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In this paper, optical absorptions in silicon nanowires (SiNWs) arrays obtained from theoretical studies and experimental approaches have been reviewed. A brief description on the different growth techniques for SiNW arrays reported so far is presented. Comparative analysis based on major research findings has been done and the advantages of SiNW-based solar cells over thin film solar cells are presented. Furthermore, future aspects of the use of SiNWs for photovoltaic applications are discussed.

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In this paper, the design & performance of two dimensional (2-D) photonic crystal (PhC) wavelength division demultiplexer is investigated using finite difference time domain (FDTD) method. The photonic band gap (PBG) is calculated by plane wave expansion (PWE) method. The reported design provides two de-multiplexed signals one at wavelength 1.31µm and another at wavelength 1.55µm which belong to the most popular II and III windows with respect to low attenuation and dispersion losses in optical communication system. The device is investigated by varying the design parameters. This de-multiplexer is useful for wavelength division de-multiplexing (WDDM) applications. This may serve as key component in integrated nanophotonic circuits. The de-multiplexer is designed by two dimensional photonic crystal having 14×17 dielectric rods suspended in the air background. The Q factor of this de-multiplexer is obtained about 224 and 250 for wavelengths 1.31µm and 1.55µm respectively.