Nobuyuki Ikoma

Title: Nobuyuki Ikoma: Innovator in Semiconductor Technology

Introduction

Nobuyuki Ikoma is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 7 patents. His work focuses on the development and fabrication of advanced semiconductor optical devices and lasers.

Latest Patents

Ikoma's latest patents include a semiconductor optical device and a method of fabricating the same. This method involves forming a semiconductor region by growing an InP lower film, an active region, an InP upper film, and a capping film on a substrate sequentially. The capping film's material differs from that of InP. A mask is then formed on the capping film, and the semiconductor region is etched to create a semiconductor stripe mesa. This mesa includes an InP lower cladding layer, an active layer, an InP upper cladding layer, and a capping layer. The active layer comprises aluminum-based III-V compounds. The design of the capping layer features a top surface width greater than that of the bottom surface. Additionally, the minimum width of the semiconductor mesa is located in the InP upper cladding layer. Following the formation of the semiconductor stripe mesa, a thermal process is conducted to create a mass transport semiconductor on the side of the InP upper cladding layer, utilizing an atmosphere containing V-group material.

Another notable patent is for a semiconductor laser and the method for manufacturing the same. This invention provides a semiconductor laser with a feedback grating made of InP and AlGaInAs, without InAsP in between. The laser diode (LD) consists of an n-type InP substrate, an AlInAsP intermediate layer, an AlGaInAs lower SCH layer, an active layer, and a p-type layer for upper cladding, arranged in that order from the InP substrate. The feedback grating is formed by the InP substrate, the AlInAsP intermediate layer, and the AlGaInAs lower SCH layer, which collectively lower the series resistance along these semiconductor stacks.

Career Highlights

Nobuyuki Ikoma is currently employed at Sumitomo Electric Industries, Limited, where he continues to innovate in semiconductor technology. His work has been instrumental in advancing the capabilities of semiconductor devices, particularly in optical applications.

Collaborations