This inventor holds 1 USPTO granted patent. Top assignee: Ntt Corporation. Active years: 2026.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
Years Active: 2026
Title: Koji Yamada and Optical Nonlinearity Measurement
Introduction
Koji Yamada is an inventor based in Musashino, Japan, and works at NTT Corporation. His patent work includes a method for measuring the optical nonlinearity of two-dimensional materials.
Latest Patents
Yamada is associated with 1 patent, titled “Measuring Method for Optical Nonlinearity of Two-Dimensional Material.” The method uses photon pairs generated through spontaneous four-wave mixing in an optical waveguide loaded with a two-dimensional material. It fits a theoretical coincidence rate, calculated using coupled wave equations, to the measured rate while varying the length of the material attached to the waveguide. This approach is designed to assess nonlinear coefficients while reducing the direct influence of free carriers compared with the Z-scan method.
Career Highlights
Yamada’s listed invention focuses on characterizing the optical properties of two-dimensional materials through photon-pair measurements. The patent describes a measurement setup that accounts for the structure of the material-loaded optical waveguide.
Collaborations
The patent lists Hidetaka Nishi and Yuya Yonezu among Yamada’s coworkers.
Conclusion
Koji Yamada’s patent work at NTT Corporation addresses optical nonlinearity measurement in two-dimensional materials using photon-pair generation and waveguide-based analysis.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile