Article
Acoustics
Motonobu Tomoda, Hiroyuki Matsuo, Osamu Matsuda, Roberto Li Voti, Oliver B. Wright
Summary: In this study, picosecond acoustic strain pulses in a transparent medium were visualized using an ultrafast optical technique, with tomographic imaging achieved at GHz frequencies. The reconstructed strain distribution had high temporal and spatial resolutions, enabling imaging of strain, carrier, and temperature distributions on ultrashort timescales.
Article
Physics, Multidisciplinary
Yu Ji, Chang-Wang Lian, Rui Yan, Chuang Ren, Dong Yang, Zhen-Hua Wan, Bin Zhao, Chen Wang, Zhi-Heng Fang, Jian Zheng
Summary: The study conducted PIC simulations of laser plasma instabilities under specific experimental conditions and found that when the incident laser intensity exceeds a certain threshold, it can trigger secondary stimulated Raman scattering effects, amplifying the backscattered light waves and depleting the primary BSRS light wave.
MATTER AND RADIATION AT EXTREMES
(2021)
Article
Chemistry, Multidisciplinary
Wenjing Yan, Andrey Akimov, Joseph A. Page, Mark T. Greenaway, Alexander G. Balanov, Amalia Patane, Anthony J. Kent
Summary: The study investigates the intralayer and interlayer bondings in the alpha and beta polytypes of In2Se3, a vdW material with potential applications in advanced electronic and optical devices. The differences in sound velocity and elastic properties between the alpha- and beta-In2Se3 are examined through picosecond ultrasonic experiments, revealing the significant contribution of interlayer atomic bonding to their distinct elastic properties.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Ning Wang, He Wen, Juan Carlos Alvarado Zacarias, Jose Enrique Antonio-Lopez, Yuanhang Zhang, Daniel Cruz Delgado, Pierre Sillard, Axel Schulzgen, Bahaa E. A. Saleh, Rodrigo Amezcua-Correa, Guifang Li
Summary: Laser, as one of the greatest inventions in history, has been widely applied and had a profound impact on society. However, previous lasers can only operate in one physical domain. In this study, we have experimentally demonstrated the simultaneous lasing of photons and phonons in a two-mode silica fiber ring cavity. This multidomain laser has the potential to be applied in various fields such as optomechanical sensing, microwave generation, and quantum information processing.
Article
Optics
Duo Jin, Zhenxu Bai, Yifu Chen, Wenqiang Fan, Yulei Wang, Zhiwei Lu, Richard P. Mildren
Summary: This study reveals that the cascade operation of Brillouin lasers is a barrier to single-frequency power scaling and further compression of the fundamental linewidth. By selecting Brillouin gain media with high sound velocity, large refractive index, and narrow linewidth, the second Stokes can be suppressed, leading to cascade-free intramode scattering in diamond. This study elucidates a route to single-frequency, narrow-linewidth Brillouin lasers via Brillouin material selection.
Article
Acoustics
Motonobu Tomoda, Akira Toda, Osamu Matsuda, Vitalyi E. Gusev, Oliver B. Wright
Summary: Time-domain Brillouin scattering (TDBS) is an optical experimental technique that uses laser picosecond ultrasonics to investigate transparent materials. It has various applications, including imaging thin-films, polycrystalline materials, biological cells, and studying physical properties such as residual stress, temperature gradients, and nonlinear coherent nano-acoustic pulses. In this study, a new method is presented for extracting sound velocity in TDBS without knowing the refractive index, by using probe light obliquely incident on the side face of the sample instead of the usual top face. The method is demonstrated using a fused silica sample with a titanium transducer film, and the sound velocity is mapped in the depth direction. Future applications include mapping the three-dimensional sound velocity distribution in inhomogeneous samples, particularly in biological cell imaging.
