Thermally tunable and omnidirectional terahertz photonic bandgap in the one-dimensional photonic crystals containing semiconductor InSb

Complex Photonic Band Structures in a Photonic Crystal Containing Lossy Semiconductor Insb

“…The second gap with a lower band edge around 4 THz is the so-called Bragg gap, which is consistent with the result of Figure 3 in Ref. [28]. It is also worthy to mention that the band edge and the gap width in the second gap cannot be estimated by usual formulas in the theory of Bragg reflector because InSb is strongly dispersive medium.…”

“…The calculated CPBSs here are in sharp contrast with those in Ref. [28], where there is no K i and nonbending in K r in the first band gap because the damping frequency γ = 0 has been taken.…”

“…Recently, the photonic band structure (PBS) at terahertz (THz) for a semiconductor-dielectric photonic crystal (SDPC) containing intrinsic InSb has been investigated by Dai et al [28]. However, the authors assume there is no loss in intrinsic InSb.…”

“…(1) to investigate the electromagnetic properies for the InSb-based photonic crystal. In a recent paper [28], the authors simply assume γ = 0 in calculating the THz PBS of InSb-SiO 2 SDPC. This assumption obviously is too simple to be correct at THz because the damping frequency is also a strong function of temperature [29].…”

Mach–Zehnder Interferometer-Based Integrated Terahertz Temperature Sensor

“…= √ 2 ( 0 ⁄ ). The carrier density N depends strongly on the temperature T, which makes the plasma frequency tunable by changing the temperature T. In the following calculations, the adopted parameters of the Drude model for InSb are set as ∞ = 15.68, = 0.015 (where is the mass of electron) and = 0.1 THz [34]. Figure 2 (a) shows the real part of the permittivity of InSb (Re(InSb)) as functions of the operating temperature (T) and frequency of incident wave (f).…”