A cylindrical optical black hole using graded index photonic crystals

Abstract

The electromagnetic wave propagation of a two-dimensional optical black hole with graded index photonic crystals for transverse magnetic modes is studied. The implementation of the proposed system is validated in the metamaterial regime. The finite element method is employed in order to confirm the optical properties of the designed device. Numerical simulations show that the light incident on the device is bent toward the central area and absorbed by the inner core. As a result, the artificial optical black hole can effectively absorb the incident waves from all directions. The structure is composed of two kinds of real isotropic materials, which eases the experimental fabrication.

Sunflower photonic quasicrystals

“…Inspired by nature, optical properties of spiral structures have been explored in many aspects, for instances, photonic crystal fibers (PCF) [1], nanoplasmonic spirals [2] etc.. Recently, Gradient index structures [3] have received increased attention in the recent literature from invisibility cloak [4,5] and optical black hole [6], to planar devices such as Luneberg lens [7,8]. Generally, GRIN materials required continuous graded index profile.…”

Luneburg and flat lens based on graded photonic crystal

“…As we all know, the broad range of photonic crystal (PC) applications enables the design of various cavities, waveguides, switches, mirrors and filters [3]. While they were also shown that the potential applications ranges from invisibility cloaks [4,5] and optical black holes [6], to planar devices such as Luneburg [7,8]. The graded photonic crystals (GPCs) consist of unit cells with spatially varying geometrical or material properties [9].…”

Wavelength-Selective Solar Thermal Absorber With Two-Dimensional Nickel Gratings

“…Various stmctures were proposed as an absorber, including tubes [6], v-grooves [7], roughened surfaces [8], a moth-eye film on silicon [9], onedimensional (ID) grating on a film [10], two-dimensional (2D) grating on a film [11], corrugated surfaces [12], core-shell [13], 2D cylindrical [14] and square [15] photonic crystals, and multilayers [16]. The power throughput and energy conversion efficiency can be both low if the irradiation is reflected or re-emitted from the absorber surface.…”