Article
Optics
Zhenpeng Deng, Lingzhi Li, Jiejun Zhang, Jianping Yao
Summary: A single-longitudinal-mode narrow-linewidth fiber ring laser with stimulated Brillouin scattering (SBS) assisted parity-time (PT) symmetry is proposed and experimentally demonstrated for mode selection in a single fiber loop. By controlling the angle between the polarization directions of the pump and the Stokes light waves, the gain and loss coefficients between the counterpropagating light waves can be balanced, achieving single-mode lasing output.
Article
Multidisciplinary Sciences
Guqi Yan, Sylvain Monnier, Maleke Mouelhi, Thomas Dehoux
Summary: Volume regulation is crucial for maintaining tissue functions, and it involves modulation of molecular crowding and water efflux. This study used Brillouin light scattering to investigate volume variations and proposed a model to explain the observed phenomena.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Wang Chen, An Hong-Hai, Xiong Jun, Fang Zhi-Heng, Ji Yu, Lian Chang-Wang, Xie Zhi-Yong, Guo Er-Fu, He Zhi-Yu, Cao Zhao-Dong, Wang Wei, Yan Rui, Pei Wen-Bing
Summary: Laser plasma interaction (LPI) is a crucial aspect in research related to inertial confinement fusion, with various beam smoothing methods developed by major laboratories. However, further in-depth studies are needed due to the inadequate understanding and suppression of LPI. Experimental research using picosecond laser driving of LPI has shown interference signals affecting the estimation of true backward scatter signals such as SBS.
ACTA PHYSICA SINICA
(2021)
Article
Optics
Wei-Wei Ke
Summary: Phase modulation is a significant method for increasing the threshold of stimulated Brillouin scattering (SBS) in optical fibers. The mainstream theoretical model, the transient three-wave coupling model, lacks a direct relation between laser phase and Stokes light. This paper applies the undepleted pump approximation to the transient three-wave coupling model and derives equations that describe the evolution of Stokes light in both time and frequency domains. The equations establish a direct relationship between laser phase and Stokes light, with all terms having clear physical interpretations. Numerical validation against the original coupling model demonstrates good agreement when the Stokes average reflectivity is below 1%, the usual definition of SBS threshold.
OPTICS COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Moritz Merklein, Birgit Stiller, Khu Vu, Pan Ma, Stephen J. Madden, Benjamin J. Eggleton
Summary: Breaking the symmetry between forward- and backward-propagating optical modes enables crucial functionalities, but achieving integrated broadband nonreciprocal signal processing functionalities on-chip remains challenging. This study demonstrates a nonreciprocal delay scheme based on the unidirectional transfer of optical data pulses to acoustic waves, showcasing a bandwidth more than an order of magnitude broader than the intrinsic optoacoustic linewidth and wavelength-preserving capabilities.
Article
Biochemistry & Molecular Biology
Yinan Zhang, Shiren Chen, Jing Han
Summary: All-dielectric nanoparticles demonstrate broadband forward scattering across the entire visible range by utilizing optical interferences between electric and magnetic dipole modes, showing great potential in various applications such as light harvesting, photodetection, and on-chip photonic devices.
Article
Acoustics
Rafael Fuentes-Dominguez, Mengting Yao, William Hardiman, Salvatore La Cavera III, Kerry Setchfield, Fernando Perez-Cota, Richard J. Smith, Matt Clark
Summary: In this paper, the authors demonstrate a proof-of-concept method to parallelise phonon microscopy measurements for cell elasticity imaging. By using a multi-core fibre bundle for detection, they achieve a 3-fold increase in acquisition speed compared to current hardware limitations. This method, based on time-resolved Brillouin scattering and asynchronous optical sampling (ASOPS), allows access to cell elasticity with sub-optical axial resolution.
Review
Physics, Multidisciplinary
Chen Cao, Yulei Wang, Zhenxu Bai, Yunfei Li, Yu Yu, Zhiwei Lu
Summary: The article reviews the development status of SBS pulse compression schemes and proposes methods and trends for optimizing SBS pulse compression.
