High dynamic range, hyper-terahertz detection with silicon photoconductors
Abstract
The frequency response of ion implanted silicon photoconductive devices designed for coherent detection in time domain terahertz spectroscopy has been studied between 0.2 and 30 THz. Unlike devices using polar photoconductors or ones having polar substrates, which have a complicated response spectrum in the region of their reststrahlen bands, the response of silicon detectors fabricated on silicon substrates is relatively featureless. When used with amplified laser systems, the dynamic range of Si detectors is shown to be very similar to that of GaAs devices with the same geometry over a 20 THz range, superior to air-biased coherent detection (ABCD) at frequencies below ∼7 THz and comparable with both ABCD and electro-optic sampling in thin ZnTe crystals between 7 and 20 THz. Together with their ease of use and linear response in terahertz fields approaching 1 MV/cm, this suggests that Si photoconductors could be a competitive choice for sensitive detection in nonlinear hyper-terahertz spectroscopy.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 13, 2016
- Source ID
- 10.1063/1.4954029
Entities
People
- A. C. Muir
- A. Hussain
- S. R. Andrews
Organizations
- Air Force Office of Scientific Research
- Engineering and Physical Sciences Research Council
- Rutherford Appleton Laboratory
- University of Bath