An ultrabroad and sharp transition bandpass flexible terahertz(THz)filter is designed using a multiple-layered metamaterial.This bandpass filter has excellent filtering capability,with a 3 dB bandwidth of about 0.47 T...An ultrabroad and sharp transition bandpass flexible terahertz(THz)filter is designed using a multiple-layered metamaterial.This bandpass filter has excellent filtering capability,with a 3 dB bandwidth of about 0.47 THz and sharp band-edge transitions of 80 dB/THz and 96 dB/THz,respectively,and it can be realized by a coupling individual resonance mode.We find that the geometry parameters have an influence on the transmission profile,which are capable of giving us meaningful guidance in design of high profile bandpass THz filters.The numerical results show that the multiple-layered flexible metamaterial provides an effective way to achieve ultrabroad THz devices.展开更多
We report on fractal-featured square and ring-shaped apertures with a Sierpinski carpet pattern(SCP)on metallic and superconducting NbN films.Multiple extraordinary terahertz(THz)transmission peaks are studied in the ...We report on fractal-featured square and ring-shaped apertures with a Sierpinski carpet pattern(SCP)on metallic and superconducting NbN films.Multiple extraordinary terahertz(THz)transmission peaks are studied in the transmission spectra using both THz time-domain spectroscopy and numerical simulation.The characteristic transmission peaks are found to be associated with the interaction of surface plasmon polaritons(SPPs)and localized surface plasmons(LSPs)for ring-shaped apertures.The effect of LSPs is less remarkable in the square apertures.For the superconducting NbN film,when the temperature is slightly lower than the critical transition temperature T_(c),the peak magnitude of SPP resonances is most prominent due to the non-monotonic temperature dependence of kinetic inductance.These results provide a new way to design compact and efficient THz devices.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2007CB310403the High Education Science Technology Project of Shandong Province(No J11LG74)the Science and Technology Project of Zaozhuang(No 201127).
文摘An ultrabroad and sharp transition bandpass flexible terahertz(THz)filter is designed using a multiple-layered metamaterial.This bandpass filter has excellent filtering capability,with a 3 dB bandwidth of about 0.47 THz and sharp band-edge transitions of 80 dB/THz and 96 dB/THz,respectively,and it can be realized by a coupling individual resonance mode.We find that the geometry parameters have an influence on the transmission profile,which are capable of giving us meaningful guidance in design of high profile bandpass THz filters.The numerical results show that the multiple-layered flexible metamaterial provides an effective way to achieve ultrabroad THz devices.
基金Supported by the National Basic Research Program of China(Nos 2011CBA00107,2011CBA00202)the National Natural Science Foundation of China under Grant Nos 61071009,61027008,11104110+1 种基金the Specialized Research Fund for Doctoral Program of Higher Education(20090091110040)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘We report on fractal-featured square and ring-shaped apertures with a Sierpinski carpet pattern(SCP)on metallic and superconducting NbN films.Multiple extraordinary terahertz(THz)transmission peaks are studied in the transmission spectra using both THz time-domain spectroscopy and numerical simulation.The characteristic transmission peaks are found to be associated with the interaction of surface plasmon polaritons(SPPs)and localized surface plasmons(LSPs)for ring-shaped apertures.The effect of LSPs is less remarkable in the square apertures.For the superconducting NbN film,when the temperature is slightly lower than the critical transition temperature T_(c),the peak magnitude of SPP resonances is most prominent due to the non-monotonic temperature dependence of kinetic inductance.These results provide a new way to design compact and efficient THz devices.
