This work gives an overview of THz photonic crystal and metal mesh filters technologies being developed at Imperial College London. High resistivity silicon photonic crystal technology has been used to demonstrate waveguides [1, 2], switches [1], attenuators [2], resonators [3] and bio-sensors [4] working at 0.1 THz, exhibiting state-of-the-art performance and providing the basis for novel THz architectures. With the latter, metal mesh filters have been shown to work with a low cost electrically thick substrate throughout the THz band [5]. Furthermore, we have theoretically shown their use as THz absorbers [6] and (in collaboration with ISCTE-IUL) a THz MEMS technology for demonstrating stress sensors [7].

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