Volume and surface mode coupling experiments in periodic surface structures for use in mm-THz high power radiation sources
Abstract
Planar Periodic Surface Lattice (PSL) structures of different configurations have been designed, fabricated and measured in the 140-220 GHz frequency band. Surface mode resonances are observed in ‘mesh’ PSL structures. We establish that, when mounted on suitable metal-backed dielectric substrates, PSLs exhibit ‘mode-locked’ coherent cavity eigenmodes formed from coupled volume and surface modes. The ‘proof-of-principle’ coupling of volume and surface modes and concept of mode selection in a large cavity, which can lead to the innovation of high power mm-THz radiation sources, is demonstrated. Evidence of coupled eigenmode formation in a 0.64 mm planar PSL measured at 325-500 GHz is presented, verifying the scalability of this work. Excellent agreement between numerical modelling and experiment is reported.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 01, 2018
- Source ID
- 10.1063/1.5020542
Entities
People
- A. J. MacLachlan
- A. W. Cross
- Alan D. R. Phelps
- C. W. Robertson
Organizations
- Air Force Office of Scientific Research
- Engineering and Physical Sciences Research Council
- University of Strathclyde