Article
Physics, Multidisciplinary
Guilhem Madiot, Ryan C. Ng, Guillermo Arregui, Omar Florez, Marcus Albrechtsen, Soren Stobbe, Pedro D. Garcia, Clivia M. Sotomayor-Torres
Summary: This study investigates the optomechanical generation of coherent phonons at 6.8 GHz frequency, operating at room temperature. By using a suspended 2D silicon phononic crystal cavity with an air-slot, the phononic waveguide is turned into an optomechanical platform that allows for fine control of phonons using light. This development could potentially lead to the advancement of phononic circuitry and coherent manipulation of other solid-state properties.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Nan Gao, Jiao Wang, Weiqiu Chen
Summary: This paper realizes the Klein tunneling phenomenon in elastic plate waves by structural design, providing direction and reference for the design and application of phononic crystal devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Acoustics
Jyotsna Dhillon, Ezekiel Walker, Arkadii Krokhin, Arup Neogi
Summary: This study reports the use of nonreciprocity in the transmission band to trap energy inside a phononic crystal cavity, which is different from the widely used defect mode induced energy trapping mechanism. Passive nonreciprocity is achieved through the natural viscosity of the background liquid (water) and the asymmetry of aluminum scatterers. Experimental results show enhanced energy trapping at a frequency of 624 kHz when nonreciprocity suppresses acoustic radiation into the environment. Finite element numerical analysis further investigates and confirms the experimental findings.
Article
Crystallography
Mohd Syafiq Faiz, Norazreen Abd Aziz
Summary: In this study, a mono-channel waveguide with alternate hollow pillars of different radius was numerically simulated using the Finite Element Method (FEM). The propagation behavior of elastic waves on the waveguide structure was studied by computing the dispersion relation, transmission coefficient, and stress displacement profile of the waveguides. The results showed that the proposed model can achieve tailorable frequency shift within the bandgap region by optimizing the inner radius of hollow pillar.
Article
Acoustics
Nurettin Korozlu, Ahmet Bicer, Done Sayarcan, Olgun Adem Kaya, Ahmet Cicek
Summary: In this study, a two-dimensional phononic crystal linear defect waveguide is used to sort solid particles of different sizes in the air through acoustic radiation force. The proposed approach can be employed in applications where contact-free separation of airborne particles is required.
Article
Nanoscience & Nanotechnology
Yueting Wang, Jian Li, Yuxin Fu, Ronghao Bao, Weiqiu Chen, Yue-Sheng Wang
Summary: The article investigates the deformation behavior and wave propagation characteristics of a defected phononic crystal, showing that localized states appear due to the presence of the line defect. The results suggest that the phononic crystal with line defect can control guided waves through uniaxial compression, paving a new way for designing tunable elastic waveguides.
Article
Materials Science, Multidisciplinary
Chengxin Cai, Guangchen He, Zhoufu Zheng, Yao Qin, Jianfei Yin
Summary: In this study, the edge states of a designed elastic phononic crystal plate were modulated to achieve greater degrees of freedom and enhanced backscattering suppression capabilities. Straight boundary, right-angle turning boundary, and valley topological transport with defect and disordered boundary were achieved by utilizing edge states. Experimental validation confirmed the robustness against immunodeficiency and holes. The relative width of the topological band gap in the elastic wave system examined in this study exceeds 60%, offering significant advantages and potential for practical applications. This research contributes new insights for engineering applications of ultra-wideband acoustic antennas, acoustic logic control, and other devices.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Characterization & Testing
Geoffrey Roger Sherwood, Dimitrios Chronopoulos, Andrea Marini, Francesco Ciampa
Summary: Utilizing phononic crystal waveguide transducers can enhance the damage sensitivity of nonlinear ultrasound methods for detecting material micro-cracks by filtering out unwanted second harmonic waves, improving the accuracy of signal measurements.
NDT & E INTERNATIONAL
(2021)
Article
Physics, Multidisciplinary
Myung-Joon Lee, Il-Kwon Oh
Summary: This study demonstrates independent tuning of in-plane and out-of-plane topological modes in a phononic crystal by geometrically modifying its symmetry. By introducing rich polarization into the valley degree of freedom, the researchers achieve topologically protected separation of elastic waves and overcome the issue of overlapping oscillation modes with different polarizations.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Applied
Katerina Stojanoska, Chen Shen
Summary: This work proposes a non-Hermitian planar elastic metasurface that achieves unidirectional focusing of flexural waves by introducing tunable material loss and adjusting the reflected phase. Experimental results demonstrate that the metasurface can focus the incident wave energy from one direction and achieve zero reflection in the other direction.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Jiahui Zhang, Feng Xu, Ran An, Lin Wang, Min Jiang, Guanghui Wang, Yanqing Lu
Summary: The study proposes an efficient fluorescence excitation and collection system using an integrated GaN chip. The system utilizes a slot waveguide to confine excitation light and introduces a one-dimensional photonic crystal waveguide to filter out fluorescence signals and enable multiple excitations. Through numerical analysis, the total fluorescence collection efficiency is determined to be 15.93%. This study introduces the concept of an integrated chip fluorescence detection system, paving the way for miniaturized and portable devices in biomedical fluorescence detection.
