A unidirectional subwavelength focusing near-field plate

Mohammadreza F. Imani, Anthony Grbic

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Near-field plates consist of non-periodically patterned surfaces that can overcome the diffraction limit and confine electromagnetic fields to subwavelength dimensions. Previous near-field plates experimentally demonstrated extreme field tailoring capabilities. However, their performance suffered from radiation/reflection in undesired directions, those other than the subwavelength focus. This issue can limit the practical use of near-field plates. In this paper, we address this issue by designing a unidirectional near-field plate that can form a subwavelength focal pattern, while suppressing the field radiated/reflected in other directions. The design and operation of the proposed unidirectional near-field plate are verified through full-wave simulation. The unidirectional near-field plate may find application in high resolution imaging and probing, high density data storage, and wireless power transfer systems. As an example, its utility as a high resolution probe is demonstrated through full-wave electromagnetic simulation.

Original languageEnglish (US)
Article number044904
JournalJournal of Applied Physics
Issue number4
StatePublished - Jan 28 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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