Polarimetric imaging in infrared wavelengths have attracted more and more attention for broad applications in meteorological observations, medicine, remote sensing and many other fields. Metal metamaterial structures are used in nanophotonics in order to localize and enhance the incident electromagnetic field. Here we develop an elliptical gold Two-Dimensional Holes Array (2DHA) in which photons can be manipulated by surface plasmon resonance, and the ellipse introduce the asymmetry to realize a polarization selective function. Strong polarization dependence is observed in the simulated transmission spectra. To further understand the coupling mechanism between gold holes array and InP, the different parameters of the 2DHA are analyzed. It is shown that the polarization axis is perpendicular to the major axis of the ellipse, and the degree of polarization is determined by the aspect ratio of the ellipse. Furthermore, the resonance frequency of the 2DHA shows a linear dependence on the array period, the bandwidth of transmission spectra closely related to duty cycle of the ellipse in each period. This result will establish a basis for the development of innovative polarization selective infrared sensor.
The trade-off between the enhanced signal-to-noise ratio and reduced light absorption in thin-film photodetectors is
the main issue for improving device performance. Nanoscale patterning of metal/dielectric interface can couple incident
light into surface plasmon polaritons (SPPs) modes, leading to the enhanced absorption. However, due to the nature of
resonant excitation of SPPs, it is difficult to realize broadband absorption enhancement. In this study, we propose a novel
device structure to achieve absorption enhancement over the whole spectral response range of the thin-film In0.53Ga0.47As
photodetector. Numerical simulation shows that both the preferential forward scattering of InP cylinder and grating
coupled waveguide modes contribute to the broadband absorption enhancement.
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