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We present a novel approach for efficient terahertz signal generation at silicon nanophotonic waveguides via electro-optic difference frequency generation using telecom wavelengths excitation pulses. Second-order nonlinearity of silicon is achieved by plasma-activated surface modification.
Here we demonstrate the experimental results on in-house fabricated polymer THz porous fiber with sub-wavelength features. The experimental results confirm the theoretical prediction of low dispersion characteristics in a THz porous fiber as compared to a microwire.
High-speed asynchronous optical sampling is used for the rapid and precise determination of transmission resonances of terahertz surface sensors based on asymmetric double split ring resonator arrays. The sensor response represented by a characteristic resonant frequency is determined to 0.66113 THz with an accuracy of plusmn325 MHz within 2 seconds of read-out time.
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