Article
Materials Science, Multidisciplinary
Sepehr Benis, Natalia Munera, Sanaz Faryadras, Eric W. Van Stryland, David J. Hagan
Summary: The researchers directly measured the nonlinear optical (NLO) phase shift of an Indium-Tin-Oxide (ITO) thin film using three different techniques. They found that centering the probe pulse at the ENZ position greatly enhances this phenomenon, while the excitation wavelength has a smaller effect. Additionally, they observed large-scale ultrafast cross-phase modulation and measured degenerate nonlinear refraction in ITO using the Z-scan method.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Francis Walz, Siddhant Pandey, Liang Z. Tan, Niranjan Shivaram
Summary: We report an experiment to measure the femtosecond electric field of the signal emitted from an optical third-order nonlinear interaction in carbon dioxide molecules. The study found that the chirp of the emitted nonlinear signal is sensitive to the electronic and rotational contributions to the nonlinear response.
Article
Spectroscopy
Maria Merin Antony, C. S. Suchand Sandeep, Vadakke Matham Murukeshan
Summary: Broadband hyperspectral z-scan using a supercontinuum light source is a convenient technique to obtain spectrally resolved nonlinear optical properties of materials. A 3D data model is proposed for representing the data obtained from broadband z-scan measurements, aiding in the quick characterization of spectrally resolved nonlinear optical properties of materials.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Multidisciplinary Sciences
Dandan Hui, Husain Alqattan, Simin Zhang, Vladimir Pervak, Enam Chowdhury, Mohammed Th. Hassan
Summary: Modern electronics switch electrical signals using radio frequency electromagnetic fields on the nanosecond time scale, limiting the speed to gigahertz. Optical switches using terahertz and ultrafast laser pulses have recently been developed, increasing the switching speed to picoseconds and femtoseconds. This study demonstrates optical switching with attosecond resolution using the reflectivity modulation of a fused silica dielectric system, and shows the capability of controlling the switching signal using synthesized laser pulses for binary encoding. The results pave the way for optical switches and light-based electronics with petahertz speeds, significantly faster than current semiconductor-based electronics, and have important implications for information technology, optical communications, and photonic processor technologies.
Article
Energy & Fuels
Zhitian Niu, Hong Qi, Zeyu Zhu, Yatao Ren, Mingjian He, Baohai Gao
Summary: This paper presents a nonlinear multispectral tomographic absorption deflection spectroscopy (MTADS) technique based on Bayesian inference, aiming to predict temperature and gas concentration in aerospace propulsion systems with high temperature, pressure, and distortion. The technique combines a forward model, which considers inhomogeneous refractive index gradient and laser deflection, with an inverse model to improve measurement accuracy and robustness. Simulation and experimental results demonstrate the effectiveness of MTADS in quantitatively measuring flame topology and parameter distribution.
Article
Optics
Kun Liu, Zhongguo Li, Xingzhi Wu, Yu Fang, Wenfa Zhou, Junyi Yang, Yingfei Sun, Ruipeng Niu, Zhangyang Shao, Lu Chen, Run Zhao, Yinglin Song
Summary: Al:CdO thin films with different aluminum doping concentrations were prepared via magnetron sputtering technique. The band gap and nonlinear absorption properties of the films can be effectively modulated by the Al concentration. The films also exhibit desirable carrier dynamics and optical limiting properties at high doping concentration.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Michalis Stavrou, Amelie M. Muehlbach, Vasilios Arapakis, Elisabeth Gross, Tim Kratky, Sebastian Guenther, Bernhard Rieger, Stelios Couris
Summary: This study reports on the ultrafast saturable absorption (SA), optical limiting (OL), and nonlinear refractive response of hydride-terminated silicon nanosheets (SiNS-H) that are differently functionalized with styrene and tert-butyl methacrylate (tBuMA). The results show that the functionalized SiNSs exhibit greatly enhanced nonlinear optical (NLO) responses, with strong SA behavior under 400 nm laser excitation and highly efficient OL performance under 800 nm laser excitation. Additionally, the SiNS samples demonstrate strong NLO refraction comparable to that of bulk silicon, making them potential candidates in optoelectronic and photonic applications.
Article
Chemistry, Multidisciplinary
Michalis Stavrou, Amelie M. Muehlbach, Vasilios Arapakis, Elisabeth Gross, Tim Kratky, Sebastian Guenther, Bernhard Rieger, Stelios Couris
Summary: This study investigates the nonlinear optical response of functionalized silicon nanosheets and finds that samples functionalized with styrene and tBuMA exhibit strong saturable absorption and efficient optical limiting performance. These samples show potential applications in optical switching.