CHINESE OPTICS LETTERS
(2023)
Article
Physics, Applied
Fuyin Ma, Zhen Huang, Chongrui Liu, Jiu Hui Wu
Summary: This tutorial provides a comprehensive overview of the basic principles and traditional methods of acoustic focusing and imaging. It further discusses the progress in sub-wavelength focusing and super-resolution imaging achieved through artificial acoustic devices such as phononic crystals and acoustic metamaterials. The tutorial also explores the potential future trends and practical application prospects in this field.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Shao-yong Huo, Guan-hong Xie, Shi-jia Qiu, Xiao-chao Gong, Shao-zhang Fan, Chun-ming Fu, Zhen-ye Li
Summary: An elastic wave broadband topological valley-locked waveguide state (TVWS) with adjustable mode width is achieved by adjusting the height of triangular pillars in a phononic crystal plate with asymmetric double-sided pillars. The TVWS features gapless dispersion and robustness against bends and disorders, and allows for the demonstration of an elastic valley-locked waveguide splitter with variable mode width.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Ze Ma, Yang Liu, Yu-Xin Xie, Yue-Sheng Wang
Summary: The study extends the investigation of topological insulator devices to the field of elastic waves, and demonstrates tunable topological valley transmission with an elastic phononic crystal plate. The topological property is confirmed through calculation of topological invariants, and the immunity to defects, sharp bends, and disturbances is verified through experiments and simulations.
EXTREME MECHANICS LETTERS
(2022)
Article
Optics
Junchi Zhang, William Donaldson, Govind P. Agrawal
Summary: This study demonstrates the formation of a Raman-induced temporal waveguide by launching short pump and probe pulses inside a photonic crystal fiber. The pump pulse creates a fundamental soliton with continuously changing speed due to the Raman-induced red shift of its spectrum. The spectrum of the probe pulse is blue-shifted to ensure that both pulses move at the same speed and trajectory over the entire length of the fiber. The output wavelengths of the pulses depend on the peak power of the input pump pulses and agree with the predictions based on dispersion data.
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
Hiroshi Yamaguchi, Samer Houri
Summary: The research investigates the theoretical and numerical generation and propagation of a topological soliton using a coupled parametric resonator array. The topological protection of the soliton, triggered propagation by switching resonator phase, and effects of damping, collision, and harmonic drive on propagation dynamics are studied. The study also explores the implementation of a topological soliton using electromechanical resonators for precise electrical control of propagation dynamics.
PHYSICAL REVIEW APPLIED
(2021)
Article
Nanoscience & Nanotechnology
D. Hatanaka, H. Yamaguchi
Summary: The acoustically driven spin-wave resonance in a phononic-crystal cavity is numerically investigated, showing the potential to control spin-wave dynamics with ultrasmall and inhomogeneous mode structures. One specific monopole-like mode in the cavity can provide a versatile acoustic excitation scheme independent of the field-angle variation, offering a key technology for large-scale magnomechanical circuits.
Article
Physics, Applied
Megumi Kurosu, Daiki Hatanaka, Hajime Okamoto, Hiroshi Yamaguchi
Summary: The research team successfully fabricated and characterized a silicon phonon waveguide structure with PZT piezoelectric transducers, enabling the evaluation of nonlinearity. They observed a softening nonlinear response as a function of drive power and demonstrated the ability for mode shift and frequency conversion.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
News Item
Physics, Multidisciplinary
H. Yamaguchi, D. Hatanaka
Article
Physics, Applied
D. Hatanaka, M. Asano, H. Okamoto, Y. Kunihashi, H. Sanada, H. Yamaguchi
Summary: This article reports a planar cavity magnomechanical system that uses standing acoustic waves to enhance spatial and spectral power density, achieving magnified magnon-phonon coupling. This system provides a new method for the coherent acoustic control of magnons and the development of spin-acoustic technologies.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Wataru Tomita, Satoshi Sasaki, Motoki Asano, Kouta Tateno, Hajime Okamoto, Hiroshi Yamaguchi
Summary: In this study, a nanowire-based electromechanical resonator device with vacuum-gap and orthogonally aligned double-gate geometry is used to independently control two nearly degenerate orthogonal vibration modes. The piezoresistance mechanism dominates the motion-induced conductance variation in the device, providing an efficient method for converting vibrational motion into an electric signal. By applying two gate voltages simultaneously, an opposite combined effect on the frequency shift between the two vibration modes is achieved, which is well explained by model calculations. This study demonstrates the vectorial control of two mode frequencies using the opposite double-gate effect, which is not possible with single-gate geometry.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Motoki Asano, Hiroshi Yamaguchi, Hajime Okamoto
Summary: This study introduces a new probe technology using twin-microbottle resonators to achieve high-performance sensing of liquid samples. This technique enables in situ metrology in arbitrary media and has the potential to be applied in ultrasensitive biochips and rheometers.
