Development of Microwave Kinetic Inductance Detectors for near-IR single photon counting

23 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector Development and Physics Poster session

Speaker

Dr Renato Mezzena (Dipartimento di Fisica, Università di Trento and INFN - TIFPA Trento)

Description

We have developed Microwave Kinetic Inductance Detectors suitable for near-IR single photon counting. Our films are made of titanium and titanium nitride, deposited in a multi-layer structure Ti/TiN/Ti/TiN with a total thickness of 44 nm. The film has a transition temperature of 1.2 K and a surface kinetic inductance of 34 pH/sq. The resonator was designed with lumped elements and consists of two blocks of interdigitated capacitors connected by a meandered stripe inductor of 128 μm$^3$. The resonator resonance frequency is 6.8 GHz and the internal quality factor is 125000. We have estimated the kinetic inductance fraction α=0.86 .The detector is read out with the usual homodyne scheme and has been calibrated with light pulses produced by a laser diode with wavelength 1550 nm. We measure a FWHM energy resolution = 0.44 eV which is sufficient to resolve events with up to 4 photons and is within a factor of two from the best value published in literature. In the next design we aim at a further improvement by reducing the inductor volume by about a factor of 10.

Student (Ph.D., M.Sc. or B.Sc.) N
Less than 5 years of experience since completion of Ph.D N

Primary author

Dr Renato Mezzena (Dipartimento di Fisica, Università di Trento and INFN - TIFPA Trento)

Co-authors

Dr Elena Ferri (Dipartimento di Fisica, Università di Milano-Bicocca and INFN Sezione di Milano Bicocca) Dr Marco Faverzani (Dipartimento di Fisica, Università di Milano-Bicocca and INFN Sezione di Milano Bicocca) Dr Andrea Giachero (Dipartimento di Fisica, Università di Milano-Bicocca and INFN Sezione di Milano Bicocca) Dr Benno Margesin (Fondazione Bruno Kessler (FBK) and INFN - TIFPA Trento) Prof. Angelo Enrico Lodovico Nucciotti (Dipartimento di Fisica, Università di Milano-Bicocca and INFN Sezione di Milano Bicocca ) Dr Andrei Puiu (Dipartimento di Fisica, Università di Milano-Bicocca and INFN Sezione di Milano Bicocca) Dr Andrea Vinante (Department of Physics and Astronomy, University of Southampton)

Presentation Materials