Exceptional points (EPs) in non-Hermitian systems are drawing attention for their ability to enhance light-matter interactions. Here we explore the EP’s contribution to the electro-optic tunability, modulation and nonreciprocal responses.
Here we implement fully mechanically stable and electro-optically tunable EP system, with two lithographically defined asymmetric Mie scatterers and electro-optic tuning phase and amplitude. These scatterers disrupt rotational symmetry and enable dynamic tuning across a chiral EP using a nanoscale local heater. This setup allows for precise, phase-sensitive control of coupling between clockwise (CW) and counterclockwise (CCW) modes, leading to enhanced electro-optic amplitude modulation.
Dr. Lee, the first author, discussed his enthusiasm for the work:
“Our approach makes major strides in chiral silicon photonics for several reasons. Firstly, we developed a nano-heater aligned to one arm of the micro-resonator, achieving highly localized heating rather than heating the entire ring. Addressing the challenge posed by a large thermal diffusion length (>10 µm), this innovation allows for deterministic, dynamic tuning of chirality. Secondly, our precise phase-only control enables unique inter-scatter phase tuning, enhancing electro-optic amplitude modulation in ways never previously predicted or observed.”
“Finally, this chiral electro-optic modulator could revolutionize photonic integrated circuits, reducing energy consumption and simplifying circuit design. Potential applications span neuromorphic computing, secure quantum networks, and advanced sensors for smart infrastructure.”
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References
DOI
10.1038/s41377-024-01657-1
Original Source URL
https://doi.org/10.1038/s41377-024-01657-1
Funding information
This research was supported by the Defense Advanced Research Projects Agency (N660012114034) and AFOSR (FA9550-18-1-0300). S.K.Ö. received support from the AFOSR Multi-University Research Initiative (FA9550-21-1-0202) and grant FA9550-18-1-0235. A.A. acknowledges the Vannevar Bush Faculty Fellowship, the Air Force Office of Scientific Research MURI program, and the Simons Foundation.
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The Light: Science & Applications will primarily publish new research results in cutting-edge and emerging topics in optics and photonics, as well as covering traditional topics in optical engineering. The journal will publish original articles and reviews that are of high quality, high interest and far-reaching consequence.