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Terahertz Scanning Array Radiometers

#4030


Ultrasensitive Terahertz Range Radiometers of Sub-Diffraction Resolution with Receiving Arrays Based on the Superconducting Hot-Electron Nanobolometers-Sensors and the Procedure for Scanning and Reconstruction of Received Images

Tech Area / Field

  • INF-SIG/Sensors and Signal Processing/Information and Communications
  • INF-ELE/Microelectronics and Optoelectronics/Information and Communications
  • INS-DET/Detection Devices/Instrumentation
  • SAT-AST/Astronomy/Space, Aircraft and Surface Transportation

Status
3 Approved without Funding

Registration date
05.02.2010

Leading Institute
Russian Academy of Sciences / Institute of Radioengineering and Electronics, Russia, Moscow

Supporting institutes

  • Joint Institute of Nuclear Research, Russia, Moscow reg., Dubna

Collaborators

  • IPHT Jena e. V., Germany, Jena\nState University of New York at Stony Brook / Department of Physics and Astronomy, USA, NY, Stony Brook\nEuropean Space Agency, The Netherlands, Noordwijk

Project summary

The proposed project is aimed at investigations and developments of the supersensitive terahertz frequency range (0.3 – 10 THz) receiving arrays based on hot-electron superconducting nanobolometers-sensors, input optics of radiometers with such receiving arrays realizing image scanning, and received signal acquisition system with subsequent computer reconstruction of observed image measured data being filtered substantially off diffractional diffusion. To achieve the indicated above aim the following investigations and development will be fulfilled.
  1. The improvement of fabrication technology based on electron-beam and optical lithography will be fulfilled. It will be oriented to fabrication of terahertz integrated microcircuits with superconducting nanobolometers with thicknesses 20 – 40 nm and transverse dimensions down to 10 × 1 μm2 (first stage) and down to 1 μm × 100 nm (second stage), circuits feeding in to nanobolometers detected radiation and bias as well as reading out detected signals from them. First dimensions are aimed at the achievement of NEP’s ≈ 10-17 – 10-18 W/Hz1/2 what is quite enough for ground based applications and second – at the achievement of NEP’s ≈ 10-19 – 10-20 W/Hz1/2 and better what is necessary for the space applications.
  2. The investigation and development of receiving elements on the basis of immersion lenses and mentioned above terahertz integrated microcircuits with superconducting nanobolometers immersed in them will be fulfilled. The investigation and development of such receiving elements with interconnections for the feeding in bias to nanobolometers and the reading out from them and multiplexing detected signals will be fulfilled as well.
  3. The development and fabrication of measurement test-bed on the basis of terahertz cooled sweeped blackbody radiation source and providing measurements of spectral characteristics and NEP’s of receiving elements and arrays of them using the test-bed will be fulfilled.
  4. The theoretical investigation of the method of optical (quasioptical) image scanning at the terahertz radiometer input using two-dimensional receiving arrays with subsequent computer reconstruction of observed image aimed at the overcoming of radiation diffractional diffusion of observed image will be fulfilled. The noise of receiving scheme and environment will be taken into account. The accommodation of the test-bed with small scanning telescope and the carrying out the experimental investigation of named method with the purpose of verification of theory conclusion will be fulfilled as well. The estimation of a possibility of method implementation for space telescope FIRI of European Space Agency will be made.


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