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Open Access Nano Express

2D array of cold-electron nanobolometers with double polarised cross-dipole antennas

Leonid S Kuzmin

Author affiliations

Chalmers University of Technology, Gothenburg, S-41296, Sweden

Citation and License

Nanoscale Research Letters 2012, 7:224  doi:10.1186/1556-276X-7-224

Published: 18 April 2012

Abstract

A novel concept of the two-dimensional (2D) array of cold-electron nanobolometers (CEB) with double polarised cross-dipole antennas is proposed for ultrasensitive multimode measurements. This concept provides a unique opportunity to simultaneously measure both components of an RF signal and to avoid complicated combinations of two schemes for each polarisation. The optimal concept of the CEB includes a superconductor-insulator-normal tunnel junction and an SN Andreev contact, which provides better performance. This concept allows for better matching with the junction gate field-effect transistor (JFET) readout, suppresses charging noise related to the Coulomb blockade due to the small area of tunnel junctions and decreases the volume of a normal absorber for further improvement of the noise performance. The reliability of a 2D array is considerably increased due to the parallel and series connections of many CEBs.

Estimations of the CEB noise with JFET readout give an opportunity to realise a noise equivalent power (NEP) that is less than photon noise, specifically, NEP = 4 10−19 W/Hz1/2 at 7 THz for an optical power load of 0.02 fW.

Keywords:
Cold-electron bolometer; 2D array; Focal plane antenna; SIN tunnel junction; Andreev contact; JFET readout; 85.25.Oj; 85.25.Pb; 74.50. + r