Article
Chemistry, Physical
Zhenjia Cheng, Yuqin Zhang, Xuan Liu, Chengshan Guo, Changwei He, Guiyuan Liu, Hongsheng Song
Summary: The study investigates a method for ultrafast time-resolved four-channel Jones matrix measurement of birefringent materials using an ultrafast laser. A four-channel angular multiplexing hologram can be acquired in a single shot, from which the Jones matrix information of a birefringent sample can be retrieved. The feasibility of this approach is demonstrated by measuring the Jones matrix of starch granules in microfluidic chips and the complex amplitude distribution and phase delay distribution of a liquid crystal cell at different voltages. Furthermore, it is found that ultrafast measurements are possible with a femtosecond laser as long as the time interval between two detection pulses is larger than the pulse width.
Article
Optics
Ebrahim Azmoudeh, Saeed Farazi
Summary: In this study, guided wave modes in uniaxial anisotropic hyperbolic metamaterials based on highly doped semiconductor in the mid-infrared region are investigated theoretically. The research focuses on the linear and nonlinear behavior of such multilayer metamaterials, exploring the impact of different structural arrangements on guided modes and transmission/reflection spectra. Additionally, the study demonstrates the potential for high-performance optical bistability and presents an ultrafast, low power, and high extinction ratio all-optical switch based on nonlinear highly doped semiconductor hyperbolic metamaterials.
Article
Engineering, Electrical & Electronic
Qiang Wu, Lei Gao, Zhenghu Chang, Yulong Cao, Ai Liu, Jingsheng Huang, Yu Long, Yuanjie Yu, Ligang Huang, Tao Zhu
Summary: Ultrafast lasers based on nonlinear polarization rotation have attracted attention for artificial saturable absorption induced by the Kerr effect. Although nonlinear polarization rotation laser cavity generally operates in the scalar regime due to its polarization-dependent device, occasional vector dynamics have been observed. However, coherence deterioration caused by nonlinear polarization evolution is rarely reported. In this study, we investigate the coherence deterioration in ultrafast laser systems based on nonlinear polarization rotation by finely tuning the birefringence of the cavity. By combining dispersive Fourier transform and division-of-amplitude, we can perform single-shot measurements of wavelength-resolved states of polarization. We find that birefringence-induced phase shift promotes wavelength-dependent polarization rotation and various polarization evolution speeds. In the coherence deteriorated states, optical polarization rogue waves at certain wavelengths are identified, while optical intensities show different irregular probability distributions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Physics, Applied
S. Meuret, L. H. G. Tizei, F. Houdellier, S. Weber, Y. Auad, M. Tence, H-C Chang, M. Kociak, A. Arbouet
Summary: This study reported time-resolved cathodoluminescence measurements in an ultrafast transmission electron microscope, achieving spatial resolution of 12 nm and temporal resolution of sub-nanoseconds.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Hongzhi Zhou, Yuzhong Chen, Haiming Zhu
Summary: The study reveals that photoexcitation in TMDs transfers to graphene through asynchronous charge transfer, with the rate correlated to the energy offset between TMD and graphene. By designing specific heterostructures, spin-polarized hole injection or long-lived polarized hole can be achieved.
Review
Chemistry, Multidisciplinary
Masaki Hada, Yuta Nishina, Takashi Kato
Summary: Molecular assemblies are widely used in functional soft materials, with liquid crystals being a representative example. Understanding the dynamic molecular behavior in liquid crystal states at the picosecond level is crucial for further functionalization. X-ray diffraction provides powerful insights into assembled structures, but limitations in time resolution hinder real-time observation. Ultrafast science and materials chemistry bring new opportunities for studying molecular dynamics at micro- to femtosecond scales.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Yuan Zhang, Junfeng Dai, Xiangli Zhong, Dongwen Zhang, Gaokuo Zhong, Jiangyu Li
Summary: Ferroelectric materials have been a key research topic due to their wide range of modern electronic and photonic applications. The ultrafast dynamics of ferroelectrics, explored through time-resolved pump-probe spectroscopy, have drawn considerable attention for their potential in understanding and utilizing dynamic processes. Through studying the ultrafast dynamics, insights can be gained to advance next-generation devices.
Article
Chemistry, Multidisciplinary
Sylvain David, Hao-Jung Chang, Cesar Lopes, Carl Braennlund, Boris Le Guennic, Gerard Berginc, Eric Van Stryland, Mykailo Bondar, David Hagan, Denis Jacquemin, Chantal Andraud, Olivier Maury
Summary: This study describes aza-boron dipyrromethenes with benzothiadiazole substitutions and investigates the impact of these substitutions on intramolecular charge transfer. The benzothiadiazole moiety enhances accepting strength, leading to improved optical power limiting performances. The substituted dyes show significantly enhanced two-photon absorption, making them a good starting point for further improvement of optical power limiting in the short-wave IR range.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Optics
Salimeh Tofighi, Natalia Munera, Matthew Reichert, David J. Hagan, Eric W. Van Stryland
Summary: The study used the polarization-sensitive, time-resolved Beam-Deflection technique to measure the nonlinear refraction of air and established a model for the pulsewidth-dependent nonlinear refractive index. The results showed that the nonlinear refractive index reaches its maximum at a pulsewidth of 0.5 ps, with the position being pressure-independent but the magnitude decreasing with increasing pressure and temperature.
