Hiroko Nagasaka

Title: **Hiroko Nagasaka: Innovator in Semiconductor Technology**

Introduction

Hiroko Nagasaka is a prominent inventor based in Yokohama, Japan, known for her significant contributions to semiconductor technology. With a total of two patents, her work has greatly advanced the field of laser diodes and semiconductor etching processes.

Latest Patents

One of her latest patents is titled "Transverse-mode stabilized semiconductor laser diode with slab-coupled." This innovative device features a semiconductor laser diode with two semiconductive cladding layers of different conductivity types, carefully stacked upon a substrate. The design incorporates an active layer of an undoped semiconductor film sandwiched between the cladding layers, and a channel groove is formed in a current blocking layer to enhance performance. This invention aims to stabilize the transverse mode oscillation through a slab-coupled waveguide structure made from gallium arsenide containing aluminum.

The second patent, "Dry etching method of compound semiconductor," describes a novel approach for etching compound semiconductors. This process involves introducing a plasma-generating gas composed of boron trichloride and chlorine into a plasma generation region. By applying high-frequency electric power between a cathode supporting a workpiece and an opposing anode, a plasma is generated, allowing for precise etching of the compound semiconductor.

Career Highlights

Hiroko Nagasaka is employed at Kabushiki Kaisha Toshiba, where she utilizes her expertise in semiconductor technologies. Her work not only pushes the boundaries of current technology but also contributes to the innovation landscape within her company and the broader industry.

Collaborations

Throughout her career, Hiroko has collaborated with notable individuals such as Nawoto Motegi and Gen-ichi Hatakoshi. These collaborations reflect her commitment to advancing semiconductor research and the development of practical applications for her inventions.

Conclusion

Hiroko Nagasaka stands out as an influential figure in the field of semiconductor technology, with her patented innovations demonstrating her dedication to improving laser diode functionality and etching techniques. Her contributions continue to shape the future of this important industry, inspiring fellow inventors and researchers alike.