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

28 Citations (Scopus)


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
Issue number17
Publication statusPublished - 2018 Aug 20

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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