Effect of Geometry, Joule Heating, and Critical Current on the Responsivity of MOD Superconducting Transition Edge Senso
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O R I G I N A L PA P E R
Effect of Geometry, Joule Heating, and Critical Current on the Responsivity of MOD Superconducting Transition Edge Sensors Mehdi Hosseini · Ali Moftakharzadeh · Alireza Kokabi · Mohammad Ali Vesaghi · Mehdi Fardmanesh
Received: 8 November 2012 / Accepted: 30 November 2012 / Published online: 13 December 2012 © Springer Science+Business Media New York 2012
Abstract By fabrication of several bolometric detectors on the YBCO film made of Metal-Organic Deposition (MOD) and the effect of pattering and film parameters on the optical responsivity of transition edge sensors is investigated. The low cost nonfluorine (MOD) method has been applied to fabricate YBCO thin films with different patterning parameters. The measurement results of the optical responsivity versus modulation frequency up to 100 KHz for these devices are reported. Keywords YBCO thin film · Metal-organic deposition (MOD) · Bolometer
1 Introduction Optical sensitivity optimization is a critical challenge in the design and application of optical detectors. In the range of infrared radiation, superconductor bolometric sensors are one of the most sensitive types of detectors. Therefore, optimization of the involving parameters to obtain the maximum optical detectivity of these devices is a considerable practical issue, which has been focused by many groups [1–4].
M. Hosseini · M.A. Vesaghi Physics Department, Sharif University of Technology, P.O. Box 11365-9363, Tehran, Iran A. Moftakharzadeh Department of Electrical Engineering, Yazd University, P.O. Box 89195-741, Yazd, Iran A. Kokabi () · M. Fardmanesh School of Electrical Engineering, Sharif University of Technology, P.O. Box 11365-9363, Tehran, Iran e-mail: [email protected]
The effect of geometry dependent parameters on the responsivity of superconducting transition edge sensors is previously investigated [5]. The effect of nonuniformity of device surface and pattern track to the spacing ratio has been investigated theoretically. It is shown that the maximum optical responsivity occurs at a specific track to the spacing ratio of the device pattern. Therefore, consideration of device geometry and patterning is inevitable in the fabrication of a high sensitive bolometer, which is necessary in practical applications. Motivated by this importance, we experimentally investigate the effect of pattern specifications on the optical responsivity of the device. The YBCO thin film for device patterning is fabricated by the nonvacuum Metal Organic Deposition (MOD) method. This method with two main different processes (TFA-MOD and MOD-acac) is developed for synthesis of high quality large-scale thin films [6–11]. Producing the high quality and the large area samples make the MOD an interesting method for the fabrication of the superconducting optical device such as transition-edge sensors. Furthermore, the low cost mass production capability is another advantage of the MOD method, which makes it easy to fabricate several devices with different design parameters. Due to these adva
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