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We design a compact triplexer based on two-dimensional (2D) hexagonal lattice photonic crystals (PCs).A folded directional coupler (FDC) is introduced in the triplexer beside the point-defect micro-cavities and line-defect waveguides.Because of the reflection feedback of the FDC,high channel drop efficiency can be realized and a compact size with the order of micrometers can be maintained.The proposed device is analyzed using the plane wave expansion method,and its transmission characteristics are calculated using the finite-difference time-domain method.The footprint of the triplexer is about 12× 9 μm,and its extinction ratios are less than –20 dB for 1310 nm,approximately –20 dB for 1490 nm,and under –40 dB for 1550 nm,making it a potentially essential device in future fiber-to-the-home networks. 相似文献
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Organic electroluminescent (EL) devices were firstly demonstrated in the 1960s, but great interest was not shown until 1987 that Tang and Vanslyke succeeded in developing an effective device using tris(8-hydroxyquin oline) aluminum (Alq3) as the emitter[1-4]. Since then, different kinds of organic dyes, chelate metal com- plex and polymers were synthesized to fabricate higher efficiency devices. Polymers containing rare earth have been used to fabricate the full-color devices because the ver… 相似文献
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<正>A novel polarization channel drop filter(PCDF) based on two-dimensional(2D) photonic crystals(PCs) is presented.It consists of two line defect waveguides and two point defect micro-cavities.In the line-defect waveguides,the transverse-electric(TE) and transverse-magnetic(TM) polarization lights are guided using photonic band-gap and total internal reflection effect,respectively.The light at the resonant frequency for TE polarization can be transferred from one waveguide to the other using the proposed system.Compared with the existing four-port PCDF based on PCs,the three-port structure can realize a multi-channel wavelength system of PCDF more easily and can be an essential device in future polarization wavelength division multiplexing(PWDM) systems. 相似文献
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