Gate-tunable coherent perfect absorption of terahertz radiation in graphene

Abstract

Perfect absorption of radiation in a graphene sheet may play a pivotal role in the realization of technologically relevant optoelectronic devices. In particular, perfect absorption of radiation in the terahertz (THz) spectral range would tremendously boost the utility of graphene in this difficult range of photon energies, which still lacks cheap and robust devices operating at room temperature. In this work we show that unpatterned graphene flakes deposited on appropriate substrates can display gate-tunable coherent perfect absorption (CPA) in the THz spectral range. We present theoretical estimates for the CPA operating frequency as a function of doping, which take into account the presence of common sources of disorder in graphene samples.

To appear in 2D Materials

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Cited by in corpus (13)

• Coherent perfect absorbers: linear control of light with light
• Tunable terahertz coherent perfect absorption in a monolayer graphene
• Graphene Based Terahertz Phase Modulators
• Observation of gate-tunable coherent perfect absorption of terahertz radiation in graphene
• Directional excitation of graphene surface plasmons
• Electrically tuneable nonequilibrium optical response of graphene
• Quantum Coherent Absorption of Squeezed Light
• $\mathcal{P}\mathcal{T}$-Symmetric Coherent Perfect Absorber with Graphene
• Broadband Coherent Perfect Absorber with PT-Symmetric 2D-Materials
• THz conductivity of graphene on boron nitride
• Broadband and Wide-Angle Invisibility with PT-Symmetric 2D-Weyl Semimetal
• Scattering Dynamics and Boundary States of a Non-Hermitian Dirac Equation
• Coherent Plasmonic Absorption in the Femtosecond Regime