Hokkaido Univ. Technology：Optical Vortex Generator and Analysis：HK25-001
Harnessing spiral light for measurement !
Chiral materials absorb right- and left-circularly polarized light differently (circular dichroism). Optical vortices, however, carry orbital angular momentum; their topological charge l can take unlimited integer values (±1, ±2, ±3, …). Using this richer degree of freedom enables material characterization, chirality discrimination, and a new measurement modality (“optical-vortex dichroism”) beyond conventional circular dichroism. Conventional vortex generators are limited to low-frequency modulation, leading to high noise and poor S/N. The invention engineers the optical system to achieve left–right vortex modulation at high frequency, reducing noise. We demonstrate detection of the “geometric twist” in twisted gold nanorod dimers (TND: paired, twisted nanoscale rods), suggesting defect detection in fine metallic wiring and applications in semiconductor, MEMS, and metamaterial inspection, as well as discovering new properties and enabling chirality identification.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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