Article
Physics, Applied
Katsuhiko Nishiguchi, Hiroshi Yamaguchi, Akira Fujiwara, Herre S. J. van der Zant, Gary A. Steele
Summary: We have demonstrated charge detection with single-electron resolution at high readout frequency using a silicon field-effect transistor integrated with double resonant circuits. The transistor, with a channel width of 10 nm, can detect a single electron at room temperature. The transistor is connected to resonant circuits composed of coupled inductors and capacitors, providing two resonance frequencies. By driving the transistor with a carrier signal at the lower resonance frequency, a small signal applied to the transistor's gate modulates the resonance condition, resulting in a reflected signal appearing near the higher resonance frequency. This operation allows for charge detection with a single-electron resolution of 3 x 10(-3) e/Hz(0.5) and a readout frequency of 200 MHz at room temperature.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Katsuhiko Nishiguchi, Hiroshi Yamaguchi, Akira Fujiwara
Summary: We detect the mechanical oscillations of a nanoelectromechanical system (NEMS) composed of a multilayer-graphene (MLG) membrane using a Si field-effect transistor (FET) and a microwave probe connected to double-resonant circuits. The mechanical oscillations of the MLG membrane as it functions as the gate of the FET are monitored through modulation of the FET's impedance. This rf-signal-driven readout at 340 MHz allows for highly sensitive and functional sensors for small mass and quantum mechanics as well as timing devices.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Motoki Asano, Hiroshi Yamaguchi, Hajime Okamoto
Summary: In this study, a sub-femtogram resolution in-liquid cavity optomechanical mass sensor based on the twin-microbottle glass resonator is demonstrated. Evaluation of the frequency stability using an optomechanical phase-locked loop shows that this sensor provides the highest mass resolution of (7.0 +/- 2.0) x 10(- 16)g in water, which is four orders of magnitude better than the first-generation setup. The highly sensitive mass sensor can be utilized as a free-access optomechanical probe in liquid for various in situ chemical and biological metrology applications.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Applied
M. Kurosu, D. Hatanaka, R. Ohta, H. Yamaguchi, Y. Taniyasu, H. Okamoto
Summary: We have demonstrated an almost impedance-matched high-overtone bulk acoustic resonator (HBAR) operating at super high frequency ranges. It utilizes an epitaxial AlN piezoelectric layer directly grown on a conductive SiC cavity substrate without the need for a metal layer insertion. Our HBAR achieves broadband phonon cavity modes up to the K-band (26.5 GHz) and has a high figure of merit of f x Q=1.3x10(13) Hz at 10 GHz. This technology holds great potential for the development of microwave signal processing devices for 5G and future 6G communication systems, as well as research on high-frequency acoustic systems hybridized with electric, optical, and magnetic systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Daiki Hatanaka, Motoki Asano, Hajime Okamoto, Hiroshi Yamaguchi
Summary: Phononic crystals (PnC) can confine phonons in a small area due to a band gap, enhancing their interaction with different systems. In this study, PnC is used to manipulate magnons via ultrahigh frequency phonons confined in a phononic cavity, exciting magnons in a micromagnet through magnetostriction. Furthermore, the magnetoelastic interaction is modulated by selectively exciting cavity resonant modes. These results open up new possibilities for PnC cavity magnomechanics and universal controls of ultrahigh frequency magnons and phonons with PnC circuits.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Multidisciplinary
V. A. Seleznev, V. S. Tumashev, H. Yamaguchi, V. Ya. Prinz
Summary: A new method for fabricating large-area metal and semiconductor nanobridge arrays is proposed in this article, which combines the possibilities offered by nanotransfer printing and UV lithography. The method involves imprinting an array of nanostrips into a resist layer and subsequent UV exposure through an additional mask to define the regions where suspended nanostrip bridges will be formed. Using this method, large-area arrays of Au and Ti/Au nanobridge, as well as SiGe nanobridge arrays, were successfully fabricated. The proposed method is simple, low-cost, and can be implemented on solid and polymer substrates.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Motoki Asano, Takuma Aihara, Tai Tsuchizawa, Hiroshi Yamaguchi
Summary: This study demonstrates the use of fully quadratic measurement-feedback protocol in a micromechanical resonator to achieve noise reduction, unveiling the mechanism of noise reduction through effective cooling effects.
PHYSICAL REVIEW RESEARCH
(2021)