton jihar. Tare da LTOI, ana iya danne tasirin Raman ta hanyar ƙira mai ƙira, yana barin x-yanke LTOI don cimma ƙirar mitar gani na soliton. Wannan yana ba da damar haɗin haɗin kai na soliton na mitar gani na soliton tare da masu daidaita saurin sauri, abin da ba zai yuwu ba tare da LNOI.
◆ Me yasa Ba a Ambaci Lithium Tantalate (LTOI) Mai Sirara Ba Tun Tun Da farko?
Lithium tantalate yana da ƙarancin zafin jiki na Curie fiye da lithium niobate (610°C vs. 1157°C). Kafin haɓaka fasahar haɗin kai (XOI), masu haɓaka lithium niobate an ƙera su ta amfani da yaduwar titanium, wanda ke buƙatar annealing sama da 1000 ° C, yana sa LTOI bai dace ba. Koyaya, tare da jujjuyawar yau zuwa yin amfani da insulator substrates da waveguide etching don ƙirƙirar modulator, zafin jiki na 610°C Curie ya fi wadatar.
◆ Shin Lithium Tantalate (LTOI) Na Sirin-Fim Zai Maye Gurbin Lithium Niobate (TFLN) Na Siriri?
Dangane da bincike na yanzu, LTOI yana ba da fa'idodi a cikin aiki mara kyau, kwanciyar hankali, da ƙimar samarwa mai girma, ba tare da fa'ida ba. Koyaya, LTOI baya wuce lithium niobate a cikin aikin daidaitawa, kuma matsalolin kwanciyar hankali tare da LNOI sun san mafita. Don tsarin sadarwa na DR, akwai ƙarancin buƙatu don abubuwan da ba a iya amfani da su ba (kuma ana iya amfani da nitride silicon idan an buƙata). Bugu da ƙari, ana buƙatar sabbin saka hannun jari don sake kafa matakan etching matakin wafer, dabarun haɗin kai, da gwajin dogaro (wahalar da ke tattare da lithium niobate etching ba shine jagorar igiyar ruwa ba amma samun babban matakin wafer etching). Don haka, don yin gasa tare da kafaffen matsayin lithium niobate, LTOI na iya buƙatar buɗe wasu fa'idodi. A ilimi, duk da haka, LTOI yana ba da gagarumin yuwuwar bincike don haɗaɗɗen tsarin kan guntu, irin su octave-spanning electro-optic combs, PPLT, soliton da AWG na'urorin raba raƙuman raƙuman ruwa, da tsararru masu daidaitawa.
Lokacin aikawa: Nuwamba-08-2024