Li-parameter tsa motheo tsa li-photodetector tsa lets'oao la optical

Li-parameter tsa motheo tsa tšobotsi ea lets'oao la opticalli-photodetectors:

Pele ho hlahlojoa mefuta e fapaneng ea li-photodetector, likarolo tse ikhethang tsa ts'ebetso ea ts'ebetso eali-photodetector tsa matšoao a opticalli akaretsoa. ​​Litšobotsi tsena li kenyelletsa karabelo, karabelo ea spectral, matla a lekanang le lerata (NEP), ho lemoha ho itseng, le ho lemoha ho itseng. D*), bokhoni ba quantum, le nako ea karabelo.

1. karabelo Rd e sebediswa ho hlalosa kutlwisiso ya karabelo ya sesebediswa ho matla a mahlasedi a optical. E emelwa ke karolelano ya letshwao la tlhahiso ho letshwao la ketsahalo. Tshwaneleho ena ha e bontshe dibopeho tsa lerata tsa sesebediswa, empa e bontsha feela bokgoni ba ho fetola matla a mahlasedi a motlakase hore e be a motlakase kapa motlakase. Ka hona, e ka fapana ho ya ka bolelele ba letshwao la lesedi la ketsahalo. Ho phaella moo, dibopeho tsa karabelo ya matla le tsona ke mosebetsi wa leeme le sebediswang le mocheso o tikolohong.

2. Tšobotsi ea karabelo ea spectral ke paramethara e khethollang kamano pakeng tsa tšobotsi ea karabelo ea matla ea sesebelisoa sa ho lemoha lets'oao la mahlo le ts'ebetso ea bolelele ba lets'oao la mahlo la ketsahalo. Litšobotsi tsa karabelo ea spectral tsa li-photodetector tsa lets'oao la mahlo libakeng tse fapaneng tsa maqhubu hangata li hlalosoa ka bongata ka "mokokotlo oa karabelo ea spectral". Ho lokela ho hlokomeloa hore ke litšobotsi tse phahameng ka ho fetisisa tsa karabelo ea spectral karolong e ka hare tse lekanngoang ka boleng bo felletseng, 'me litšobotsi tse ling tsa karabelo ea spectral libakeng tse fapaneng tsa maqhubu li hlahisoa ka boleng bo tloaelehileng bo amanang ho latela boleng bo phahameng ka ho fetisisa ba litšobotsi tsa karabelo ea spectral.

3. Matla a lekanang le lerata ke matla a letshwao la lesedi la ketsahalo a hlokahalang ha motlakase wa letshwao la tlhahiso o hlahiswang ke sesebelisoa sa ho lemoha letshwao la mahlo o lekana le boemo ba motlakase wa lerata ba sesebediswa ka bosona. Ke ntlha e ka sehloohong e etsang qeto ya matla a bonyane a letshwao la mahlo a ka lekanngwang ke sesebelisoa sa ho lemoha letshwao la mahlo, ke hore, kutloelo-bohloko ya ho lemoha.

4. Kutloisiso e ikgethang ya ho lemoha ke paramethara e ikgethang e kgethollang dibopeho tsa tlhaho tsa thepa e utlwang lesedi ya detector. E emela bongata bo tlase ba photon ya hajwale bo ka lekanngwang ke detector ya letshwao la optical. Boleng ba yona bo ka fapana ho ya ka maemo a tshebetso a detector ya bolelele ba leqhubu la letshwao la lesedi le lekantsweng (jwalo ka mocheso o ambient, leeme le sebediswang, jj.). Ha bandwidth ya detector e le kgolo, sebaka sa detector ya letshwao la optical se le seholo, matla a lekanang le lerata a NEP a manyane, mme kutloisiso e ikgethang ya ho lemoha e phahame. Kutloisiso e phahameng ya detector ya detector e bolela hore e loketse ho lemoha matshwao a fokolang haholo a optical.

5. Bokgoni ba quantum Q ke parameter e 'ngoe ea bohlokoa ea ho lemoha matšoao a optical. E hlalosoa e le karolelano ea palo ea "likarabelo" tse ka baloang tse hlahisoang ke photomon ka har'a detector ho ea ho palo ea liketsahalo tsa photon holim'a thepa e utloang khanya. Mohlala, bakeng sa li-detector tsa leseli tse sebetsang ho emission ea photon, bokhoni ba quantum ke karolelano ea palo ea li-photoelectron tse ntšoang ho tloha holim'a thepa e utloang khanya ho ea ho palo ea li-photon tsa lets'oao le lekantsoeng le hlahisitsoeng holim'a metsi. Ka detector ea lets'oao la optical e sebelisang thepa ea semiconductor ea pn junction e le thepa e utloang khanya, bokhoni ba quantum ba detector bo baloa ka ho arola palo ea lipara tsa li-electron tse hlahisoang ke lets'oao la leseli le lekantsoeng ka palo ea li-photon tsa lets'oao la ketsahalo. Setšoantšo se seng se tloaelehileng sa bokhoni ba quantum ba detector ea lets'oao la optical ke ka mokhoa oa Rd ea karabelo ea detector.

6. Nako ea karabelo ke paramethara ea bohlokoa ho khetholla lebelo la karabelo la sesebelisoa sa ho lemoha matšoao a optical ho ea phetohong ea matla a lets'oao la leseli le lekantsoeng. Ha lets'oao la leseli le lekantsoeng le fetoloa ka mokhoa oa ho otla ha leseli, matla a lets'oao la motlakase la ho otla le hlahisoang ke ts'ebetso ea lona ho sesebelisoa sa ho lemoha a hloka ho "nyoloha" ho ea "tlhōrōng" e tsamaellanang kamora nako e itseng ea karabelo, le ho tloha "tlhōrōng" ebe a khutlela ho "boleng ba lefela" ba pele bo tsamaellanang le ts'ebetso ea ho otla ha leseli. E le ho hlalosa karabelo ea sesebelisoa sa ho lemoha phetohong ea matla a lets'oao la leseli le lekantsoeng, nako eo matla a lets'oao la motlakase le hlahisoang ke ho otla ha leseli la ketsahalo a nyolohang ho tloha boleng ba lona bo phahameng ka ho fetisisa ba 10% ho isa ho 90% e bitsoa "nako ea ho phahama", 'me nako eo sebopeho sa maqhubu a lets'oao la motlakase se theohang ho tloha boleng ba sona bo phahameng ka ho fetisisa ba 90% ho isa ho 10% e bitsoa "nako ea ho oa" kapa "nako ea ho bola".

7. Ho lekana ha karabelo ke parameter e 'ngoe ea bohlokoa e khethollang kamano ea ts'ebetso pakeng tsa karabelo ea sesebelisoa sa ho lemoha lets'oao la optical le matla a lets'oao la leseli le lekantsoeng ke ketsahalo. E hloka tlhahiso easesebelisoa sa ho lemoha matšoao a opticalho lekana ka hare ho sebaka se itseng sa matla a lets'oao la optical le lekantsoeng. Hangata ho hlalosoa hore phetoho ea peresente ho tloha ho linearity ea input-output ka hare ho sebaka se boletsoeng sa matla a lets'oao la optical la input ke linearity ea karabelo ea sesebelisoa sa ho lemoha lets'oao la optical.