Article
Materials Science, Multidisciplinary
Chia-Wei Tu, Martin Fraenzl, Qian Gao, Hark-Hoe Tan, Chennupati Jagadish, Heidrun Schmitzer, Hans Peter Wagner
Summary: This study demonstrates 2D photonic crystal lasing from an InP nanowire array still attached to the InP substrate, achieving lasing at room temperature and liquid nitrogen temperature. Investigations near threshold reveal the effects of excitation power on lasing initiation and emission mode transition.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Philipp Staudinger, Svenja Mauthe, Noelia Vico Trivino, Steffen Reidt, Kirsten E. Moselund, Heinz Schmid
Summary: By elaborately combining selective area growth of fins and zipper-induced epitaxial lateral overgrowth, the epitaxy of wurtzite InP microdisks and related geometries on insulator has been achieved, enabling co-integration of diversely shaped crystals at precise position. The grown material possesses high phase purity and excellent optical quality characterized by STEM and mu-PL. Optically pumped lasing at room temperature is achieved in microdisks with a lasing threshold of 365 mu J cm(-2). Our platform could provide novel geometries for photonic applications.
Letter
Optics
Satoshi Yanase, Kouichi Akahane, Atsushi Matsumoto, Toshimasa Umezawa, Naokatsu Yamamoto, Yoriko Tominaga, Atsushi Kanno, Tomohiro Maeda, Hideyuki Sotobayashi
Summary: This study investigates the effects of bismuth irradiation on InAs quantum dot lasers operating in the telecommunication wavelength band. The results show that bismuth irradiation has certain influences on the threshold current and temperature dependence of the lasers.
Article
Chemistry, Multidisciplinary
Yi Zhu, Vidur Raj, Ziyuan Li, Hark Hoe Tan, Chennupati Jagadish, Lan Fu
Summary: This study demonstrates InP nanowire array photodetectors capable of single-photon level light detection at room temperature without external bias. The device design enables broadband absorption, extremely low dark current, and efficient charge carrier separation, while achieving high bandwidth and low timing jitter.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Anna Musial, Maja Wasiluk, Michal Gawelczyk, Johann Peter Reithmaier, Mohamed Benyoucef, Grzegorz Sek, Wojciech Rudno-Rudzinski
Summary: This study demonstrates that optical excitation of InAs quantum dots (QDs) in an InP matrix can be facilitated by states in an InP/InGaAlAs distributed Bragg reflector (DBR) and defects in the InP matrix. Carrier relaxation and charge carrier occupation in the QDs are affected, as holes are favored to transfer due to the band structure. Carrier transfer between the InGaAlAs layer of the DBR and the InAs/InP QDs is directly observed, which can impact the coherence properties of single and entangled photons.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ali Jaffal, Philippe Regreny, Gilles Patriarche, Michel Gendry, Nicolas Chauvin
Summary: A growth procedure has been proposed to produce nanowires with asymmetric cross-sections, which can significantly affect the polarization of quantum dot emission and increase the degree of linear polarization; the current growth protocol is fully compatible with the applications of HA NWs, covering a wide range of devices.
Article
Optics
Mohamed Helmi Hadj Alouane, Olfa Nasr, Hammadi Khmissi, Bouraoui Ilahi, Gilles Patriarche, Mohamad M. Ahmad, Michel Gendry, Catherine Bru-Chevallier, Nicolas Chauvin
Summary: This study reported on the optical properties of InAs/InP quantum rod-nanowires grown on silicon substrates by molecular beam epitaxy, showing great potential as III-V nanoemitters for telecom-band applications. The nanostructure exhibited high stability of photoluminescence intensity at low temperatures and emitted at a wavelength of 1.55 μm at room temperature.
JOURNAL OF LUMINESCENCE
(2021)
Article
Nanoscience & Nanotechnology
Max Meunier, John J. H. Eng, Zhao Mu, Sebastien Chenot, Virginie Brandli, Philippe de Mierry, Weibo Gao, Jesus Zuniga-Perez
Summary: In 2018, a new single-photon source with high potential was discovered in gallium nitride, offering telecom wavelength emission, record-high brightness, good purity, and operation at room temperature. This article discusses the challenges associated with a low spatial density and a spectrally wide distribution of emitters in GaN layers, and describes the design and fabrication of bullseye antennas. The findings demonstrate that telecom single-photon emitters in GaN are well adapted for single-photon applications, but highlight the numerous difficulties that still need to be overcome for actual quantum photonic applications.