Editorial Material
Materials Science, Multidisciplinary
Alexandra Boltasseva, David Hagan
Summary: The current Editor-in-Chief Alexandra Boltasseva and inaugural Editor-in-Chief David Hagan reflect on the past decade and celebrate the tenth anniversary of Optical Materials Express.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Chemistry, Multidisciplinary
Hao-Jung Chang, Mykhailo Bondar, Natalia Munera, Sylvain David, Olivier Maury, Gerard Berginc, Boris Le Guennic, Denis Jacquemin, Chantal Andraud, David J. Hagan, Eric W. Van Stryland
Summary: This study investigated the fast relaxation processes in the excited electronic states of functionalized aza-boron-dipyrromethene (aza-BODIPY) derivatives, including their linear photophysical, photochemical, and nonlinear optical properties. It was found that nonfluorescent derivatives exhibited optical gain in the near infrared range under femtosecond excitation. The study also discussed the role of bromine substituents in the molecular structures of these derivatives, and the excited states involved in electronic transitions were investigated using quantum-chemical TD-DFT calculations. The high two-photon absorption and excited-state absorption cross-sections, along with the measured photostability, suggest potential applications in photonics and optical limiting.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Correction
Optics
Dmitry A. Fishman, Claudiu M. Cirloganu, Scott Webster, Lazaro A. Padilha, Morgan Monroe, David J. Hagan, Eric W. Van Stryland
Article
Chemistry, Physical
Mykhailo Bondar, Sanaz Faryadras, Natalia Munera, Hao-Jung Chang, Mehrun Uddin, Kevin D. Belfield, Olexiy D. Kachkovsky, Eric W. Van Stryland, David J. Hagan
Summary: The linear and nonlinear optical properties of a new squaraine derivative with efficient near-infrared emission were comprehensively analyzed using spectroscopy, photochemistry, two-photon absorption measurements, and quantum chemical analysis. The electronic structure, rotational volumes, and extinction coefficient of the compound were studied, and its superluminescence emission and photostability were also investigated. The results suggest that this squaraine derivative has potential applications in two-photon fluorescent bioimaging and lasing.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Optics
Murat Yessenov, Sanaz Faryadras, Sepehr Benis, David J. Hagan, Eric W. Van Stryland, Ayman F. Abouraddy
Summary: This study investigates the refraction of space-time wave packets at the interface between two media and proposes a new refraction law. The application of space-time wave packets in ZnSe and CdSe confirms their ability to address large group-velocity mismatches in highly dispersive scenarios.
Article
Materials Science, Multidisciplinary
Sepehr Benis, Natalia Munera, Sanaz Faryadras, Eric W. Van Stryland, David J. Hagan
Summary: The researchers directly measured the nonlinear optical (NLO) phase shift of an Indium-Tin-Oxide (ITO) thin film using three different techniques. They found that centering the probe pulse at the ENZ position greatly enhances this phenomenon, while the excitation wavelength has a smaller effect. Additionally, they observed large-scale ultrafast cross-phase modulation and measured degenerate nonlinear refraction in ITO using the Z-scan method.
OPTICAL MATERIALS EXPRESS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Natalia Munera, Salimeh Tofighi, David J. Hagan, Eric Van Stryland
Summary: The ultrafast response function of air is used to predict the pulsewidth dependence of n(2,eff) from our measurements in the near and mid-infrared, showing agreement with multiple literature measurements.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Hao-Jung Chang, Mykhailo Bondar, Sylvain David, Oliver Maury, Gerard Berginc, Chantal Andraud, David J. Hagan, Eric W. Van Stryland
Summary: The nonlinear-optical properties of functionalized aza-borondipyrromethene chromophores in the near infrared were reported in this study. They have low fluorescence efficiencies and exhibit excited-state absorption and two-photon absorption at these wavelengths.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Hao-Jung Chang, Natalia Munera, Christian Keyser, Scott Webster, Eric W. Van Stryland, David J. Hagan
Summary: A common path interferometer was developed to measure refractive index in liquids across different wavelengths. Experimental data for various organic solvents at four wavelengths were presented in the study.
2021 IEEE RESEARCH AND APPLICATIONS OF PHOTONICS IN DEFENSE CONFERENCE (RAPID)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Sanaz Faryadras, Nicholas Cox, David J. Hagan, Eric W. Van Stryland
Summary: The study investigates non-degenerate two-photon absorption across the indirect gap of silicon, explaining three theoretical pathways for the two photons and a phonon, determining the most dominant process through comparison with measurements, and observing the enhancement of ND-2PA.
2021 IEEE RESEARCH AND APPLICATIONS OF PHOTONICS IN DEFENSE CONFERENCE (RAPID)
(2021)