FRONTIERS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sathyan Sandeep, Alexey S. Vishnevskiy, Samuel Raetz, Sergej Naumov, Dmitry S. Seregin, Artem Husiev, Konstantin A. Vorotilov, Vitalyi E. Gusev, Mikhail R. Baklanov
Summary: The characterization of porogen-based organosilicate glass (OGS) films deposited by spin-on-glass technology was carried out using time-domain Brillouin scattering (TDBS). Remarkable differences between the films were revealed through the temporal evolution of the Brillouin frequency (BF) shift in TDBS experiments. The observed modification of the BF was correlated to the amount of carbon residue in the samples, the use of ultraviolet (UV) femtosecond probe laser pulses, and their intensity. The possibility of local modifications of OSG films with a nanometric resolution via nonlinear optical processes was demonstrated.
Article
Materials Science, Multidisciplinary
Travis D. Frazer, Joshua L. Knobloch, Jorge N. Hernandez-Charpak, Kathleen M. Hoogeboom-Pot, Damiano Nardi, Sadegh Yazdi, Weilun Chao, Erik H. Anderson, Marie K. Tripp, Sean W. King, Henry C. Kapteyn, Margaret M. Murnane, Begona Abad
PHYSICAL REVIEW MATERIALS
(2020)
Article
Physics, Applied
Claudia Cancellieri, Ethan A. Scott, Jeffrey Braun, Sean W. King, Ron Oviedo, Christopher Jezewski, John Richards, Fabio La Mattina, Lars P. H. Jeurgens, Patrick E. Hopkins
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Ethan A. Scott, Jeffrey L. Braun, Khalid Hattar, Joshua D. Sugar, John T. Gaskins, Mark Goorsky, Sean W. King, Patrick E. Hopkins
Summary: This study focuses on the thermal conductivity of amorphous carbon created in diamond via nitrogen ion implantation. Various measurement techniques are used to investigate its thermal properties, revealing a thermal conductivity of approximately 1.4Wm -1 K -1, comparable to that of amorphous carbon films fabricated through other methods.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Ethan A. Scott, Sean W. King, Nanette N. Jarenwattananon, William A. Lanford, Han Li, James Rhodes, Patrick E. Hopkins
Summary: The thermal conductivity of amorphous solids can be increased through ion irradiation, altering the bonding network configuration. Films with higher initial hydrogen content show the greatest enhancement, accompanied by stiffening and densification from the irradiation process. This enhancement in vibrational transport is unique compared to the structural degradation and reduced thermal conductivity typically seen in ion conductivities of crystalline materials.
Article
Materials Science, Multidisciplinary
Jeffrey L. Braun, Sean W. King, Eric R. Hoglund, Mehrdad Abbasi Gharacheh, Ethan A. Scott, Ashutosh Giri, John A. Tomko, John T. Gaskins, Ahmad Al-kukhun, Gyanendra Bhattarai, Michelle M. Paquette, Georges Chollon, Benjamin Willey, G. Andrew Antonelli, David W. Gidley, Jinwoo Hwang, James M. Howe, Patrick E. Hopkins
Summary: This study thoroughly investigated the thermal conductivity of hydrogenated amorphous silicon nitride (a-SiNx:H) and found that hydrogen incorporation disrupts bonding among silicon and nitrogen atoms, leading to significant variations in heat transfer. Chemical, vibrational, and structural analysis revealed that changes in hydrogen content directly impact the thermal conductivity by affecting average atomic distances.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Applied
Elias B. Frantz, David J. Michalak, Nicholas J. Harmon, Eric M. Henry, Stephen J. Moxim, Michael E. Flatte, Sean W. King, James S. Clarke, Patrick M. Lenahan
Summary: The study investigates the effects of silicon isotopic abundance on EDMR and NZFMR effects observed on unpassivated Si/SiO2 metal-insulator-semiconductor capacitors. The results show a significant narrowing of the NZFMR response upon removal of Si-29 nuclei, with superhyperfine interactions playing a crucial role in determining the response breadth. It is strongly suggested that leakage currents involve tunneling from Si/SiO2 P-b dangling bonds to defects within the oxide, indicating a dominant role of Si/SiO2 interface trap defects in the observed phenomena.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Elias B. Frantz, David J. Michalak, Nicholas J. Harmon, Eric M. Henry, Michael E. Flatte, Sean W. King, James S. Clarke, Patrick M. Lenahan
