IntroduceInGaAs photodetector
InGaAs ndechimwe chezvakanakira zvinhu zvekuwana yakakwirira-mhinduro uyehigh-speed photodetector. Chekutanga, InGaAs ndeye yakananga bandgap semiconductor zvinhu, uye upamhi hwayo hwebhendi hunogona kudzorwa nereshiyo pakati peIn neGa, zvichiita kuti kuonekwe kwezviratidzo zvemaziso zveavelengths akasiyana. Pakati pavo, In0.53Ga0.47As inofananidzwa zvakakwana neInP substrate lattice uye ine yakanyanyisa kupinza chiedza coefficient mu optical communication band. Ndiyo inonyanya kushandiswa mukugadzirira kwephotodetectoruye zvakare ine yakanakisa yakasviba yazvino uye yekupindura kuita. Kechipiri, zvese InGaAs uye InP zvinhu zvine akakwira maelectronic drift velocities, ane mazariro erekitironi ekukukurwa kwemagetsi ese ari maviri anenge ari 1 × 107cm/s. Zvichakadaro, pasi pemasimu emagetsi chaiwo, InGaAs uye InP zvinhu zvinoratidzira electron velocity overshoot mhedzisiro, ine overshoot velocities inosvika 4 × 107cm/s uye 6 × 107cm/s zvichiteerana. Inobatsira kuwana yakakwirira kuyambuka bandwidth. Parizvino, InGaAs mafotodetectors ndiwo anonyanya kufarirwa mafotodetector ekutaurirana kwemaziso. Mumusika, iyo yepamusoro-chiitiko coupling nzira ndiyo yakajairika. Surface-incident detector zvigadzirwa zvine 25 Gaud/s uye 56 Gaud/s zvinogona kutogadzirwa-zhinji. Zvidiki-saizi, kumashure-chiitiko, uye yakakwirira-bandwidth kumusoro-chiitiko-chiitiko ma detectors akagadziridzwawo, kunyanya kune maapplication akadai senge kukurumidza uye yakakwira saturation. Nekudaro, nekuda kwekuganhurirwa kwemaitiro avo ekubatanidza, pamusoro pezviitiko zvinoongorora zvinonetsa kubatanidza nemamwe maoptoelectronic zvishandiso. Naizvozvo, nekuwedzera kuri kuda kwekubatanidzwa kweoptoelectronic, waveguide yakasanganiswa InGaAs mafotodetectors ane hunyanzvi hwekuita uye akakodzera kubatanidza zvishoma nezvishoma ave chinangwa chekutsvaga. Pakati pavo, yekutengesa InGaAs photodetector modules ye70GHz uye 110GHz dzinenge dzese dzinotora waveguide coupling zvimiro. Zvinoenderana nemusiyano wezvinhu zve substrate, waveguide yakasanganiswa InGaAs mafotodetectors anogona kunyanya kuiswa mumhando mbiri: INP-yakavakirwa uye Si-yakavakirwa. Iyo epitaxial yezvinhu paInP substrates ine yemhando yepamusoro uye inonyanya kukodzera kugadzirwa kwezvishandiso zvemhando yepamusoro. Nekudaro, zveIII-V zveboka zvinhu zvakakura kana kusungirirwa paSi substrates, nekuda kwekukanganisa kwakasiyana pakati peInGaAs zvinhu neSi substrates, zvinhu kana chimiro chemhando yakashata, uye pachine nzvimbo yakakura yekuvandudza mukuita kwemidziyo.
Kugadzikana kwefotodetector munzvimbo dzakasiyana dzekushandisa, kunyanya pasi pemamiriro akanyanya, zvakare chimwe chezvinhu zvakakosha mukushandisa zvinoshanda. Mumakore achangopfuura, marudzi matsva emagetsi akadai se perovskite, organic uye maviri-dimensional zvinhu, izvo zvave zvichikwezva kutarisa kwakanyanya, zvichiri kutarisana nematambudziko akawanda maererano nekugadzikana kwenguva refu nekuda kwekuti zvinhu pachavo zvinokanganiswa nyore nyore nemamiriro ezvakatipoteredza. Zvichakadaro, nzira yekubatanidza yezvinhu zvitsva haisati yakura, uye kumwe kuongorora kuchiri kudikanwa pakugadzirwa kwakakura uye kuenderana kwekuita.
Kunyangwe kuunzwa kwemainductors kuchigona kuwedzera bandwidth yemidziyo parizvino, haina kufarirwa mumadhijitari optical communication system. Naizvozvo, maitiro ekudzivirira kukanganisa kwakashata kuti uwedzere kudzikisa parasitic RC maparamita emudziyo ndeimwe yenzira dzekutsvagisa dzehigh-speed photodetector. Kechipiri, sezvo bandwidth yewaveguide yakasanganiswa mapikicha inoramba ichiwedzera, iyo inomanikidza pakati pebandwidth uye revisheni inotanga kubuda zvakare. Kunyange zvazvo Ge/Si photodetectors uye InGaAs photodetector ine 3dB bandwidth inodarika 200GHz yakashumwa, basa ravo harigutsi. Maitiro ekuwedzera bandwidth paunenge uchichengetedza kuita kwakanaka inyaya yakakosha yekutsvagisa, iyo inogona kuda kuunzwa kwezvinhu zvitsva-zvinoenderana nemaitiro (yakakwirira kufamba uye yakakwirira kunyura coefficient) kana novel yakakwirira-kumhanya zvimiro zvekugadzirisa. Uye zvakare, sezvo bandwidth yemudziyo inowedzera, mamiriro ekushandisa ekuona mu microwave photonic links anozowedzera zvishoma nezvishoma. Kusiyana nediki remagetsi emagetsi chiitiko uye yakakwirira-sensitivity yekuona mu optical communication, chiitiko ichi, pahwaro hwepamusoro bandwidth, ine yakakwirira saturation simba kudiwa kwepamusoro-simba chiitiko. Zvisinei, michina ye-high-bandwidth inowanzotora zvimiro zviduku, saka hazvisi nyore kugadzira mapikicha e-high-speed uye high-saturation-simba, uye humwe hutsva hunogona kudiwa mukutakura kwekutakura uye kupisa kwekushisa kwemidziyo. Chekupedzisira, kudzikisa rima razvino rema-high-speed detectors rinoramba riri dambudziko iro mafotodetectors ane lattice mismatch inoda kugadzirisa. Rima ikozvino rinonyanya kuenderana nekristaro mhando uye pamusoro pemamiriro ezvinhu. Naizvozvo, maitiro akakosha akadai seyepamusoro-mhando heteroepitaxy kana bonding pasi pelattice mismatch masisitimu inoda kumwe kutsvagisa nekudyara.
Nguva yekutumira: Aug-20-2025