SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Semiconductor Lasers

HL 7.2: Talk

Tuesday, September 28, 2021, 10:30–10:45, H4

Extraction of silver permittivity at cryogenic temperatures through the optical characterization of Ag-coated plasmonic nanolasers — •Georgios Sinatkas^1,2, Aris Koulas-Simos², Jianxing Zhang³, Jia-Lu Xu³, Cun-Zheng Ning^3,4, and Stephan Reitzenstein² — ¹School of Physics, Aristotle University of Thessaloniki, 54124, Greece — ²Institut für Festköperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany — ³Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China — ⁴School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287, USA

Plasmonic nanolasers hold great promise for compact, low threshold opto-electronic devices [1, 2]. For the development and design of such lasers, often operating at cryogenic temperatures, it is important to know the temperature dependence of the involved materials with high accuracy. Here, we report the extraction of silver permittivity in the range 10 K–230 K by performing temperature-dependent µPL measurements in conjunction with numeric simulations on silver-coated nanolasers in the near-infrared regime. By mapping the changes in Q-factor, measured at transparency, into silver-loss variations, we extract the imaginary part of silver permittivity, estimating an order of magnitude shift in the examined temperature range. This data is missing from the literature and it could be useful for theoretically validating experimental observations and evaluating thermal effects.

[1] S. I. Azzam et al., Light: Science & Applications 9(1) (2020).

[2] S. Kreinberg et al., Laser Photonics Rev. 14(12), 2000065 (2020).