This inventor holds 3 USPTO granted patents. Top assignees: Tdk Corporation, Kyoto University. Active years: 2008-2009.
Location History:
- Chuo, JP (2008)
- Chuo-ku, JP (2009)
Company Filing History:
3 out of 8,238 
2 out of 866 
Years Active: 2008-2009
Title: **Inventor Spotlight: Ranko Hatsuda**
Introduction
Ranko Hatsuda, an accomplished inventor based in Chuo-ku, Japan, has made significant contributions to the field of photonic structures. With a total of three patents to his name, Hatsuda's innovations are at the forefront of modern optical technology, creating advancements that have wide-ranging applications in various industries.
Latest Patents
Hatsuda's latest patents showcase his expertise in the development of two-dimensional photonic crystals. His first invention aims to provide a two-dimensional photonic crystal that establishes a complete photonic band gap (PBG) effective for both TE-polarized and TM-polarized light. The design involves a slab-shaped body composed of a birefringent material, featuring holes arranged in a triangular lattice pattern. This innovation allows independent adjustment of the PBG for both polarization types by manipulating the anisotropy in the refractive index, thus ensuring a sufficient width of the complete PBG.
In his second patent, Hatsuda introduces a two-dimensional photonic crystal featuring an air-bridge structure, which offers high mechanical strength and operates as an efficient resonator. The design incorporates a slab layer with cyclically arranged regions of differing refractive indexes, producing a point-like defect that serves as a resonator for specific wavelengths of light. The air-bridge cavity, positioned above this defect, is supported by a clad layer that significantly enhances the crystal's structural integrity and light confinement capabilities.
Career Highlights
Hatsuda has built a distinguished career working with reputable organizations such as TDK Corporation and Kyoto University. His contributions in these institutions have not only advanced his own research but also enriched the collective knowledge within the field of photonics.
Collaborations
Throughout his career, Hatsuda has collaborated with notable figures in the field, including Susumu Noda and Takashi Asano. These partnerships have resulted in fruitful exchanges of ideas and have fostered groundbreaking research in photonic technologies.
Conclusion
Ranko Hatsuda's innovative work in the realm of two-dimensional photonic crystals positions him as a key figure in the field of optics. His inventions reflect a deep understanding of photonic structures, paving the way for future advancements and applications. As he continues to push the boundaries of technology through his patents, the impact of his work is expected to resonate profoundly across various scientific and commercial sectors.