Summary: The study provides insights into the tunneling phenomenon in Si/SiO2, showing that the trap-assisted tunneling spectra are dominated by silicon dangling bonds at the Si/SiO2 interface. The presence of Si-29 nuclei and hydrogen greatly affects the NZFMR response, indicating the importance of interface trap defects in the tunneling process.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Elias B. Frantz, Nicholas J. Harmon, David J. Michalak, Eric M. Henry, Michael E. Flatte, Sean W. King, James S. Clarke, Patrick M. Lenahan
Summary: This study investigates the low-frequency EDMR and NZFMR responses observed on unpassivated Si-28/(SiO2)-Si-28 MIS capacitors, demonstrating the connection between the spin-mixing mechanism and NZFMR response. By fitting the spectra, a dipolar coupling constant can be extracted, suggesting magnetic dipolar interactions between P-b centers at the interface are responsible for the NZFMR response in the absence of electron-nuclear hyperfine interactions.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sandip Thakur, Connor Jaymes Dionne, Pravin Karna, Sean W. King, William Lanford, Han Li, Shouvik Banerjee, Devin Merrill, Patrick E. Hopkins, Ashutosh Giri
Summary: This study investigates the effects of mass density and atomic coordination on the thermal conductivity and vibrational characteristics of amorphous silicon carbide systems. The results reveal the significant role of atomic coordination in dictating the contributions from propagating and nonpropagating modes.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Gheorghe Stan, Cristian V. Ciobanu, Sean W. King
Summary: Atomic force microscopy (AFM) is a widely used tool for surface characterization, capable of quantitatively determining the depth and mechanical properties of thin films. It offers nondestructive and robust techniques for probing layer thickness, subsurface features, and elastic properties in various fields such as semiconductor electronics, additive manufacturing, and biomaterials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Vamseedhara Vemuri, Sean W. King, William A. Lanford, John T. Gaskins, Patrick Edward Hopkins, Jeremy Van Derslice, Han Li, Nicholas C. Strandwitz
Summary: Thermal processing of MLD alucone films can produce porous and low-k materials. The chemical evolution of the films during heating was studied using various spectroscopy techniques. The lowest dielectric constant of the processed alucone films was lower than that of ALD alumina films.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Rupak Thapa, Lauren M. Dorsett, Raja Sekhar Bale, Suhaib Malik, Stefan C. Wagner, Derrick Bailey, Jacob Stoehr, Anthony N. Caruso, Jeffery D. Bielefeld, Sean W. King, Michelle M. Paquette
Summary: Carborane (C2B10H12) molecules are unique precursors for self-assembled monolayer (SAM) applications. These 3D, icosahedral (12-vertex) molecules allow for well-ordered layers formation with fewer defects compared to traditional linear alkyl SAMs. Post-growth treatments like heat and plasma can be used to crosslink and stabilize the films. These carborane thiol SAMs show stability to thermal and plasma treatment, with some changes in boron coverage and oxidation. The films can be further stabilized and modified by plasma treatment and may have various applications in functional and protective layers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
E. Thompson, E. Manzella, E. Murray, M. Pelletier, J. Stuligross, B. C. Daly, S. H. Lee, R. Redwing
MATERIALS TODAY CHEMISTRY
(2020)
Review
Engineering, Electrical & Electronic
Gheorghe Stan, Sean W. King
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)
Article
Engineering, Electrical & Electronic
Michelle M. Paquette, Anthony N. Caruso, Justin Brockman, Jeff Bielefeld, Markus Kuhn, Sean W. King
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)