Kauj Ruam 7: Tshaj Tawm Dub thiab Dawb: Xauv qhov zais zais ntawm cov lim lim

Thaum cov ntxaij lim dej feem ntau dhau los yog thaiv lub teeb wavelengths, cov ntxaij lim dej yog xaiv ntau dua. Lawv xa tag nrho cov wavelengths tshwj tsis yog rau ib qho tshwj xeeb uas lawv attenuate lossis thaiv. Qhov kev muaj peev xwm tsis lees txais cov nqaim nqaim ua rau cov ntxaij lim dej ua haujlwm tseem ceeb hauv ntau daim ntawv thov.

Cov ntxaij lim dej tsis zoo ua haujlwm los ntawm kev siv cuam tshuam cuam tshuam hauv lawv cov qauv tsim ntau yam. Lawv muaj alternating txheej ntawm ob pob tshab ntaub ntawv nrog txawv refractive indices, feem ntau dielectric cov ntaub ntawv xws li iav. Cov khaubncaws sab nraud povtseg no cuam tshuam txog qee lub teeb pom kev thaum xa mus rau lwm tus, nyob ntawm lawv cov wavelengths thiab thicknesses ntawm cov khaubncaws sab nraud povtseg.

Cov ntxaij lim dej tau tsim los kom muaj qhov siab tshaj plaws ntawm ib qho wavelength, lub npe hu ua qhov ntsuas qhov ntsuas. Lub wavelengths ze rau qhov kev cuam tshuam ntawm kev cuam tshuam uas ua rau nqus thiab attenuation, thaum lub wavelengths nyob deb dhau tsis cuam tshuam. Qhov dav ntawm qhov blocked notch band txiav txim siab lub lim lub sharpness thiab attenuation theem.

Qee cov ntxaij lim dej siv cov ntsiab lus nqus es tsis cuam tshuam los tsis lees paub qhov tshwj xeeb wavelength band. Txawm li cas los xij, cov ntxaij lim dej cuam tshuam muab qhov chaw siab tshaj qhov siab dua thiab siab dua qhov tsis lees paub, nrog rau qib attenuation nce mus txog -200dB hauv qee qhov qauv. Lawv tuaj yeem thaiv qhov nqaim nqaim me me li ob peb nanometers dav.

Notch lim pom dav siv hauv kev sib txuas lus. Lawv tau siv los tsis lees txais cov neeg nqa khoom tshwj xeeb hauv RF systems, tshem tawm suab nrov thiab cuam tshuam los txhim kho cov teeb liab zoo. Cov ntxaij lim dej tseem ua lub luag haujlwm tseem ceeb hauv kev tawm tsam electromagnetic cuam tshuam (EMI) los ntawm kev txo qis cov cim tsis xav tau ntawm qee zaus.

Hauv optics, cov ntxaij lim dej yog cov khoom tseem ceeb hauv fiber ntau optic telecommunication systems. Lawv siv los thaiv cov Raman thiab Brillouin spectral tshwj xeeb uas tuaj yeem cuam tshuam cov teeb liab kho qhov muag thaum sib kis. Cov ntxaij lim dej tseem ua kom muaj qhov sib txawv ntawm qhov sib txawv (WDM) los ntawm kev txo cov wavelengths tshwj xeeb rau lwm cov channel.

Notch filters kuj tseem ceeb heev hauv spectroscopy. Lawv thaiv cov emissions tshwj xeeb los yog nqus wavelengths, tso cai rau cov kws tshawb fawb cais tawm thiab txheeb xyuas lwm yam spectral uas nyiam. Clear notch filters enables high-resolution spectroscopy thiab rhiab ntsuas ntawm me me wavelength hloov.

Advanced fabrication cov tswv yim pab txhim kho kom tsis txhob lim kev ua haujlwm. Cascading ntau-notch lim tuaj yeem ua tiav qhov kev tsis lees paub ntau ntxiv. Tunable notch filters ntiav microelectromechanical systems (MEMS) los yog kua siv lead ua technologies tuaj yeem hloov kho lawv cov wavelengths, ua rau lub sijhawm ua tiav cov teeb liab. Raws li cov ntawv lim lim tsim tau hloov zuj zus, cov ntawv thov siv ntau dua yuav tshwm sim thoob plaws ntau lub teeb thiab teeb pom kev ua haujlwm.

Nyob rau hauv cov ntsiab lus, notch filters qhia lub tswv yim muaj peev xwm ntawm dub-thiab-dawb filtering mus kom ze. Lawv lub peev xwm los xaiv qhov nqaim nqaim nyob rau hauv ib qho kev sib kis spectral ntau yam qhib qhov muaj peev xwm hauv kev teeb tsa, kev sib txuas lus, spectroscopy, thiab tshaj. Raws li cov thev naus laus zis cuam tshuam los ntawm cov ntxaij lim dej ua ntej, qhov tseeb thiab lub peev xwm ntawm cov ntxaij lim dej zoo kawg no yuav txuas ntxiv mus ntxiv, qhib lub sijhawm tshiab rau kev tsim kho tshiab thiab kev tshawb pom.