Graphene Based Terahertz Phase Modulators
arXiv:1804.08279 · doi:10.1088/2053-1583/aabfaa
Abstract
Electrical control of amplitude and phase of terahertz radiation (THz) is the key technological challenge for high resolution and noninvasive THz imaging. The lack of an active materials and devices hinders the realization of these imaging systems. Here, we demonstrate an efficient terahertz phase and amplitude modulation using electrically tunable graphene devices. Our device structure consists of electrolyte-gated graphene placed at quarter wavelength distance from a reflecting metallic surface. In this geometry, graphene operates as a tunable impedance surface which yields electrically controlled reflection phase. Terahertz time domain reflection spectroscopy reveals the voltage controlled phase modulation of π and the reflection modulation of 50 dB. To show the promises of our approach, we demonstrate a multipixel phase modulator array which operates as a gradient impedance surface.
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Cited by in corpus (9)
- Non-Hermitian engineering of terahertz light using exceptional points in electrically tuneable collective light-matter interactions
- Graphene Terahertz Devices for Sensing and Communication
- Video-speed Graphene Modulator Arrays for Terahertz Imaging Applications
- Very-Large-Scale Reconfigurable Intelligent Surfaces for Dynamic Control of Terahertz and Millimetre Waves
- Tailored nano-electronics and photonics with two-dimensional materials at terahertz frequencies
- Engineering THz-frequency light generation, detection and manipulation through graphene
- On-chip terahertz modulation and emission with integrated graphene junctions
- Structurally Tunable Nonlinear Terahertz Metamaterials using Broadside Coupled Split Ring Resonators
- Tunable Graphene-based Pulse Compressor for Terahertz Application