Tunable Three-Dimensional Photonic Crystal Microwave Resonator with Ultra-Small Mode Volume
Name
chotrattanapituk-c_earth-SB-physics-2021-thesis.pdf
Description
Thesis PDF
Size
49.93 MB
Format
Adobe PDF
Checksum (MD5)
3795b819b8375a9dd0d7535b4483e997
Author(s)
Chotrattanapituk, Abhijatmedhi
Advisor(s)
Englund, Dirk R.
Formaggio, Joseph A.
Date Issued
June 2021
Publisher
Massachusetts Institute of Technology
Abstract
Microwave resonator is an important electromagnetic tool with applications in many areas, including communication, nonlinear optics, cavity quantum electrodynamics, and precision metrology. In this work, we did simulations and experiments on a design of three-dimensional (3D) dielectric photonic crystal (PhC) cavity (PhCC) based on ABCD woodpile structure. Low material loss of the dielectric and radiation loss suppression of the 3D PhCโs complete bandgap give PhCC high quality factor (๐). The design also includes field focusing structure into the PhCC to achieve ultrasmall effective mode volume (๐โ subscript ๐๐). Moreover, the topology of the woodpile structure allows us to tune the PhCCโs resonance frequency as well.
Our simulation results agree with the experimentsโ on the band structure of the PhC, ๐, and the tunability of the PhCC. Furthermore, the simulation shows that we can achieve indefinitely small ๐โ subscript ๐๐ by the field focusing structure limited only by the fabrication resolution. Our experiments on the designโs 6 ร 6 ร 5 unit-cell PhCC demos give a complete bandgap between 3.6 GHz and 4.1 GHz. We measured their ๐ to be in the order of 10ยฒ for the resonance inside the complete bandgap regardless of the existence of the field focusing structure which normally cause high radiation loss. We also can tune the resonance of the PhCC up to 64% of the width of the complete bandgap.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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