Theoretical analysis of the microwave-drill near-field localized heating effect

E. Jerby*, O. Aktushev, V. Dikhtyar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The microwave-drill principle [Jerby et al., Science 298, 587 (2002)] is based on a localized hot-spot effect induced by a near-field coaxial applicator. The microwave drill melts the nonmetallic material locally and penetrates mechanically into it to shape the hole. This paper presents a theoretical analysis of the thermal-runaway effect induced in front of the microwave drill. The model couples the Maxwell's and heat equations including the material's temperature-dependent properties. A finite-difference time-domain algorithm is applied in a two-time-scale numerical model. The simulation is demonstrated for mullite, and benchmarked in simplified cases. The results show a temperature rise of ∼10 3 K/s up to 1300 K within a hot spot confined to a ∼4-mm width (∼0.1 wavelength). The input-port response to this near-field effect is modeled by equivalent time-varying lumped-circuit elements. Besides the physical insight, this theoretical study provides computational tools for design and analysis of microwave drills and for their real-time monitoring and adaptive impedance matching.

Original languageEnglish
Article number034909
JournalJournal of Applied Physics
Volume97
Issue number3
DOIs
StatePublished - 1 Feb 2005

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