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High-Q, Size-Independent, and Reconfigurable Optical Antennas Embedded in Zero-Index Cavities.
Prasad P Iyer1,2, Mihir Pendharkar1,3, Anchal Agarwal1,4
1Electrical and Computer Engineering Department, University of California, Santa Barbara, California 93106, United States.
ACS Nano
|October 8, 2025
Summary
We embed Mie resonators in epsilon-near-zero (ENZ) materials to boost light-matter interactions. This approach enhances quality factors and optical reconfigurability for nanophotonic devices.
Area of Science:
- Nanophotonics
- Metasurfaces
- Plasmonics
Background:
- Enhancing light-matter interactions is key in nanophotonics.
- Epsilon-near-zero (ENZ) materials offer potential but face fabrication challenges.
- Mie resonances have low quality factors (Q-factors) due to material limitations.
Purpose of the Study:
- To overcome limitations of traditional nanophotonic approaches.
- To enhance Q-factors and optical reconfigurability of Mie resonators.
- To explore novel resonator-ENZ configurations for advanced optical devices.
Main Methods:
- Embedding Mie resonators within ENZ media.
- Utilizing novel epitaxial regrowth techniques.
- Investigating three configurations: voids in AlN, Ge in SiO2, and InSb in doped InSb.
Main Results:
- Achieved significant Q-factor improvements over non-embedded resonators.
- Demonstrated an air-based Mie resonator in AlN with Q-factors > 100 and negligible dispersion.
- Showcased dynamic reconfigurability of InSb resonators via thermal tuning of ENZ wavelength.
Conclusions:
- Embedding Mie resonators in ENZ media enhances Q-factors and reconfigurability.
- This approach mitigates fabrication challenges and geometric dispersion.
- Enables high-fidelity sensors, thermal emitters, and reconfigurable metasurfaces.