Article
Materials Science, Multidisciplinary
Dan Buca, Andjelika Bjelajac, Davide Spirito, Omar Concepcion, Maksym Gromovyi, Emilie Sakat, Xavier Lafosse, Laurence Ferlazzo, Nils von den Driesch, Zoran Ikonic, Detlev Grutzmacher, Giovanni Capellini, Moustafa El Kurdi
Summary: The success of GeSn alloys as active materials for infrared lasers has the potential to advance monolithic technology in mainstream silicon photonics. However, in order to operate on a chip, the lasers need to work at room temperature or higher. This study presents a strain engineering approach to induce large tensile strain in GeSn alloy micro-disks with a Sn content of 14 at%, enabling robust multimode laser emission at room temperature.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jia-Shiang Chen, Anushka Dasgupta, Darien J. Morrow, Ruggero Emmanuele, Tobin J. Marks, Mark C. Hersam, Xuedan Ma
Summary: Miniaturized near-infrared semiconductor lasers have widespread applications in various fields. By optimizing the cavity-emitter integration scheme, researchers have successfully demonstrated an excitonic laser based on semiconducting single-walled carbon nanotubes, offering stable and tunable operation at room temperature.
Article
Nanoscience & Nanotechnology
Paulo Jarschel, Jin Ho Kim, Louis Biadala, Maxime Berthe, Yannick Lambert, Richard M. Osgood, Gilles Patriarche, Bruno Grandidier, Jimmy Xu
Summary: This study explores the potential application of single-electron tunneling (SET) in PbS nanoplatelets for neuromorphic computing, providing new insights for the development of neuromorphic computing through modeling synaptic operations.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Samuele Cornia, Valeria Demontis, Valentina Zannier, Lucia Sorba, Alberto Ghirri, Francesco Rossella, Marco Affronte
Summary: Novel approaches exploiting the interaction between microwaves and quantum devices are being developed for efficient microwave detection. In this study, InAs/InP nanowire double quantum dot-based devices are used as nanoscale detectors to measure the local field without calibration. The detector performance is evaluated, and it is shown that these devices allow direct assessment of the microwave field with high sensitivity and spatial resolution, potentially advancing the development of high-performance microwave circuitries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Jonatan Fast, Yen-Po Liu, Yang Chen, Lars Samuelson, Adam M. Burke, Heiner Linke, Anders Mikkelsen
Summary: Researchers used a new optical-beam-induced current characterization method to study the performance of semiconductor nanowire devices. The experiment revealed the mechanism of hot-electron extraction and estimated the spatial region where significant extraction could occur.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Physics, Applied
Ryota Katsumi, Yasutomo Ota, Takeyoshi Tajiri, Satoshi Iwamoto, Kaur Ranbir, Johann Peter Reithmaier, Mohamed Benyoucef, Yasuhiko Arakawa
Summary: We present the hybrid integration of an InAs/InP quantum-dot (QD) single-photon source with a CMOS-processed Si photonics chip using transfer printing. This integration technique enables the assembly of photonic components through a pick-and-place operation, allowing for their introduction onto Si photonics chips after completing the entire CMOS-compatible fabrication processes. We demonstrate the generation of telecom single photons using an InAs/InP QD integrated on Si and their coupling into a waveguide. We also showcase the integration of a QD on a fiber-pigtailed Si chip and the single-photon output through the optical fiber, presenting a new pathway for modularizing solid-state quantum light sources.
APPLIED PHYSICS EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Lei Kong, Yang Mi, Weizheng Liang, Sheng-Nian Luo
Summary: A planar room-temperature NIR microlaser based on two-dimensional CdSe microplates was demonstrated in this study, showing excellent performance and stability. Hexagonal microplates outperformed triangular ones in terms of lasing performance and photostability, attributed to stronger light confinement. Additionally, the study on size-dependent lasing threshold revealed an inverse relationship between the threshold of hexagonal microplates and the square of cavity size.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Optics
Naotomo Takemura, Masato Takiguchi, Masaya Notomi
Summary: In this study, the impact of the spontaneous coupling coefficient beta on lasing properties in class-A limit is investigated, revealing that in this scenario all photon statistics are uniquely characterized by beta. The analogy of laser phase transition becomes transparent in the class-A limit.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Kenta Takata, Kengo Nozaki, Eiichi Kuramochi, Shinji Matsuo, Koji Takeda, Takuro Fujii, Shota Kita, Akihiko Shinya, Masaya Notomi
Summary: This study presents the first non-Hermitian nanophotonic platform, demonstrating spontaneous emission at exceptional points (EPs) through systematic tuning and independent current injection, revealing a clear EP phase transition and unique spectral features.
