Optical control of THz reflectivity with surface waves

Vassant, Simon; Pardo, Fabrice; Bouchon, Patrick; Marquier, François; Pélouard, Jean-Luc

doi:10.1117/12.895531

Cited by 1 publication

(1 citation statement)

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“…The dielectric constants of GaAs and Al x Ga 1-x As are important parameters for designing and analyzing the terahertz band devices, and free carrier absorption plays a significant role in the terahertz optical properties of Al x Ga 1-x As film materials [34]. The free carrier optical properties of GaAs and the dielectric constant response function of thin film samples can be reasonably described using the Drude model [35] and the Lorenz-Drude model [36]. The optical properties of p-type Al x Ga 1-x As epitaxial film with beryllium and carbon doping concentrations of 10 18 -10 19 cm −3 have been investigated by far-infrared reflectance spectroscopy in the frequency range of 1.5-15 THz [37].…”

Section: Dielectric Constant Analysis Of Gaas and Alxga1-xasmentioning

confidence: 99%

Improvement of Optical Confinement for Terahertz Vertical-Cavity Surface-Emitting Laser with Square-Lattice Photonic Crystal Structure

et al. 2023

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A new method proposed to enhance the optical confinement of the terahertz band in a vertical cavity surface emitting laser involves introducing a square-lattice photonic crystal structure. This structure’s filling factor was optimized by computing the energy band structure and optical band values of the photonic crystal. The optimal optical band value is 0.436–0.528 a/λ. At a specific carrier concentration, the real part of dielectric constant of GaAs/AlGaAs materials will gradually increase with the increase of Al elements. By adjusting the length of the resonant cavity, a vertical cavity surface emitting laser with two wavelengths can be created without utilizing current injection. Additionally, the photonic crystal structure’s control effect on the transverse mode of the vertical cavity surface emitting laser and the release effect of the PN junction light confinement were analyzed. Numerical calculations indicated that incorporating a cubic photonic crystal structure in the vertical cavity surface emitting laser resulted in a 2× increase in the difference frequency intensity and a 6.33× increase in the optical field intensity.

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