94&nbsp;GHz microplasma sustained by a photonic crystal

Hopwood, Jeffrey

doi:10.1088/1361-6595/ac3213

94 GHz microplasma sustained by a photonic crystal

Journal Article · Fri Nov 19 00:00:00 EST 2021 · Plasma Sources Science and Technology

DOI:https://doi.org/10.1088/1361-6595/ac3213· OSTI ID:1847932

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Tufts Univ., Medford, MA (United States); Tufts University

A photonic crystal (PhC) with a single vacancy sustains an argon microplasma at 94 GHz. The PhC consists of a 7 × 13 array of small alumina rods, each 250 μm in radius. The PhC has a forbidden bandgap from 70–105 GHz. The vacancy creates an internal electromagnetic resonance at 94 GHz that intensifies the electric field of an incident wave to 5 × 10⁵ V m^–1. Breakdown of low-pressure argon gas (80 mbar) occurs and forms a stable, ellipsoidal plasma inside the crystal. The central core of the microplasma is probed using a 200 μm optical fiber inserted into the PhC. The rotational temperature of the CH molecule is estimated from a numerical fit of the plasma emission and is found to increase from 450–650 K with both pressure (200–1000 mbar) and incident wave power (100 mW–1100 mW). Under these conditions, the electron density increases with both power and pressure from 0.5–1.5 × 10²⁰ m^–3. Furthermore, this plasma density range brackets the electron plasma frequency at 94 GHz. The results are compared with a similar microplasma operating at 44 GHz.

View Accepted Manuscript (DOE)

Research Organization:: Tufts Univ., Medford, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0021249

OSTI ID:: 1847932

Journal Information:: Plasma Sources Science and Technology, Journal Name: Plasma Sources Science and Technology Journal Issue: 11 Vol. 30; ISSN 0963-0252

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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