May 2023 Vol. 21 No. 552023

https://www.ntt-review.jp/archive/2023/202305.html

View from the Top
Hiroshi Tomiyasu, Senior Vice President, Head ofTechnology and Innovation General Headquarters, NTTDATA

Front-line Researchers
Masaya Notomi, Senior Distinguished Researcher, NTT
Basic Research Laboratories and Project Leader of NTT
Nanophotonics Center

Rising Researchers
Yasufumi Ogawa, Distinguished Researcher, NTT
Network Innovation CenterFeature Articles
Plasmon Control Technology
Overview and Prospects for Research on Plasmons in Two-dimensional Semiconductor Systems
Electrical Control of Plasmon Reflectivity in Graphene
Ultrafast Optical-to-electrical Conversion Processes in Graphene
Theoretical Proposal for Edge Magnetoplasmon Crystal
Time-resolved Measurement of Ambipolar Plasmon Transport in Semiconductor Composite
Quantum Wells

Regular Articles
Ultrafast and Low-power-consumption Membrane Lasers on Si with Integrated Optical Feedback

Global Standardization Activities
Report of the First ITU-T TSAG Meeting for the 2022–2024 Study Period

Special Report
50th Anniversary of NTT Yokosuka R&D Center

View from the Top

Hiroshi Tomiyasu, Senior Vice President, Head of Technologyand Innovation General Headquarters, NTT DATA

▼Abstract

NTT DATA creates new systems and value using information technology tocontribute to creating a more prosperous and harmonious society. In accordancewith the five strategies laid out in its medium-term management plan for FY 2022 to2025, the company aims to establish a virtuous cycle of investment and growth andachieve business growth toward the Global 3rd Stage. Hiroshi Tomiyasu, senior
vice president and head of Technology and Innovation General Headquarters, NTTDATA, is leading efforts toward this goal in terms of technology. We interviewed him
about specific technology strategies and his belief as a top executive.

Feature Articles
Plasmon Control Technology

Overview and Prospects for Research on Plasmons in
Two-dimensional Semiconductor Systems▼Abstract

Plasmons, which are collective oscillations of electric charges, have awide range of applications in sensors and other technologies.
Plasmons have also been attracting attention as potential new
information carriers due to their ability to be generated by light andpropagate within a region that exceeds the diffraction limit of light. This
article presents an overview of the research on plasmon control andbasic physical properties exploiting plasmons at NTT Basic ResearchLaboratories. Future prospects are also discussed.

Biosensor

Highly efficientphotoelectric conversion

Metamaterial

Plasmonics
Nanophotonics

Tip-enhanced
Raman spectroscopy

Regular Articles

Ultrafast and Low-power-consumption Membrane Lasers on
Si with Integrated Optical Feedback▼Abstract
We developed energy-efficient membrane III-V
distributed-reflector lasers on silicon-based
substrates for ultrafast short-reachcommunication links and neuromorphic
computing applications. By leveraging high-speed
photon-photon interactions enabled by integrated
optical feedback and a high-optical-confinementmembrane structure, we demonstrated
record-fast directly modulated laser bandwidths
and spike-processing rates with ultralow
operating energies. This is a step towards ourgoal of reducing the carbon footprint of
information and communication technology andartificial intelligence hardware, while keeping
pace with the increasing demand of processing
speeds.