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A tunable dual-narrowband pass-band filter is designed. A one-dimensional photonic crystal(1D PC) is comprised of alternate dielectric layer and vacuum layer. Two quantum wells(QWs) as defects can be constructed by sandwiching two plasma slabs symmetrically in the 1D PC, and a dual-narrowband pass-band filter is formed. The conventional finitedifference time-domain(FDTD) method and piecewise linear current density recursive convolution(PLCDRC)–FDTD method are applied to the dielectric and plasma, respectively. The simulation results illustrate that the dual-narrowband frequencies can be tuned by changing the plasma frequency. The pass band interval and the half-power bandwidths(-3-dB band widths) are related to the space interval between two QWs.
A one-dimensional photonic crystal (1D PC) is comprised of an alternate dielectric layer and a vacuum layer. Two quantum wells (QWs) as defects can be constructed by sandwiching two plasma slabs in exactly The 1D PC, and a dual-narrowband pass-band filter is formed. The conventional finited time-domain (FDTD) method and piecewise linear current density recursive convolution (PLCDRC) -FDTD method are applied to the dielectric and plasma, respectively. simulation results illustrate that the dual-narrowband frequencies can be tuned by changing the plasma frequency. The pass band interval and the half-power bandwidths (-3-dB band widths) are related to the space interval between two QWs.