Article
Physics, Multidisciplinary
Ryuichi Ohta, Loic Herpin, Victor M. Bastidas, Takehiko Tawara, Hiroshi Yamaguchi, Hajime Okamoto
Summary: The study demonstrates a strain-mediated interaction between phonons and telecom photons using erbium ions in a mechanical resonator. Due to the long-lived nature of rare-earth ions, the dissipation rate of the optical resonance falls below that of the mechanical one, achieving a reversed dissipation regime in the optical frequency region. The interaction leads to stimulated excitation of erbium ions and the potential for single-photon strong coupling exceeding the dissipation rates of erbium and mechanical systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Masato Takiguchi, Kengo Nozaki, Hisashi Sumikura, Naotomo Takemura, Takuro Fujii, Eiichi Kuramochi, Akihiko Shinya, Shinji Matsuo, Masaya Notomi
Summary: Our research found strong excitonic absorption and large nonlinear wavelength shifts in buried multiple-quantum-well photonic crystal L3 nanocavities, where carriers are effectively confined. Negligible carrier diffusion and well-suppressed surface recombination allow confined carriers to survive for as long as the radiative lifetime. The strong optical confinement and small mode volume provided by photonic crystals enhance excitonic nonlinearity, leading to a significant excitonic effect that induces large refractive index changes and cavity-frequency shifts. Our findings will aid in the development of ultralow energy all-optical switching devices in the future.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Naotomo Takemura, Kenta Takata, Masato Takiguchi, Masaya Notomi
Summary: The research demonstrates that an array of coupled photonic crystal lasers can emulate the Kuramoto model with non-delayed nearest-neighbor coupling. Indirect coupling via additional cold cavities enables ideal mutual injection-locking and avoidance of strong laser coupling. By utilizing state-of-the-art buried multiple quantum well photonic crystals, the proposed structure can effectively realize the synchronization phenomena.
SCIENTIFIC REPORTS
(2021)
Article
Optics
S. Yasui, M. Hiraishi, A. Ishizawa, H. Omi, R. Kaji, S. Adachi, T. Tawara
Summary: Precise spectroscopy of the hyperfine level system of Er-167-doped Y2SiO5 was achieved in the frequency domain using an optical frequency comb to stabilize the light source frequency. The method allowed for obtaining a more accurate hole spectrum with a narrow homogeneous linewidth, opening the way for exploring relaxation mechanisms in the frequency domain through simple steady-state measurements.
Article
Optics
Xuejun Xu, Tomohiro Inaba, Tai Tsuchizawa, Atsushi Ishizawa, Haruki Sanada, Takehiko Tawara, Hiroo Omi, Katsuya Oguri, Hideki Gotoh
Summary: Integrated optical amplifiers are crucial for large-scale and complex silicon photonic integrated circuits. A low-loss waveguide platform has been developed based on rare-earth oxide thin films grown on silicon substrates. Optical signal enhancement has been observed in waveguides with high peak enhancement in a wide wavelength range, showcasing progress towards high-performance monolithic-integrated optical amplifiers on silicon.
Article
Optics
Feng Tian, Hisashi Sumikura, Eiichi Kuramochi, Masato Takiguchi, Masaaki Ono, Akihiko Shinya, Masaya Notomi
Summary: This study hybridizes a silicon-integrated optomechanical resonator with two-level atom-like emitters to demonstrate an optomechanical cavity quantum electrodynamic (cQED) effect, achieving dynamic modulation of the spontaneous emission rate. The coupled-nanobeam optomechanical resonator exhibits a strong Purcell effect and high cavity-modulation performances. The experimental results are well explained by an analytical model combining optomechanical and cQED theories.
Article
Physics, Multidisciplinary
Naotomo Takemura, Masato Takiguchi, Masaya Notomi
Summary: In this paper, the validity of the Ginzburg-Landau theory for lasers is examined theoretically by considering various parameters, particularly the ratio between photon and carrier lifetimes. It is demonstrated that, for low-beta lasers, the GL theory remains applicable even when the photon lifetime is comparable to the carrier lifetime.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Nanoscience & Nanotechnology
Masato Takiguchi, Guoqiang Zhang, Satoshi Sasaki, Kouta Tateno, Caleb John, Masaaki Ono, Hisashi Sumikura, Akihiko Shinya, Masaya Notomi
Summary: By using FIB technology, we found that the Al2O3 coating can effectively protect nanowires from damage during the FIB process and maintain their optical properties. This study proves the importance of FIB for future nanofabrication.
Article
Nanoscience & Nanotechnology
Yuto Moritake, Masaya Notomi
Summary: In this paper, the authors propose and numerically demonstrate the formation of a Huygens dipole using an exceptional point (EP) eigenstate in non-Hermitian (NH) coupled plasmonic systems. The unidirectional radiation from the artificial Huygens dipole can be switched by changing the sign of a coupling constant. The formation of the Huygens dipole and its switchable unidirectional radiation can be observed as long as the EP condition is fulfilled. The control of artificial electric and magnetic dipoles based on NH systems provides new possibilities for constructing Huygens metasurfaces and Huygens dipole antennas.
Article
Optics
S. Yasui, M. Hiraishi, A. Ishizawa, H. Omi, T. Inaba, X. Xu, R. Kaji, S. Adachi, T. Tawara
Summary: By using the 167Er3+:Y2SiO5 hyperfine level system, researchers created high-resolution atomic frequency combs (AFCs) and optimized the pulse sequence for efficient AFC quantum memory. The results show that AFCs with a resolution of 800 kHz can be created using appropriate pump light intensity, achieving an efficiency of 0.16% and a memory time of 0.5 μs even under zero magnetic field and 10 ppm Er concentration.
