Takuya Inoue
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View article: Frequency-modulated high-power photonic-crystal surface-emitting lasers for long-distance coherent free-space optical communications
Frequency-modulated high-power photonic-crystal surface-emitting lasers for long-distance coherent free-space optical communications Open
High-power coherent optical transmitters with high-speed controllability are in demand for a number of cutting-edge applications, including intersatellite communications and deep-space optical communications. The conventional transmitters …
View article: Narrow-linewidth 1.55-µm-wavelength InP-based photonic-crystal surface-emitting lasers with near-diffraction-limited beam quality
Narrow-linewidth 1.55-µm-wavelength InP-based photonic-crystal surface-emitting lasers with near-diffraction-limited beam quality Open
We demonstrate 1.55-µm-wavelength InP-based photonic-crystal surface-emitting lasers (PCSELs) featuring narrow spectral linewidth, high output power, and excellent beam quality. PCSELs simultaneously support narrow-linewidth operation and …
View article: Origins and conservation of topological polarization defects in resonant photonic-crystal diffraction
Origins and conservation of topological polarization defects in resonant photonic-crystal diffraction Open
We present a continuative definition of topological charge to depict the polarization defects on any resonant diffraction orders in photonic crystal slab regardless they are radiative or evanescent. By using such a generalized definition, …
View article: Design and experimental demonstration of photonic-crystal lasers with multijunction active layers
Design and experimental demonstration of photonic-crystal lasers with multijunction active layers Open
We introduce multijunction active layers, featuring a stack of alternating active layers and tunnel junctions, to photonic-crystal surface-emitting lasers (PCSELs) to increase their slope efficiency, which is vital for various applications…
View article: High-peak-power short-pulse operation of modulated PCSELs emitting structured light by introducing saturable absorber
High-peak-power short-pulse operation of modulated PCSELs emitting structured light by introducing saturable absorber Open
Compact, high-peak-power light sources emitting structured light such as multi-dot patterns are desired for face recognition and light detection and ranging (LiDAR) applications, especially in the field of mobile technology. Conventionally…
View article: Design and experimental demonstration of photonic-crystal lasers with multijunction active layers
Design and experimental demonstration of photonic-crystal lasers with multijunction active layers Open
We introduce multijunction active layers, featuring a stack of alternating active layers and tunnel junctions, to PCSELs to increase their slope efficiency, which is vital for various applications including laser processing and LiDAR. Firs…
View article: Two-wavelength non-dispersive infrared sensing systems using stacked electrically controllable photonic-crystal band-pass filters
Two-wavelength non-dispersive infrared sensing systems using stacked electrically controllable photonic-crystal band-pass filters Open
We present a scheme of non-dispersive infrared (NDIR) sensing utilizing stacked, two-wavelength electrically controllable bandpass filters that integrate multiple quantum wells (MQWs) and photonic crystals. By appropriately designing the M…
View article: High-speed high-power free-space optical communication via directly modulated watt-class photonic-crystal surface-emitting lasers
High-speed high-power free-space optical communication via directly modulated watt-class photonic-crystal surface-emitting lasers Open
Photonic crystal surface-emitting lasers (PCSELs), which use a two-dimensional photonic crystal as the laser cavity, can achieve both high output powers and narrow beam divergence angles owing to single-mode lasing over a large area. High-…
View article: High-power, stable single-mode CW operation of 1550 nm wavelength InP-based photonic-crystal surface-emitting lasers
High-power, stable single-mode CW operation of 1550 nm wavelength InP-based photonic-crystal surface-emitting lasers Open
1550 nm wavelength photonic-crystal surface-emitting lasers (PCSELs) are attractive for optical communication and eye-safe sensing applications. In this study, we present InP-based PCSELs featuring a double-lattice photonic-crystal structu…
View article: Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths: erratum
Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths: erratum Open
An erratum is given to correct two typographical errors in Optica 11 , 333 ( 2024 ) OPTIC8 2334-2536 10.1364/OPTICA.505406 . The corrections do not impact the results and conclusions of the original paper.
