Effect of Substrate Thickness on Responsivity of Free-Membrane Bolometric Detectors

Abstract

The effect of substrate thickness and its Debye temperature on the bolometric response of the freestanding-membrane type of superconductor transition-edge detectors is investigated. The investigation is based on the calculation of the variation of the specific heat per unit volume and the heat conductivity using the finite-size scaling method for different Debye temperatures and micron size thickness of substrate. We also calculated the heat capacity and time constant for various materials with Debye temperatures in the range of 600-1400 K. The calculated results are compared with previously reported response values obtained theoretically and experimentally for the thermal-based infrared (IR) detectors. The IR response versus substrate thickness of these types of devices for different modulation frequencies is also presented. This inspected response at low thicknesses of substrate shows anomalistic behavior with respect to the previously reported results of response analyses. Here, we also obtained the optimized substrate thickness and Debye temperatures for maximum responsivity of these types of devices.Index Terms-Finite size effect, responsivity, superconductor bolometer.

Millimeter-Wave Response of All Metal-Organic Deposited YBCO Transition Edge Bolometer

“…where η is the ratio of the absorbed power to the irradiated power, I b is the bias current, G is the device total thermal conductance, τ = C/G is the time constant of the bolometer, and C is the total heat capacity. Controlling thermal parameters of these detectors can significantly improve their responsivity [21]- [25]. Besides engineering the thermal parameters, the optical properties of the device play an important role in the absorption η and consequently, the responsivity of the device for the target wavelength [26]- [28].…”

Anti-reflective MX (M = Sc and Y; X = N, P, As, Sb and Bi) monolayers: structural, electronic and optical study

“…To check the dynamical stability of the monolayer, the phonon dispersions were calculated using density functional perturbation theory as implemented in QUANTUM ESPRESSO package. Martin-Troullier normconserving pseudopotential is used to treat the core electron [56][57][58].…”

Three-dimensional analysis of bolometers responsivity using Green functions

“…Generally, a superconducting bolometer for infrared radiation consists of thin-film meanders of a superconducting material on an insulating substrate which is attached to a heat sink [13]. Many works have been focused on the response optimization of this type of detectors both theoretically and experimentally [14][15][16][17][18]. Due to the improvement of thin-film fabrication techniques, the low-cost large-scale fabrication method is now available and therefore the structural optimization of the sensor plays an important role during fabrication [15][16][17][18][19].…”

“…Many works have been focused on the response optimization of this type of detectors both theoretically and experimentally [14][15][16][17][18]. Due to the improvement of thin-film fabrication techniques, the low-cost large-scale fabrication method is now available and therefore the structural optimization of the sensor plays an important role during fabrication [15][16][17][18][19].…”