Optical characterization of a superconducting hotspot air-bridge bolometer

Author

Cibella, S. ; Ortolani, M. ; Chiarello, F. ; Leoni, R. ; Torrioli, G. ; Mahler, L. ; Xu, Ji-Hua ; Tredicucci, A. ; Beere, H.E. ; Ritchie, D.A.

Author_Institution

CNR, Ist. di Fotonica e Nanotecnol., Rome, Italy

fYear

2010

fDate

5-10 Sept. 2010

Firstpage

1

Lastpage

2

Abstract

A superconducting bolometer with an on-chip lithographic terahertz antenna has been characterized in passive and active mode. Direct detection measurements made with 300K/77K blackbody sources yeld an optical efficiency of 10%. Time response of the bolometer has been obtained at 2.5 and 4.4 THz by illuminating the detector with quantum cascade lasers (QCL) showing a time constant of 1.2 μs. Here we report on the fabrication and the optical characterization of an antenna-coupled hot-spot microbolometer operating in vacuum at liquid helium temperature.

Keywords

bolometers; quantum cascade lasers; terahertz spectroscopy; terahertz wave imaging; antenna-coupled hot-spot microbolometer; direct detection measurements; on-chip lithographic terahertz antenna; optical characterization; quantum cascade lasers; superconducting hotspot air-bridge bolometer; Antenna measurements; Antennas; Bolometers; Optical imaging; Optical pulses; Quantum cascade lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on

Conference_Location

Rome

Print_ISBN

978-1-4244-6655-9

Type

conf

DOI

10.1109/ICIMW.2010.5612389

Filename

5612389