Quadruple-wavelength THz modulator based on compound lattice PC with direct-coupled and side-coupled structure
by Wen Zhou; He-Ming Chen
International Journal of Nanotechnology (IJNT), Vol. 12, No. 10/11/12, 2015

Abstract: As a key device of THz technologies, the THz modulator based on PC can realise the modulation of light waves. However, the traditional tunable PC modulator can only achieve a single beam of THz wave modulation by controlling a point defect, and multi-wavelength modulation can be realised by controlling the corresponding number of point defects with a complex operation. With the rapid development of microwave and light wave communication technology, the quadruple-wavelength THz modulator based on compound lattice PC can realise the 'on' and 'off' modulation of THz waves in quadruple-wavelength through the controlling of only two defects, using direct-coupled structure and side-coupled structure, respectively. We analyse and compare the performance of the quadruple-wavelength THz modulator based on compound lattice PC with the two kinds of structures. The results show that the contrast ratio is 44.6 dB and 13.8 dB, insert loss is 0.43 dB and 0.18 dB, and modulation rate is 7.1 GHz and 8.6 GHz of the modulator with direct-coupled structure and side-coupled structure, respectively. The modulator with direct-coupled structure has a higher contrast ratio, and can achieve modulation quadruple-wavelength of THz wave when the distance between the point defects is very short. The modulator with side-coupled structure is more excellent in the performance of insert loss and modulation rate.

Online publication date: Fri, 18-Sep-2015

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