View article: High-power and high-efficiency operation of 1.3 µm-wavelength InP-based photonic-crystal surface-emitting lasers with metal reflector
High-power and high-efficiency operation of 1.3 µm-wavelength InP-based photonic-crystal surface-emitting lasers with metal reflector Open
We demonstrate high-output-power and high-efficiency operation of 1.3-µm-wavelength InP-based photonic-crystal surface-emitting lasers (PCSELs). By introducing a metal reflector and adjusting the phase of the reflected light via optimizati…
View article: Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths
Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths Open
Photonic-crystal surface-emitting lasers (PCSELs) are capable of single-mode, high-power lasing over a large resonator area owing to two-dimensional resonance at a singularity point of the photonic band structure. Since the number of photo…
View article: Crawlerization of autonomous mobile robots to improve their ability to travel over rough roads
Crawlerization of autonomous mobile robots to improve their ability to travel over rough roads Open
View article: Green-wavelength GaN-based photonic-crystal surface-emitting lasers
Green-wavelength GaN-based photonic-crystal surface-emitting lasers Open
Visible-wavelength GaN-based photonic-crystal surface-emitting lasers (PCSELs) have attracted attention for various applications, such as materials processing, high-brightness illuminations, and displays. In this letter, we demonstrate GaN…
View article: Origins and conservation of topological polarization defects in resonant photonic-crystal diffraction
Origins and conservation of topological polarization defects in resonant photonic-crystal diffraction Open
We present a continuative definition of topological charge to depict the polarization defects on any resonant diffraction orders in photonic crystal slab regardless they are radiative or evanescent. By using such a generalized definition, …
View article: Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths
Demonstration of high-power photonic-crystal surface-emitting lasers with 1-kHz-class intrinsic linewidths Open
Photonic-crystal surface-emitting lasers (PCSELs) are capable of single-mode, high-power lasing over a large resonator area owing to two-dimensional resonance at a singularity point of the photonic band structure. Since the number of photo…
View article: 200-W short-pulse operation of photonic-crystal lasers based on simultaneous absorptive and radiative Q-switching
200-W short-pulse operation of photonic-crystal lasers based on simultaneous absorptive and radiative Q-switching Open
Short-pulse high-peak-power lasers are crucial laser sources for various applications such as non-thermal ultrafine material processing and eye-safe high-resolution remote sensing. Realizing such operation in a single semiconductor laser c…
View article: High-brightness scalable continuous-wave single-mode photonic-crystal laser
High-brightness scalable continuous-wave single-mode photonic-crystal laser Open
View article: Smart laser controlling mixed-mode state
Smart laser controlling mixed-mode state Open
It is desirable to control the mode states of a laser to stabilize it under the influence of environmental factors as well as to tailor the laser beam. Here, we demonstrate mixed-mode-state control in a photonic crystal surface-emitting la…
View article: Proposal and Demonstration of Free-Space Optical Communication Using Photonic Crystal Surface-Emitting Lasers
Proposal and Demonstration of Free-Space Optical Communication Using Photonic Crystal Surface-Emitting Lasers Open
We propose and demonstrate free-space optical (FSO) communication using photonic crystal surface-emitting lasers (PCSELs). Unlike other types of conventional semiconductor lasers, such as edge-emitting lasers (EELs) and vertical-cavity sur…
View article: Self-evolving photonic crystals for ultrafast photonics
Self-evolving photonic crystals for ultrafast photonics Open
Ultrafast dynamics in nanophotonic materials is attracting increasing attention from the perspective of exploring new physics in fundamental science and expanding functionalities in various photonic devices. In general, such dynamics is in…
View article: Non-mechanical three-dimensional LiDAR system based on flash and beam-scanning dually modulated photonic crystal lasers
Non-mechanical three-dimensional LiDAR system based on flash and beam-scanning dually modulated photonic crystal lasers Open
We propose and develop a new type of non-mechanical three-dimensional (3D) light detection and ranging (LiDAR) system, which integrates a beam-scanning-type laser source and a flash-type laser source. Employing on-chip dually modulated pho…
View article: Towards optimization of photonic-crystal surface-emitting lasers via quantum annealing
Towards optimization of photonic-crystal surface-emitting lasers via quantum annealing Open
Photonic-crystal surface-emitting lasers (PCSELs), which utilize a two-dimensional (2D) optical resonance inside a photonic crystal for lasing, feature various outstanding functionalities such as single-mode high-power operation and arbitr…
View article: Wide-bandgap GaN-based watt-class photonic-crystal lasers
Wide-bandgap GaN-based watt-class photonic-crystal lasers Open
Short-wavelength (blue-violet-to-green) lasers with high power and high beam quality are required for various applications including the machining of difficult-to-process materials and high-brightness illuminations and displays. Promising …
View article: High-power CW oscillation of 1.3-µm wavelength InP-based photonic-crystal surface-emitting lasers
High-power CW oscillation of 1.3-µm wavelength InP-based photonic-crystal surface-emitting lasers Open
We demonstrate high-power continuous-wave (CW) lasing oscillation of 1.3-µm wavelength InP-based photonic-crystal surface-emitting lasers (PCSELs). Single-mode operation with an output power of over 100 mW, a side-mode suppression ratio (S…
View article: General recipe to realize photonic-crystal surface-emitting lasers with 100-W-to-1-kW single-mode operation
General recipe to realize photonic-crystal surface-emitting lasers with 100-W-to-1-kW single-mode operation Open
Realization of one-chip, ultra-large-area, coherent semiconductor lasers has been one of the ultimate goals of laser physics and photonics for decades. Surface-emitting lasers with two-dimensional photonic crystal resonators, referred to a…
View article: Dually modulated photonic crystal lasers for wide-range flash illumination
Dually modulated photonic crystal lasers for wide-range flash illumination Open
Flash light sources with a wide field of view (FOV) are indispensable in various fields such as light detection and ranging (LiDAR), optical wireless communication, and adaptive lighting. However, conventional flash light sources, which co…
View article: Self-consistent analysis of photonic-crystal surface-emitting lasers under continuous-wave operation
Self-consistent analysis of photonic-crystal surface-emitting lasers under continuous-wave operation Open
We develop a self-consistent theoretical model for simulating the lasing characteristics of photonic-crystal surface-emitting lasers (PCSELs) under continuous-wave (CW) operation that takes into account thermal effects caused by current in…
View article: Integrated near-field thermophotovoltaic device overcoming far-field blackbody limit
Integrated near-field thermophotovoltaic device overcoming far-field blackbody limit Open
Near-field thermal radiation transfer overcoming the far-field blackbody limit has attracted significant attention in recent years owing to its potential for drastically increasing the output power and conversion efficiency of thermophotov…
View article: Publisher Correction: Photonic-crystal lasers with two-dimensionally arranged gain and loss sections for high-peak-power short-pulse operation
Publisher Correction: Photonic-crystal lasers with two-dimensionally arranged gain and loss sections for high-peak-power short-pulse operation Open