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A graphene based tunable terahertz sensor with double Fano resonances
Yuping Zhang1, Tongtong Li, Beibei Zeng
1Qingdao Key Laboratory of Terahertz Technology, College of Electronic Communication and Physics, Shandong University of Science and Technology, Qingdao 266510, China.
Nanoscale
|July 8, 2015
Summary
This study introduces an ultrasensitive terahertz sensor using graphene and gold. The novel design achieves high sensitivity and tunable sensing ranges for advanced applications.
Area of Science:
- Optoelectronics
- Nanotechnology
- Sensor Technology
Background:
- Terahertz (THz) sensing requires high sensitivity and tunability.
- Existing THz sensors face limitations in performance and flexibility.
Purpose of the Study:
- To develop an ultrasensitive and tunable THz sensor.
- To investigate Fano resonances for enhanced sensing capabilities.
Main Methods:
- Utilizing full-wave electromagnetic simulations.
- Designing a unit cell with a subwavelength graphene disk and an annular gold ring.
- Analyzing Fano-type resonances for sensing.
Main Results:
- Achieved a frequency sensitivity of 1.9082 THz per refractive index unit (RIU).
- Obtained a figure of merit (FOM) of 6.5662.
- Demonstrated tunable sensing range by adjusting graphene's Fermi level.
Conclusions:
- The proposed graphene-gold sensor offers ultrasensitive THz detection.
- The design enables active tuning of the sensing range, enhancing its applicability.
- This technology holds promise for advanced sensing applications in various fields.
