Absorption-induced transmission in plasma microphotonics

Baheej Bathish, Raanan Gad, Fan Cheng, Kristoffer Karlsson, Ramgopal Madugani, Mark Douvidzon, Síle Nic Chormaic and Tal Carmon ()
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Baheej Bathish: Technion-Israel Institute of Technology
Raanan Gad: Tel Aviv University
Fan Cheng: Tel Aviv University
Kristoffer Karlsson: Okinawa Institute of Science and Technology Graduate University
Ramgopal Madugani: Okinawa Institute of Science and Technology Graduate University
Mark Douvidzon: Technion-Israel Institute of Technology
Síle Nic Chormaic: Okinawa Institute of Science and Technology Graduate University
Tal Carmon: Tel Aviv University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Ionised gas, i.e., plasma, is a medium where electrons-ions dynamics are electrically and magnetically altered. Electric and magnetic fields can modify plasma’s optical loss, refraction, and gain. Still, plasma’s low pressure and large electrical fields have presented as challenges to introducing it to micro-cavities. Here we demonstrate optical microresonators, with walls thinner than an optical wavelength, that contain plasma inside them. By having an optical mode partially overlapping with plasma, we demonstrate resonantly enhanced light-plasma interactions. In detail, we measure plasma refraction going below one and plasma absorption that turns the resonator transparent. Furthermore, we photograph the plasma’s micro-striations, with 35 μm wavelength, indicating magnetic fields interacting with plasma. The synergy between micro-photonics and plasma might transform micro-cavities, and electro-optical interconnects by adding additional knobs for electro-optically controlling light using currents, electric-, and magnetic-fields. Plasma might impact microphotonics by enabling new types of microlasers and electro-optical devices.

Date: 2023
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DOI: 10.1038/s41467-023-40205-0

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