Voltage-controlled Polarization and Cavity Modes in Integrated Superconducting Coherent Terahertz Emitters

Xiong, Y., Kashiwagi, T., Klemm, R. A., Kadowaki, K. and Delfanazari, K. (2021) Voltage-controlled Polarization and Cavity Modes in Integrated Superconducting Coherent Terahertz Emitters. 12th International Conference on Intrinsic Josephson Effect and Horizons of Superconducting Spintronics, Chişinău, Moldova, 22-25 Sep 2021. p. 70. ISBN 9789975472159

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Publisher's URL: https://ibn.idsi.md/vizualizare_articol/152206


Solid-state, compact and integrated terahertz (THz) devices based on high-Tc superconducting Bi2Sr2CaCu2O8+δ (BSCCO) can coherently and continuously radiate electromagnetic waves with frequencies tunable between 100 GHz and 11 THz. The high power cw THz wave can be observed by the application of an applied voltage of as small as Vdc (V) <1.5 through the device plane. The frequency tunability of such chip-scale quantum devices spans the entire THz gap. Here, we report on a novel approach towards control of THz waves in superconducting THz emitters with pentagonal cavities. We perform numerical simulations/analytical calculations and study their cavity resonances and linear to circular polarization. We engineer the radiation of the intense and coherent THz waves in pentagonal emitters in various ways and compare them with experimental results. We also control the cavity modes and polarization by fixing the bias feed point and changing the device geometry.figureFig. 1. (a) A false color scanning ion microscope image of the superconducting THz emitter with regular pentagonal cavity. The electrical bias feed line is located in the middle of the device. Sketch of the pentagonal THz devices together with the electric field Ez map at f = 0.46 THz., for (b) regular pentagonal geometry similar to that fabricated THz device shown in (a), (c) for regular pentagonal cavity with two rounded edges, and (d) for regular pentagonal cavity with all rounded edges. In (b-d) a single-feed point is chosen to be in the center.

Item Type:Conference or Workshop Item
Glasgow Author(s) Enlighten ID:Xiong, Yusheng and Delfanazari, Dr Kaveh
Authors: Xiong, Y., Kashiwagi, T., Klemm, R. A., Kadowaki, K., and Delfanazari, K.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Published Online:18 March 2022
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