Volume-Confined Hyperbolic Polaritons and Surface-Confined Hyperbolic Polaritons in Ultrathin Hyperbolic Sheets and Their Identification

Abstract

Recent numerical and experimental works have shown that both volume-confined hyperbolic polaritons (v-HPs) and surfaceconfined hyperbolic polaritons (s-HPs) can be excited in hyperbolic materials. However, the study of v-HPs and s-HPs in ultrathin hyperbolic sheets remains elusive. In this work, we show that the traditional methods, such as dispersion relation and distribution of electric field, are not able to identify the different types of HPs in ultrathin hyperbolic sheets. In consideration of the dispersion relation and distribution of electric field, this work indicates that v-HPs and s-HPs can be treated as the same HPs in ultrathin hyperbolic sheets. The electromagnetic waves in the hyperbolic materials are propagating waves and evanescent waves for v-HPs and s-HPs, respectively. Thus, the types of electromagnetic waves in hyperbolic sheets are the only method to identify the types of HPs. We believe that this work will deepen our understanding of the v-HPs and s-HPs, especially in ultrathin hyperbolic sheets.

Actively tuning anisotropic light–matter interaction in biaxial hyperbolic material α-MoO3 using phase change material VO2 and graphene

“…The dispersion relations of the above-mentioned heterostructures are calculated by an intensity of the imaginary part of the Fresnel reflection coefficient Im(r pp ), [15,16] where r pp is the Fresnel reflection coefficient for p-polarized wave, which is calculated using the 4 × 4 matrix [38][39][40] R = r ss r sp r ps r pp . Meanwhile, the whole results are calculated by using the MATLAB.…”

Optical axis-driven modulation of near-field radiative heat transfer between two calcite parallel structures

“…28 The matrix D is obtained by . According to the theoretical investigation of HPs in a hyperbolic material (hBN), the dispersion relation of v-HPs and s-HPs in a thin sheet of hyperbolic material can be derived as 42,43 where , where k x and k y are the wavevector in the x - and y -axis, respectively. When the OA of CaCO 3 is along the x -axis, the regions in the k x – ky plane where v-HPs can occur are bounded respectively by the curves defined as 30 …”

“…À Á À1 . According to the theoretical investigation of HPs in a hyperbolic material (hBN), the dispersion relation of v-HPs and s-HPs in a thin sheet of hyperbolic material can be derived as 42,43 b…”

Epsilon-near-zero characteristics of near-field radiative heat transfer between α-MoO3 slabs

“…In addition, the angular frequency region within a negative real component of the permittivity (Re[e] o 0) is one of the regions being focused on due to the excitation of polaritons in this region. [16][17][18][19][20][21] It has been confirmed that the NFRHT can promote the application in thermal rectifications, 22 thermal transistors, 23 thermal modulators, 24,25 and near-field thermophotovoltaics. [26][27][28][29][30] Therefore, it is of great significance to investigate the NFRHT.…”