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Giant dual-mode graphene-based terahertz modulator enabled by Fabry-Perot assisted multiple reflection.
Optics Letters
|April 2, 2019
Summary
We developed a high-performance terahertz (THz) modulator with dual operation modes. This device achieves high modulation depth (MD) over a broad frequency range for pulse operation and utilizes Fabry-Perot interference for coherent operation.
Area of Science:
- Optics and Photonics
- Terahertz Science and Technology
Background:
- Terahertz (THz) modulators are crucial components in THz systems.
- Developing modulators with high modulation depth and broadband operation remains a challenge.
Purpose of the Study:
- To report a novel high-performance terahertz (THz) modulator.
- To demonstrate its dual operation modes: pulse and coherent.
Main Methods:
- Experimental realization of a THz modulator.
- Characterization of modulation depth (MD) in pulse operation mode.
- Incorporation of Fabry-Perot (F-P) interference for coherent operation mode.
Main Results:
- Achieved MD > 90% for fifth-order pulse THz echo at 0.8 THz.
- Maintained MD > 75% over a broadband range > 1 THz in pulse mode.
- Realized MD > 75% at 0.76 THz in coherent operation mode using F-P interference.
Conclusions:
- The proposed THz modulator offers high performance in both pulse and coherent operation modes.
- The dual-mode functionality enhances its versatility for various THz applications.
- The device demonstrates significant potential for advanced THz communication and sensing systems.
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