87 citations · 328 across the 19 of their papers we have counts for
19 papers
Ultralow-power, high-speed programmable Si photonic circuits with InGaAsP membrane
Tomohiro Akazawa, Rui Tang, Hanzhi Tang +6
Programmable photonic circuits have emerged as a promising platform for applications ranging from optical communications to artificial-intelligence computing and quantum informatio…
Substrate-Voltage-Controlled Temporal Nonlinearity in Ferroelectric FET-based Reservoir Computing
Eishin Nako, Ryosho Nakane, Mitsuru Takenaka +2
Physical reservoir computing exploits inherent nonlinearity and short-term memory of physical dynamics to achieve efficient processing of time-series data with extremely-low traini…
Low-loss SbS Optical Phase Shifter Enabled by Optimizing Sputtering Conditions
Yuto Miyatake, Tomohiro Anda, Yosuke Wakita +6
By quantitatively evaluating the atomic concentrations of sputtered SbS films with different sputtering powers and Ar flows, we reveal that a sputtered SbS film bec…
17 GHz Lossless InP-Membrane Active Metasurface
Taichiro Fukui, Kei Sumita, Hiroki Miyano +12
High-speed active metasurfaces enable spatiotemporal control of incident light within an ultra-thin layer, offering new possibilities for optical communication, computing, and sens…
Scalable intensity-based photonic matrix-vector multiplication processor using single-wavelength time-division-multiplexed signals
Chengli Chai, Rui Tang, Makoto Okano +3
Photonic integrated circuits provide a compact platform for ultrafast and energy-efficient matrix-vector multiplications (MVMs) in the optical domain. Recently, schemes based on ti…
Waveguide-multiplexed photonic matrix-vector multiplication processor using multiport photodetectors
Rui Tang, Makoto Okano, Chao Zhang +3
The slowing down of Moore's law has driven the development of application-specific processors for deep learning. Analog photonic processors offer a promising solution for accelerat…
Si-waveguide-based optical power monitoring of 22 Mach$\unicode{x2013}$Zehnder interferometer based on InGaAsP/Si hybrid MOS optical phase shifter
Tomohiro Akazawa, Stéphane Monfray, Frédéric Boeuf +3
Transparent in-line optical power monitoring in Si programmable photonic integrated circuits (PICs) is indispensable for calibrating integrated optical devices such as optical swit…
Symmetric silicon microring resonator optical crossbar array for accelerated inference and training in deep learning
Rui Tang, Shuhei Ohno, Ken Tanizawa +5
Photonic integrated circuits are emerging as a promising platform for accelerating matrix multiplications in deep learning, leveraging the inherent parallel nature of light. Althou…
Non-volatile optical phase shift in ferroelectric hafnium zirconium oxide
Kazuma Taki, Naoki Sekine, Kouhei Watanabe +6
A non-volatile optical phase shifter is a critical component for enabling large-scale, energy-efficient programmable photonic integrated circuits (PICs) on a silicon (Si) photonics…
Breakdown-limited endurance in HZO FeFETs: mechanism and improvement under bipolar stress
Kasidit Toprasertpong, Mitsuru Takenaka, Shinichi Takagi
Breakdown is one of main failure mechanisms that limit write endurance of ferroelectric devices using hafnium oxide-based ferroelectric materials. In this study, we investigate the…
Memory Window in Ferroelectric Field-Effect Transistors: Analytical Approach
Kasidit Toprasertpong, Mitsuru Takenaka, Shinichi Takagi
A memory window of ferroelectric field-effect transistors (FeFETs), defined as a separation of the HIGH-state and the LOW-state threshold voltages, is an important measure of the F…
Non-volatile hybrid optical phase shifter driven by a ferroelectric transistor
Rui Tang, Kouhei Watanabe, Masahiro Fujita +5
Optical phase shifters are essential elements in photonic integrated circuits (PICs) and function as a direct interface to program the PIC. Non-volatile phase shifters, which can r…
Ultrahigh-sensitivity optical power monitor for Si photonic circuits
Takaya Ochiai, Kei Sumita, Shuhei Ohno +5
A phototransistor is a promising candidate as an optical power monitor in Si photonic circuits since the internal gain of photocurrent enables high sensitivity. However, state-of-t…
Si microring resonator crossbar array for on-chip inference and training of optical neural network
Shuhei Ohno, Kasidit Toprasertpong, Shinichi Takagi +1
Deep learning is one of the most advancing technologies in various fields. Facing the limits of the current electronics platform, optical neural networks (ONNs) based on Si program…
Evaluation of polarization characteristics in metal/ferroelectric/semiconductor capacitors and ferroelectric field-effect transistors
Kasidit Toprasertpong, Kento Tahara, Mitsuru Takenaka +1
In this study, we propose a measurement technique for evaluating ferroelectric polarization characteristics in ferroelectric field-effect transistors (FeFETs). Different from stand…
Microscopic observation of carrier-transport dynamics in quantum-structure solar cells using a time-of-flight technique
Kasidit Toprasertpong, Naofumi Kasamatsu, Hiromasa Fujii +7
In this study, we propose a carrier time-of-flight technique to evaluate the carrier transport time across a quantum structure in an active region of solar cells. By observing the…
Generalized Reciprocity Relations in Solar Cells with Voltage-Dependent Carrier Collection: Application to p-i-n Junction Devices
Kasidit Toprasertpong, Amaury Delamarre, Yoshiaki Nakano +2
Two reciprocity theorems are important for fundamental understanding of the solar cell operation and applications to device evaluation: (1) the carrier-transport reciprocity connec…
Effective mobility for sequential carrier transport in multiple quantum well structures
Kasidit Toprasertpong, Stephen M. Goodnick, Yoshiaki Nakano +1
We investigate a theoretical model for effective carrier mobility to comprehensively describe the behavior of the perpendicular carrier transport across multiple quantum well (MQW)…
Investigation and modeling of photocurrent collection process in multiple quantum well solar cells
Kasidit Toprasertpong, Tomoyuki Inoue, Yoshiaki Nakano +1
Solar cells employing quantum wells can enhance the light absorption but suffer from the difficulty in photogenerated carrier extraction. Here, we analyzed the spectral response an…