Three-dimensional direct observation of Gouy phase shift in a terajet produced by a dielectric cuboid

Hai Huy Nguyen Pham, Shintaro Hisatake, I. V. Minin, Oleg V. Minin, Tadao Nagatsuma

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The generation of the terajet at the terahertz (THz) frequency with the capability of subwavelength beam-compression has been attracting increasing research interest, as did the generation of the nanojet at the optical frequency. In particular, a terajet generated from a dielectric cuboid was not previously studied experimentally in the THz region. We here experimentally demonstrate three-dimensional visualizations and characterization of a terajet generated from a dielectric cuboid with a refractive index of n = 1.46 at 125 GHz. The subwavelength compressed beam and the Gouy phase shift phenomena of the terajet are directly observed. It is also found out that a calculation model of Gouy phase shift based on focused Gaussian beam by a lens cannot explain the Gouy phase shift of compressed beam by the terajet. The intensity enhancement of about 7.4 dB and full width at half maximum of 0.6λ are obtained at the distance 0.5λ from the cuboid.

Original languageEnglish
Article number191102
JournalApplied Physics Letters
Volume108
Issue number19
DOIs
Publication statusPublished - 9 May 2016
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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