Impedance measurements for photon number resolving Transition-Edge Sensors

E. Taralli; C. Portesi; L. Lolli; M. Rajteri; E. Monticone; I. Novikov; J. Beyer

doi:10.1140/epjp/i2012-12013-3

EPJ

Impedance measurements for photon number resolving Transition-Edge Sensors

E. Taralli¹, C. Portesi¹^*, L. Lolli¹^,2, M. Rajteri¹, E. Monticone¹, I. Novikov³ and J. Beyer⁴

¹ Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, I-10129, Torino, Italy
² Politecnico di Torino (DISPEA), C.so Duca degli Abruzzi 24, I-10129, Torino, Italy
³ Novosibirsk State Technical University (NSTU), K. Marx Avenue 20, 630092, Novosibirsk, Russia
⁴ Physikalisch-TechnischeBundesanstalt (PTB), Abenstrasse 2-12, D-10587, Berlin, Germany

Received: 17 May 2011
Revised: 22 December 2011
Accepted: 3 January 2012
Published online: 6 February 2012

Abstract

The complex impedance measurement technique is an established method for the characterisation of Transition-Edge Sensors (TES) bolometers and microcalorimeters. In this report this technique is applied at frequencies up to 250kHz to Ti/Pd and Ti/Au Transition-Edge Sensors, in the optical and near-infrared wavelength range, to obtain a complete frequency response in the complex plane. From these measurements we obtain information about the logarithmic temperature sensitivity α, the logarithmic current sensitivity β and on the device thermal parameters, heat capacity C, thermal conductance G and the effective response time τ _eff. All these parameters provide a reasonable understanding of the two different detectors and a discussion about the main differences is also reported.