Related Experiment Video
Updated: Aug 25, 2025
08:53
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
Published on: December 29, 2015
9.3K
A Nanoscale Sensor Based on a Toroidal Cavity with a Built-In Elliptical Ring Structure for Temperature Sensing
Feng Liu1,2,3, Shubin Yan2,3, Lifang Shen2
1School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China.
Nanomaterials (Basel, Switzerland)
|October 14, 2022
Summary
A novel refractive index sensor utilizing Fano resonance in a metal-insulator-metal waveguide and toroidal cavity structure demonstrates high sensitivity. This sensor shows potential for applications in precise temperature detection.
Area of Science:
- Photonics and Nanophotonics
- Optical Sensing Technologies
Background:
- Refractive index sensors are crucial for various detection applications.
- Fano resonance in coupled structures offers unique sensing capabilities.
Purpose of the Study:
- To design and analyze a novel refractive index sensor based on Fano resonance.
- To investigate the sensor's performance and potential applications.
Main Methods:
- Utilized a metal-insulator-metal waveguide coupled with a toroidal cavity with an elliptical ring (TCER).
- Employed the finite element method (FEM) for analyzing propagation characteristics.
- Evaluated the effects of refractive index and geometric parameters on sensing performance.
Main Results:
- Achieved a maximum sensitivity of 2220 nm/RIU with a figure of merit (FOM) of 58.7.
- Demonstrated high performance for the designed structure.
- Calculated a temperature detection sensitivity of 1.187 nm/℃.
Conclusions:
- The proposed Fano resonance-based sensor exhibits excellent sensitivity and a simple structure.
- The sensor is suitable for refractive index sensing and has potential in temperature detection applications.
Related Concept Videos
01:27Toroids
3.0K
A toroid is a closely wound donut-shaped coil constructed using a single conducting wire. In general, it is assumed that a toriod consists of multiple circular loops perpendicular to its axis.
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb...
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb...
3.0K
01:13Torque On A Current Loop In A Magnetic Field
4.6K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
4.6K