Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Katsuhiko Miyamoto, Bong Joo Kang, Won Tae Kim, Yuta Sasaki, Hiromasa Niinomi, Koji Suizu, Fabian Rotermund, Takashige Omatsu

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Optical vortex, possessing an annular intensity profile and an orbital angular momentum (characterized by an integer termed a topological charge) associated with a helical wavefront, has attracted great attention for diverse applications due to its unique properties. In particular for terahertz (THz) frequency range, several approaches for THz vortex generation, including molded phase plates consisting of metal slit antennas, achromatic polarization elements and binary-diffractive optical elements, have been recently proposed, however, they are typically designed for a specific frequency. Here, we demonstrate highly intense broadband monocycle vortex generation near 0.6 THz by utilizing a polymeric Tsurupica spiral phase plate in combination with tilted-pulse-front optical rectification in a prism-cut LiNbO 3 crystal. A maximum peak power of 2.3 MW was obtained for THz vortex output with an expected topological charge of 1.15. Furthermore, we applied the highly intense THz vortex beam for studying unique nonlinear behaviors in bilayer graphene towards the development of nonlinear super-resolution THz microscopy and imaging system.

Original languageEnglish
Article number38880
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Dec 14
Externally publishedYes

ASJC Scopus subject areas

  • General

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