2026-09-21T04:36:19Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/130223 2026-02-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

application/pdf en text Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01 The student, Zhenglun Wu, accepted the attached license on 2025-07-23 at 15:49. The student, Zhenglun Wu, submitted this Thesis for approval on 2025-07-23 at 16:41. This Thesis was approved for publication on 2025-07-24 at 10:27. DSpace SAF Submission Ingestion Package generated from Vireo submission #22713 on 2025-10-25 at 15:54:33 Dynamic control of plasma photonic crystals in the mm-wave region Wu, Zhenglun 2025-07-24 Eden, James Gary Plasma Photonic Crystals eng Photonic crystals (PCs) manipulate electromagnetic waves by comprising a periodic modulation of refractive index. However, once fabricated from solid dielectrics, their electromagnetic properties remain fixed. Plasma photonic crystals (PPCs) address this limitation by incorporating tunable plasma layers whose permittivity varies with electron density, allowing dynamic reconfiguration. With advanced microfabrication, microplasma columns can now be embedded directly within the crystal, reducing the period to sub-millimeter dimensions and pushing the operating band into the hundreds-of-GHz range. Consequently, such PPCs hold great promise as adaptable millimeter-wave components for future communication and spectroscopy systems. This thesis introduces the underlying theory of conventional PCs and microplasma, then experimentally investigates transmission measurements and optical emission spectroscopy. 2025-08 Text https://hdl.handle.net/2142/130223 Copyright 2025 Zhenglun Wu Electrical & Computer Eng Electrical & Computer Engr University of Illinois Urbana-Champaign M.S. Thesis