Extremely terahertz electric-field enhancement in a high-Q photonic crystal slab cavity with nanoholes

Abstract

A one-dimensional photonic-crystal (PC) cavity with nanoholes is proposed for extremely enhancing the THz electric fields by utilizing the electromagnetic (EM) boundary conditions, where both slot effect (for the perpendicular component of the electric displacement field) and anti-slot effect (for the parallel component of the electric field) contribute to the considerable field enhancement. The EM energy density can be enhanced in the high refractive index material by a factor of (εh/εl)^2, where εh and εl are the permittivities of the high and low refractive index materials, respectively. Correspondingly, the mode volume can be enhanced by a factor of 288 as compared with the regular THz PC cavity and is three orders of magnitude smaller than the diffraction limitation. While the proposed THz cavity design also supports the modes with high Q > 10^4, which lead to strong Purcell enhancement of spontaneous emission by a factor exceeds 10^6. Our THz cavity design is feasible and appealing for experimental demonstrations, since the semiconductor layer where the EM is maximized can naturally be filled with a quantum engineered active materials, which is potential for developing the room-temperature coherent THz radiation sources.

References in corpus (8)

• Deterministic design of wavelength scale, ultra-high Q photonic crystal nanobeam cavities
• Photonic Crystal Nanobeam Cavity Strongly Coupled to the Feeding Waveguide
• Optical properties of metal-dielectric-metal microcavities in the THz frequency range
• Cavity-funneled generation of indistinguishable single photons from strongly dissipative quantum emitters
• Ultra-high Q terahertz whispering-gallery modes in a silicon resonator
• Detection of deep-subwavelength dielectric layers at terahertz frequencies using semiconductor plasmonic resonators
• Dielectric Bow-tie Nanocavity
• Extremely local electric field enhancement and light confinement in dielectric waveguide

Cited by in corpus (3)

• Tamm Cavity in the Terahertz Spectral Range
• Quantum interference between fundamentally different processes is enabled by shaped input wavefunctions
• Beyond the Rabi model: light interactions with polar atomic systems in a cavity