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Room temperature ultrafast InGaAs Schottky diode based detectors for terahertz spectroscopy

DOI: 10.1016/j.infrared.2019.01.014 DOI Help

Authors: Nart Daghestani (RAL Space, STFC Rutherford Appleton Laboratory) , Kai Parow-souchon (RAL Space, STFC Rutherford Appleton) , Diego Pardo (RAL Space, STFC Rutherford Appleton) , Hairui Liu (RAL Space, STFC Rutherford Appleton) , Nick Brewster (RAL Space, STFC Rutherford Appleton) , Mark Frogley (Diamond Light Source) , Gianfelice Cinque (Diamond Light Source) , Byron Alderman (RAL Space, STFC Rutherford Appleton Laboratory) , Peter G. Huggard (RAL Space, STFC Rutherford Appleton)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Infrared Physics & Technology

State: Published (Approved)
Published: January 2019
Diamond Proposal Number(s): 11395 , 8920

Abstract: The design and characterisation of rectifying terahertz detectors, based on InGaAs zero-bias Schottky diodes, is reported. These uncooled devices offer a spectral detection range from tens of GHz to above 3 THz, high response speed, and the prospect of low cost for mass production and arrayed implementation. We describe the airbridged semiconductor devices, their incorporation into waveguide mounts and quasi-optical substrate lens / planar antenna structures. Noise equivalent powers of 5 pW/Hz1/2 at 100 GHz, increasing to 50 pW/Hz1/2 at 300 GHz been achieved, along with rise and fall times of tens of picoseconds. We shall discuss examples of the use of the detectors: characterising a picosecond transistor-based source, spectrally narrow and broad band sources in the laboratory and coherent THz synchrotron radiation in the range 0.15 to 1.4 THz at the MIRIAM beamline B22 on the Diamond Light Source. The latter radiation was emitted from bunches of electrons circulating in the Diamond storage ring operating in THz-dedicated low-alpha mode. Spectral information on coherent synchrotron radiation originating from a single bunch of electrons is obtained, as well as the usefulness of this for spectroscopy, is evaluated.

Journal Keywords: Schottky diode detectors; zero bias detectors; InGaAs; coherent synchrotron radiation; terahertz; spectroscopy; Fourier Transform Infrared (FTIR)

Subject Areas: Technique Development, Physics

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy