Article
Optics
Junichi Hamazaki, Yoh Ogawa, Tadashi Kishimoto, Shin'ichro Hayashi, Norihiko Sekine, Iwao Hosako
Summary: In this study, we demonstrate wavelength conversion for terahertz (THz) wave generation using different types of waveguide structures under similar experimental conditions. Compared to bulk periodically poled lithium niobate (bulk-PPLN), the ridge-type/bulk periodically poled lithium niobate (RT-/bulk-PPLN) shows significantly higher conversion efficiency and improved performance.
Article
Optics
Suparna Seshadri, Navin Lingaraju, Hsuan -Hao Lu, Poolad Imany, Daniel E. Leaird, Andrew M. Weiner
Summary: This study demonstrates a distributed sensing approach that utilizes phase modulation to improve timing resolution by mapping changes in spectral phase. By extracting information from the joint biphoton phase, generalized delay can be measured, and absolute measurement of time delay can be achieved by combining ToF data.
Article
Engineering, Electrical & Electronic
Adam Widomski, Stanislaw Stopinski, Krzysztof Anders, Ryszard Piramidowicz, Michal Karpinski
Summary: In this paper, we present a indium phosphide-based photonic integrated circuit that allows accurate control of the temporal and spectral profiles of optical pulses generated at the telecom wavelengths. The device enables simultaneous temporally and spectrally resolved measurements using single photon counting and has applications in multidimensional time-frequency quantum key distribution.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Wenle Weng, Aleksandra Kaszubowska-Anandarajah, Prince M. Anandarajah, Andre N. Luiten
Summary: We combine a gain-switched laser comb with a continuous-wave translation laser within a periodically poled lithium niobate microresonator and demonstrate efficient and broadband sum-frequency conversion, spectrally translating the near-infrared comb to the visible domain.
Article
Engineering, Electrical & Electronic
Joselito E. Muldera, Jessica Pauline C. Afalla, Takashi Furuya, Hideaki Kitahara, Elmer S. Estacio, Katsuhiko Saito, Qixin Guo, Masahiko Tani
Summary: It is demonstrated that intense terahertz emission can be generated from titanium-diffused magnesium oxide-doped lithium niobate waveguides, with improved signal quality at higher frequencies. These waveguides perform comparably to commercial terahertz emitters, offering broader bandwidth and higher signal-to-noise ratios, indicating potential advantages at higher frequencies.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Optics
Yingwen Zhang, Duncan England, Andrei Nomerotski, Benjamin Sussman
Summary: In this work, spectral-temporal correlation measurements of the Hong-Ou-Mandel interference effect were demonstrated using a spectrometer based on a photon-counting camera. The setup offers high resolution and flexibility, allowing for efficient gathering of spectral and temporal information from a HOM interferometer.
Article
Optics
Norihiko Nishizawa, Masahito Yamanaka
Summary: The study investigated multiple spectral peak generation in normal-dispersion highly nonlinear fibers, achieving wideband multiple spectral peak generation using an ultrashort-pulse fiber laser, a CH4 gas cell, and highly nonlinear fiber. Induced phase shifts in the absorption spectra were clearly observed during spectral peak generation, and the generated spectral peaks exhibited low noise properties.
Article
Physics, Multidisciplinary
L. A. Lopez, J. C. Olvera
Summary: This study analyzed the frequency shifts of photons emitted from massive particles moving in stable geodesics around black holes with nonlinear electrodynamics. The motion of the photons is influenced by an effective metric and modified by magnetic and electric factors, distinguishing nonlinear electrodynamics from linear dynamics. The frequency shifts for various types of black holes were compared with their linear electromagnetic counterparts to illustrate the differences.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Physics, Applied
Rui-Bo Jin, Hiroki Oshima, Takumi Yagisawa, Masahiro Yabuno, Shigehito Miki, Fumihiro China, Hirotaka Terai, Ryosuke Shimizu
Summary: Precise manipulation of the time-frequency modes of entangled photons is crucial for future quantum science and technologies. The frequency-domain-quantum-optical-synthesis (FD-QOS) method provides an efficient and flexible way to modulate the temporal distributions of entangled photons. However, spectral modulations are also needed in many applications. In this study, a proof-of-concept experiment of two-photon spectral modulation via temporal manipulation is presented, enabling complete control over biphoton states.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Analytical
Yuning Zhang, Jiayang Wu, Yunyi Yang, Yang Qu, Linnan Jia, Baohua Jia, David J. Moss
Summary: We experimentally demonstrate enhanced spectral broadening of femtosecond optical pulses after propagation through silicon-on-insulator (SOI) nanowire waveguides integrated with two-dimensional (2D) graphene oxide (GO) films. The strong mode overlap between the SOI nanowires and the GO films with a high Kerr nonlinearity significantly enhances the self-phase modulation (SPM) process, resulting in improved spectral broadening of the femtosecond pulses. By using a solution-based, transfer-free coating method, GO films are integrated onto the SOI nanowires with precise control of the film thickness. Detailed SPM measurements are carried out, achieving a broadening factor of up to 4.3 for a device with 0.4-mm-long, 2 layers of GO. The experimental results show an improvement in the waveguide nonlinear parameter and the effective nonlinear figure of merit (FOM) compared to the uncoated waveguide. The influence of GO film length on spectral broadening is discussed, and the nonlinear optical performance of different integrated waveguides coated with GO films is compared.
