Hanham, SM

Holmes, AS

Klein, N

Lucyszyn, S

Otter, WJ

Ridler, N

English

Spiral - Imperial College Digital Repository

 Sub-THz Photonic Crystal Devices  W. J. Otter1,2, S. Hanham1,3, N. Ridler4, A. S. Holmes2, N. Klein1,3, S. Lucyszyn1,3 1Center for Terahertz Science and Engineering, Imperial College London, UK 2Optical and Semiconductor Devices Group, Dept. of Electrical and Electronic Engineering, Imperial College London, UK 3Department of Materials, Imperial College London, UK 4National Physical Laboratory, Teddington, UK   Photonic Crystal (PC) based devices at mm-Wave and THz frequencies are attractive for future high performance applications in sensing, communications and radar. Within our research we have studied a variety of components that it is possible to create using photonic crystals technology between 75-125GHz, these include: filters [1], waveguides [2], and switches [2].  The PCs are fabricated from a 525 µm high resistivity silicon (>10 kΩ·cm) substrate with a periodic triangular lattice of air holes with a radius of 235 µm and lattice constant of 780 µm. This structure gives rise to a bandgap that extends from 97 – 127 GHz. To create devices defects are introduced into the lattice, a waveguide is a simply a line defect and then filters are made through creation of cavity within the structure by removing several holes. To create a switch the waveguide defect is illuminated by a laser [2], giving rise an extinction ratio of 40 dB demonstrated experimentally. These fundamental devices form the starting point for investigations to realize monolithic integrated photonic crystal architectures.   References [1] W. J. Otter, S. M. Hanham, N. Klein, S. Lucyszyn, Photonic Crystal Band Reject and Band Pass Filters, MPNS COST Action Training School – MP1204, Cortona, May 2013 [2] W. J. Otter, S. M. Hanham, E. Episkopou, Y. Zhou, N. Klein, A. S. Holmes, S. Lucyszyn, Photoconductive Photonic Crystal Switches, 38th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2013), Mainz, Sep. 2013 

Sub-THz photonic crystal devices

http://spiral.imperial.ac.uk/bitstream/10044/1/51054/2/2013_10_COSTMP1204a.pdf

Sub-THz photonic crystal devices

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