Novel THz-Frequency Spectrometers by Integrating Widely-Tunable Monochromatic THz Sources and Detectors, or Arrays of Emitters and Detectors, With Photonic Bandgap Crystals

摘要

Within the last three months, we have investigated a 2-D photonic crystal embedded in a Si/SiO2/Si wafer. Such a study is essential for us to eventually implement an optimized photonic-crystal structure for splitting and combining the THz output and infrared pump beams. We have first optimized the design of our photonic crystal using the R-Soft software. We have then fabricated the photonic crystal. After that, we have tried to use the butt- coupling technique to measure the spatial profile of the guided wave propagating through the SOI slab waveguide. We have also observed a periodic pattern due to the diffraction of the input guided wave by the photonic crystal within the SOI sample plane. In order to independently measure the lattice constant for the photonic crystal, we have achieved the off-plane diffraction of the input beam propagating from an off-plane direction of the photonic crystal. All these findings are crucial to our SBIR Phase-II work.