Article
Engineering, Electrical & Electronic
Bowen Li, Sheng Wang, Yuan Wei, Shu-Wei Huang, Kenneth K. Y. Wong
Summary: Temporal imaging is a promising technique for ultrafast signal characterization, but conventional systems have constraints. Recent efforts have led to advanced temporal imaging systems with enhanced performance, enabling applications in various fields.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Wenjie Yue, Tao Chen, Wei Kong, Chengbo Mou, Genghua Huang, Zhiping He, Rong Shu
Summary: This study demonstrates a spectral and repetition rate programmable Yb-doped fiber laser using an acousto-optic tunable filter (AOTF) as both the intra-cavity spectral filter and temporal modulator. Different pulsed operation modes, including tunable single-wavelength, simultaneous dual-wavelength, and alternative dual-wavelength lasing, were achieved by driving the AOTF with specially programmed sequences of wave packets. The combination of both spectral and temporal control without moving elements provides a promising approach for the development of a simple yet versatile fiber laser.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Telecommunications
Muyiwa Balogun, Stanislav Derevyanko
Summary: NFT is a new field of optical communications that can resist nonlinearity and dispersion, using orthogonal Hermite-Gaussian spectral forms as waveform carriers to improve system performance. The proposed multiplexing scheme outperforms current NFT systems in terms of spectral efficiency and bit error rate when neglecting the effects of inline noise.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Chemistry, Analytical
Aris Ikiades, Ioannis D. Bassukas, Nikolaos Kourkoumelis
Summary: This article discusses the use of a fiber optic array sensor to monitor the freezing depth during cryotherapy. The sensor measures the backscattered and transmitted light from frozen and unfrozen tissues and uses the variations in optical diffusion properties to determine the extent of freezing. Both ex vivo and in vivo measurements yielded comparable results, despite spectral variations caused by the hemoglobin absorption peak. The sensor has the potential to be utilized for real-time monitoring of cryosurgery.
Article
Optics
Aitor De Andres, Spencer W. Jolly, Peter Fischer, Alexander A. Muschet, Fritz Schnur, Laszlo Veisz
Summary: This work investigates the spatio-spectral coupling phenomenon in optical parametric amplification caused by a non-collimated pump beam, which leads to a change in the amplified signal direction compared to the input seed. The effect is characterized experimentally, explained with a theoretical model, and reproduced through numerical simulations. It is especially relevant for high-gain non-collinear OPA configurations and sequential optical parametric synthesizers. In collinear configuration, it also produces angular and spatial chirp. Experimental results show a 40% decrease in peak intensity and more than 25% local elongation of pulse duration at the focus. Strategies to correct or mitigate the coupling are presented and demonstrated in two different systems. This work is important for the development of OPA-based systems and few-cycle sequential synthesizers.
Article
Optics
H. F. Fotso, J. Vicente, J. K. Freericks
Article
Materials Science, Multidisciplinary
S. -X. Yang, H. Fotso, H. Hafermann, K. -M. Tam, J. Moreno, T. Pruschke, M. Jarrell
Article
Physics, Fluids & Plasmas
S. X. Yang, H. Fotso, J. Liu, T. A. Maier, K. Tomko, E. F. D'Azevedo, R. T. Scalettar, T. Pruschke, M. Jarrell
Article
Physics, Fluids & Plasmas
Ka-Ming Tam, H. Fotso, S. -X. Yang, Tae-Woo Lee, J. Moreno, J. Ramanujam, M. Jarrell
Article
Physics, Multidisciplinary
S. -X. Yang, H. Fotso, S. -Q. Su, D. Galanakis, E. Khatami, J. -H. She, J. Moreno, J. Zaanen, M. Jarrell
PHYSICAL REVIEW LETTERS
(2011)
Article
Multidisciplinary Sciences
H. Fotso, K. Mikelsons, J. K. Freericks
SCIENTIFIC REPORTS
(2014)
Article
Optics
H. F. Fotso
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2019)
Review
Physics, Multidisciplinary
Herbert F. Fotso, James K. Freericks
FRONTIERS IN PHYSICS
(2020)
Review
Quantum Science & Technology
Herbert F. Fotso, Ka-Ming Tam, Juana Moreno
Summary: This article discusses the challenges of strongly correlated systems, the importance of computational methods in addressing these challenges, and the development and application of multiscale many-body methods.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Eric Dohner, Hanna Terletska, Ka-Ming Tam, Juana Moreno, Herbert F. Fotso
Summary: We present a solution for the nonequilibrium dynamics of an interacting disordered system by adapting the equilibrium dynamical mean-field theory and the equilibrium coherent potential approximation methods. Our approach uses the Kadanoff-Baym-Keldysh complex time contour to study the dynamics of interacting disordered systems away from equilibrium. We obtain the equilibrium density of states of the disordered interacting system and observe the effect of disorder on the relaxation of the system.
Article
Materials Science, Multidisciplinary
Herbert F. Fotso
Article
Materials Science, Multidisciplinary
H. F. Fotso, V. V. Dobrovitski