Related Experiment Video
Updated: Jun 9, 2025
10:26
Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
11.3K
Strain-Induced Frequency Splitting in PT Symmetric Coupled Silicon Resonators
Lifeng Wang1, Shangyang Zhang1, Qunce Yuan1
1Key Laboratory of MEMS of the Ministry of Education, School of Electronic Science & Engineering, Southeast University, Nanjing 210096, China.
Micromachines
|October 26, 2024
Summary
This study demonstrates strain-induced frequency splitting in parity-time (PT) symmetric-coupled silicon resonators. The PT system shows enhanced sensitivity to strain near the exceptional point, validated through fabrication and experiment.
Area of Science:
- Photonics and optical engineering
- Non-Hermitian physics
- Materials science
Background:
- Parity-time (PT) symmetry in coupled resonators offers unique non-Hermitian properties.
- Silicon photonics provides a robust platform for realizing complex optical systems.
Purpose of the Study:
- To investigate strain-induced frequency splitting in PT symmetric-coupled silicon resonators.
- To explore the enhanced sensitivity of PT systems to strain near exceptional points.
Main Methods:
- Theoretical derivation and numerical simulation of frequency splitting under strain.
- Design of a feedback circuit for negative damping to achieve PT symmetry.
- Fabrication of silicon-on-insulator (SOI) resonator chips.
- Experimental construction and testing of PT-symmetric-coupled silicon resonators.
Main Results:
- Frequency splitting in PT symmetric-coupled silicon resonators due to strain was theoretically predicted and simulated.
- The PT system exhibits heightened sensitivity to strain perturbations near the exceptional point (EP).
- Experimental fabrication and successful demonstration of strain-induced frequency splitting in the PT-symmetric system were achieved.
Conclusions:
- Strain-induced frequency splitting is a viable phenomenon in PT symmetric-coupled silicon resonators.
- The enhanced sensitivity near the EP presents opportunities for highly sensitive strain sensors.
- The successful fabrication and experimental validation pave the way for practical applications of PT-symmetric photonic devices.
Related Concept Videos
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
925
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
925
01:12Double Resonance Techniques: Overview
191
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...
191
01:13¹H NMR: Complex Splitting
1.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.2K
01:19Concept of Resonance and its Characteristics
5.0K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
5.0K
01:14Sound Waves: Resonance
2.5K
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...
2.5K
01:17Design Example: Underdamped Parallel RLC Circuit
268
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
Starting with a fixed...
268