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We present an approach to design focusing reflectors using two-dimensional sub-wavelength gratings (2D SWGs). The effect of the grating reflecting mirrors size on the reflection focusing performance is investigated. The performance parameters considered mainly include focal length, phase change, numerical aperture. Using COMSOL software, the simulation results show that the focal length are affected...
a new photodetector was designed with Metal Aperture Arrays filter in this paper. The shape and dimensions of the holes in an arrays do influence its transmission spectrum compare to the conventional photodetector. Hole array and annular aperture arrays were discussed.
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