Abstract
We numerically demonstrated single-port coherent perfect loss (CPL) with a Fabry–Perot resonator in a photonic crystal (PC) nanobeam by using a perfect magnetic conductor (PMC)-like boundary. The CPL mode with even symmetry can be reduced to a single-port CPL when a PMC boundary is applied. The boundary which acts like a PMC boundary, here known as a PMC-like boundary, and can be realized by adjusting the phase shift of the reflection from the PC when the wavelength of the light is within the photonic bandgap wavelength range. We designed and optimized simple Fabry–Perot resonator and coupler in nanobeam to get the PMC-like boundary. To satisfy the loss condition in CPL, we controlled the coupling loss in the resonator by modifying the lattice constant of the PC used for coupling. By optimizing the coupling loss, we achieved zero reflection (CPL) in a single port with a PMC-like boundary.
Highlights
Absorption of light is an important property for control of traveling of light and removing the desired information from light
We numerically demonstrate coherent perfect loss (CPL) based on coherent perfect absorption (CPA)
To determine the perfect magnetic conductor (PMC)-like boundary, we compared the electric field distribution at the resonance wavelength between the photonic crystal (PC) serving as the PMC-like boundary and the PMC boundary
Summary
Absorption of light is an important property for control of traveling of light and removing the desired information from light. To achieve single-port (one incident wave) CPA, we must use a boundary such as perfect electric conductor (PEC) or perfect magnetic conductor (PMC) to maintain symmetry. A simple example of a PC is the Bragg reflector, which is a one-dimensional PC that can perfectly reflect incident light [20,21,22] Owing to their outstanding reflection properties, PCs have been used in various optical devices such as resonators, waveguides, filters, absorbers, and polarization selectors [23,24,25,26,27,28]. We numerically demonstrate coherent perfect loss (CPL) based on CPA with a single port with a PMC-like boundary using a PC. After matching the CPL condition, we observed perfect loss in the resonator with a PMC-like boundary
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