Transmittance of a tunable filter at terahertz frequencies

Abstract

A metallic photonic crystal filter has been demonstrated at terahertz frequencies, with the passband tuneable over the range 365 -386 GHz. Tuning is achieved by a relative lateral shift of two metallic photonic crystal plates. Each plate comprises two orthogonal layers of gratings and integral mounting lugs. The plates are micromachined from silicon wafers then coated in gold to provide metallic electromagnetic behaviour. An insertion loss of 3 -7 dB and Q in the range 20 -30 was achieved. A shift of 140 µm gave a tuning range of 21 GHz, tuning sensitivity of 150 GHz/mm and a fractional tuning range of 6%.

Multi-channel homodyne detection of continuous-wave terahertz radiation

“…11 The construction of these filters is described in detail in Refs. 11-13, with the frequency response given in Fig.…”

Double channel mechanically tunable terahertz filter based on parallel plate waveguide cavities

“…Ideally, the basic features for terahertz filters should be simple, easy to manufacture, and dynamically tunable. Dynamically tunable terahertz filters based on metamaterial, liquid crystal, waveguide and photonic crystal cavity have been reported [2][3][4][5][6][7]. For example, if the U-shape resonator is overlaid on another U-shape resonator, by changing the overlap length of two resonators, tunability as large as 0.4THz can be achieved [7].…”

Fabrication and Characterization of GaP Photonic Crystals for Terahertz Wave Application

“…Comparing to applications of passive devices such as filters, waveguides and PC fibers, there are few active devices. [31][32][33][34][35] In this study, we have fabricated GaP waveguide with twodimensional photonic structure and demonstrated the THzwave generation from the GaP slab waveguide with the PC structure as a cladding layer.…”