Title :
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
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;
Conference_Titel :
Infrared Millimeter and Terahertz Waves (IRMMW-THz), 2010 35th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4244-6655-9
DOI :
10.1109/ICIMW.2010.5612389
