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

doi:10.1038/srep38880

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 journal › Article › peer-review

28 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 language	English
Article number	38880
Journal	Scientific reports
Volume	6
DOIs	https://doi.org/10.1038/srep38880
Publication status	Published - 2016 Dec 14
Externally published	Yes

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title = "Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate",

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.",

author = "Katsuhiko Miyamoto and Kang, {Bong Joo} and Kim, {Won Tae} and Yuta Sasaki and Hiromasa Niinomi and Koji Suizu and Fabian Rotermund and Takashige Omatsu",

note = "Funding Information: The authors acknowledge a Grant-in-Aid for Scientific Research (Nos JP 15H03571, 15K13373 and JP 16K04971) from the Japanese Society for the Promotion of Science, as well as aid from the Industry-Academia Collaborative R&D Program of the Japanese Science and Technology Agency, the National Research Foundation of Korea (NRF) funded by Korea Government (MSIP) (2016R1A2A1A05005381), and the Center for Advanced Meta-Materials (CAMM) funded by Korea Government (MSIP) as a Global Frontier Project (CAMM-2014M3A6B3063709). Publisher Copyright: {\textcopyright} 2016 The Author(s).",

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AU - Miyamoto, Katsuhiko

AU - Kang, Bong Joo

AU - Kim, Won Tae

AU - Sasaki, Yuta

AU - Niinomi, Hiromasa

AU - Suizu, Koji

AU - Rotermund, Fabian

AU - Omatsu, Takashige

N1 - Funding Information: The authors acknowledge a Grant-in-Aid for Scientific Research (Nos JP 15H03571, 15K13373 and JP 16K04971) from the Japanese Society for the Promotion of Science, as well as aid from the Industry-Academia Collaborative R&D Program of the Japanese Science and Technology Agency, the National Research Foundation of Korea (NRF) funded by Korea Government (MSIP) (2016R1A2A1A05005381), and the Center for Advanced Meta-Materials (CAMM) funded by Korea Government (MSIP) as a Global Frontier Project (CAMM-2014M3A6B3063709). Publisher Copyright: © 2016 The Author(s).

PY - 2016/12/14

Y1 - 2016/12/14

N2 - 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.

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

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