Optical vortex pulse illumination to create chiral monocrystalline silicon nanostructures. Issue 4 (3rd December 2015)

• Record Type: Journal Article
• Authors: Takahashi, Fuyuto; Takizawa, Shun; Hidai, Hirofumi; Miyamoto, Katsuhiko; Morita, Ryuji; Omatsu, Takashige
• Is Part Of: Physica status solidi. Volume 213:Issue 4(2016:Apr.)
• Page Start: 1063
• Page End: 1068
• Publication Date: 2015-12-03
• Subjects: chiral structured materials -- laser materials processing -- nanostructures -- optical angular momentum -- optical vortices -- silicon; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201532661
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : We discovered that a nanosecond optical vortex pulse can create a chiral cone‐shaped monocrystalline silicon (Si) nanostructure (chiral Si nanocone) by transferring its optical angular momentum to a monocrystalline Si substrate. The fabricated Si nanocone, with a length of 4.8 µm and a tip curvature of ∼110 nm, was fully monocrystalline, and it had a spiral structure with an 86 nm line width on a conical surface. Furthermore, its chirality was also determined directly from the handedness of the optical vortex pulse. Such chiral Si nanocones may enable the development of novel silicon photonic devices as well as ultra‐highly efficient photovoltaic devices.