Related Experiment Video
Updated: Sep 13, 2025
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
19.1K
Acoustic wave modulation of gap plasmon cavities.
Skyler P Selvin1,2, Majid Esfandyarpour1, Anqi Ji1,2
1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA.
Science (New York, N.Y.)
|July 31, 2025
Summary
Researchers electrically tuned light scattering using surface acoustic waves and gap plasmons. This high-speed manipulation of metallic nanostructures opens new avenues for dynamic metasurfaces.
Area of Science:
- Nanophotonics
- Plasmonics
- Materials Science
Background:
- Metallic nanostructures are crucial in nanophotonics.
- Electrical manipulation of their optical resonances at high speeds is a key challenge.
- Gap plasmons offer extreme light concentration for enhanced optical effects.
Purpose of the Study:
- To develop a method for electrically manipulating optical resonances of metallic nanostructures at high speeds.
- To explore the use of surface acoustic waves (SAWs) for tuning light scattering.
- To investigate the dynamics of polymer spacers under acoustic wave influence.
Main Methods:
- Utilized a particle-on-mirror configuration with gold nanoparticles and a thin, compressible polymer spacer.
- Applied electrically driven surface acoustic waves to induce mechanical deformations in the polymer.
- Analyzed light scattering changes in response to SAWs, approaching gigahertz frequencies.
Main Results:
- Achieved high-speed electrical tuning of light scattering from metallic nanostructures.
- Observed significant spectral tuning attributed to nonlinear mechanical dynamics and large strain in the polymer.
- Demonstrated tuning speeds approaching the gigahertz regime.
Conclusions:
- The proposed approach enables electrically driven dynamic metasurfaces.
- Provides a platform for fundamental studies of high-frequency polymer dynamics in confined environments.
- Highlights the potential of SAWs for advanced nanophotonic device control.
Related Concept Videos
01:28Standing Waves in a Cavity
1.0K
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:
1.0K
01:17Sound as Pressure Waves
2.6K
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...
2.6K
01:07Propagation of Waves
2.4K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.4K
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
01:01Sound Waves
9.5K
Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
9.5K