Tamm Cavity in the Terahertz Spectral Range

Abstract

Electromagnetic resonators, which are based on optical cavities or electronic circuits, are key elements to enhance and control light-matter interaction. In the THz range, current optical cavities exhibit very high-quality factors with $(\lambda /2{)}^3$ mode volumes limited by diffraction, whereas resonant electronic circuits show low quality factor but provide strong subwavelength effective volume ($10^{-6}{\lambda }^3$). To overcome the limitations of each type of resonator, great efforts are being devoted to improving the performances of current methods or to the emergence of original approaches. Here, we report on an optical resonator based on Tamm modes newly applied to the THz range, comprising a metallic layer on a distributed Bragg reflector and demonstrating a high-quality factor of 230 at $\sim$1 THz. We further experimentally and theoretically show a fine-tuning of the Tamm mode frequency (over a 250 GHz range) and polarization sensitivity by subwavelength structuration of the metallic layer. Electromagnetic simulations also reveal that THz Tamm modes are confined over a $\lambda$/2 length within the distributed Bragg reflector and can be ideally coupled to both bulk materials and 2D materials. These THz Tamm cavities are therefore attractive as basic building blocks of lasers, for the development of advanced THz optoelectronic devices such as sensitive detectors, high-contrast modulators, narrow filters, and polarizers, as well as for THz cavity quantum electrodynamics in nanostructures.

arXiv comment8 pages, 4 figures

References in corpus (10)

• Simple and accurate analytical model of planar grids and high-impedance surfaces comprising metal strips or patches
• Ultrastrong coupling of the cyclotron transition of a two-dimensional electron gas to a THz metamaterial
• Collective, Coherent, and Ultrastrong Coupling of 2D Electrons with Terahertz Cavity Photons
• Critical coupling to Tamm plasmons
• Terahertz gas phase spectroscopy using a high finesse Fabry-Pérot cavity
• Ultra-Strong Light-Matter Coupling in Deeply Subwavelength THz LC resonators
• Graphene as Gain Medium for Broadband Lasers
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Cited by in corpus (6)

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• Quantum interference between fundamentally different processes is enabled by shaped input wavefunctions
• Topological magnon-photon interaction for cavity magnonics
• Theory of fractional quantum Hall liquids coupled to quantum light and emergent graviton-polaritons
• Terahertz chiral photonic-crystal cavities for Dirac gap engineering in graphene