Nanoscale chiral surface relief of azo-polymers with nearfield OAM light

Keigo Masuda, Ryo Shinozaki, Yoshinori Kinezuka, Junhyung Lee, Seigo Ohno, Shun Hashiyada, Hiromi Okamoto, Daisuke Sakai, Kenji Harada, Katsuhiko Miyamoto, Takashige Omatsu

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

An optical vortex with orbital angular momentum (OAM) can be used to induce microscale chiral structures in various materials. Such chiral structures enable the generation of a nearfield vortex, i.e. nearfield OAM light on a sub-wavelength scale, thereby leading to further nanoscale mass-transport. We report on the formation of a nanoscale chiral surface relief in azo-polymers due to nearfield OAM light. The resulting nanoscale chiral relief exhibits a diameter of ca. 400 nm, which corresponds to less than 1/5–1/6th of the original chiral structure (ca. 2.1 µm). Such a nanoscale chiral surface relief is established by the simple irradiation of uniform visible plane-wave light with an intensity of <500 mW/cm2.

Original languageEnglish
Pages (from-to)22197-22207
Number of pages11
JournalOptics Express
Volume26
Issue number17
DOIs
Publication statusPublished - 2018 Aug 20

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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