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Related Experiment Video

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Practical photonic bandgap structures for high frequency axion haloscopes.

D Goulart¹, A M Sindhwad¹, H M Jackson¹

¹Department of Nuclear Engineering, University of California, Berkeley, Berkeley, California 94720, USA.

The Review of Scientific Instruments

|September 8, 2025

Summary

Future dark matter axion searches face challenges with resonator design above 5 GHz. A novel photonic bandgap structure suppresses unwanted modes, enabling sensitive searches in the post-inflationary axion mass range.

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Area of Science:

Experimental physics
Particle astrophysics
Photonics

Background:

Searches for dark matter axions utilize resonant conversion to photons within magnetic fields.
Designing high-frequency (≥5 GHz) resonators is hindered by the proliferation of transverse electric (TE) modes.
These TE modes interfere with the desired transverse magnetic (TM010) mode, complicating axion detection.

Purpose of the Study:

To address the challenge of TE mode proliferation in high-frequency axion detection resonators.
To enable the design of tunable resonators for future dark matter axion searches.
To explore novel resonator geometries for enhanced sensitivity in the post-inflationary axion mass range.

Main Methods:

Design and simulation of a photonic bandgap (PBG) structure.
Integration of the PBG structure into a circular resonator geometry.
Analysis of the PBG structure's effect on the transverse electric (TE) and transverse magnetic (TM) mode spectra.

Main Results:

Demonstrated complete suppression of the TE mode spectrum using a PBG structure.
Achieved TE mode suppression with minimal lattice periods (two or one), deviating from perfect lattice symmetry.
Enabled the design of tunable resonators in a volumetrically efficient circular geometry.

Conclusions:

Photonic bandgap structures offer a viable solution to TE mode proliferation in high-frequency axion detectors.
This approach facilitates the development of sensitive, tunable resonators for future dark matter axion searches.
The proposed method opens avenues for exploring the post-inflationary axion mass range effectively.