Selective spectral detection of continuum terahertz radiation
2010
The knowledge of THz continuum spectra is essential to investigate the emission mechanisms by high energy particle
acceleration processes. Technical challenges appear for obtaining selective spectral sensing in the far infrared range to
diagnose radiation produced by solar flare burst emissions measured from space as well as radiation produced by high
energy electrons in laboratory accelerators. Efforts are been carried out intended for the development of solar flare high
cadence radiometers at two THz frequencies to operate outside the terrestrial atmosphere (i.e. at 3 and 7 THz). One
essential requirement is the efficient suppression of radiation in the visible and near infrared. Experimental setups have
been assembled for testing (a) THz transmission of "low-pass" filters: rough surface mirrors; membranes Zitex G110G
and TydexBlack; (b) a fabricated 2.4 THz resonant grid band-pass filter transmission response for polarization and angle
of incidence; (c) radiation response from distinct detectors: adapted commercial microbolometer array using HRFZ-Si
window, pyroelectric module and Golay cell; qualitative detection of solar radiation at a sub-THz frequency has been
tested with a microbolometer array placed at the focus of the 1.5 m reflector for submillimeter waves (SST) at El
Leoncito, Argentina Andes.
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