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Experimental characterization of Spherical Bragg Resonators for electromagnetic emission engineering at microwave frequencies

Jean‐Jacques Laurin and Raman Kashyap

Article (2023)

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This work reports experimental investigation and numerical validation of millimeter-sized Spherical Bragg Resonators (SBRs) fabricated using 3D printing technology. The frequency dependencies of the reflection and transmission coefficients were analyzed, and eigenfrequency values were calculated to examine the density of photonic states in air/PLA-polylactide SBRs, showing the appearance of an eigenmode and an increase in the local density of states in the core of a defect cavity. A decay rate enhancement of ∼10² was obtained for a dipole placed in the core of the defect SBR. The study also investigated the influence of the source position on the resonator's electromagnetic wave energy. Scattering efficiencies up to order twelve of the multipole electric and magnetic contribution in a 10-layer SBR were calculated to validate the presence of the resonant modes observed in the scattering measurements performed for parallel and perpendicular polarizations. The results demonstrate that SBRs can act as omnidirectional cavities to enhance or inhibit spontaneous emission processes by modifying the density of electromagnetic states compared to free space. This finding highlights the potential of SBRs engineering spontaneous electromagnetic emission processes in various applications, including dielectric nanoantennas, optoelectronics devices, and quantum information across the entire electromagnetic spectrum.

Subjects: 3100 Physics > 3100 Physics
Department: Department of Electrical Engineering
Department of Engineering Physics
Research Center: POLY-GRAMES - Advanced Research Centre in Microwaves and Space Electronics
Funders: Natural Sciences and Engineering Research Council of Canada
PolyPublie URL: https://publications.polymtl.ca/56761/
Journal Title: Scientific Reports (vol. 13, no. 1)
Publisher: Nature Portfolio
DOI: 10.1038/s41598-023-47059-y
Official URL: https://doi.org/10.1038/s41598-023-47059-y
Date Deposited: 25 Mar 2024 14:50
Last Modified: 05 Apr 2024 20:02
Cite in APA 7: Laurin, J.‐J., & Kashyap, R. (2023). Experimental characterization of Spherical Bragg Resonators for electromagnetic emission engineering at microwave frequencies. Scientific Reports, 13(1), 20532 (10 pages). https://doi.org/10.1038/s41598-023-47059-y


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