Related Experiment Video
Updated: Aug 14, 2025
06:51
Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
7.1K
Mechano/acousto-electric coupling between ReS2and surface acoustic wave
Jinxi Zhang1, Chen Wu1, Qiankun Zhang2
1State Key Laboratory of Precision Measurement Technology and Instrument, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, No. 92 Weijin Road, Tianjin, 300072, People's Republic of China.
Nanotechnology
|January 18, 2023
Summary
This study introduces a surface acoustic wave (SAW) device for precisely controlling mechanical strain in two-dimensional (2D) materials. This platform enables tunable electronic and optoelectronic properties in 2D materials for advanced devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) materials offer tunable properties for next-generation electronics.
- Mechanical strain is a key stimulus for modulating 2D material properties.
- Controllable micro/nano scale strain application platforms are underdeveloped.
Purpose of the Study:
- To present a surface acoustic wave (SAW) device as a controllable strain modulation platform for 2D materials.
- To achieve sub-micro scale resolution in strain application.
- To explore mechano-electrical and optoelectrical coupling in 2D materials.
Main Methods:
- Utilizing a lithium niobate (LiNbO3) piezoelectric substrate with interdigitated transducers (IDTs).
- Generating surface acoustic waves (SAWs) to induce surface deformation and strain on 2D materials.
- Analyzing photoluminescence (PL) spectrum shifts and resonant frequency changes.
Main Results:
- Demonstrated tunable photoluminescence spectrum shifts in 2D ReS2 flakes with SAW power (3 nm shift at 26 dBm).
- Observed a corresponding band gap increase of 5 meV due to strain.
- Showcased acousto-electric coupling via shifts in SAW resonant frequency due to photo-carrier redistribution.
Conclusions:
- The SAW device provides a high-resolution platform for strain engineering in 2D materials.
- This platform enables precise control over the optoelectronic properties of 2D materials.
- The study highlights the potential for novel mechano-electrical/optoelectrical devices based on 2D materials and SAW interactions.
Related Concept Videos
01:14Sound Waves: Resonance
2.7K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.7K
01:12Double Resonance Techniques: Overview
260
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
260
01:28Standing Waves in a Cavity
987
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
987
01:26Resonance in an AC Circuit
2.1K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.1K
00:53Sound Waves: Interference
3.8K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.8K
01:17Sound as Pressure Waves
2.5K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
The pressure fluctuation depends on the difference in displacements between the successive points in the...
2.5K