A Controllable Plasmonic Resonance in a SiC-Loaded Single-Polarization Single-Mode Photonic Crystal Fiber Enables Its Application as a Compact LWIR Environmental Sensor

Surface waves in a linearly graded-index and an intensity-dependent index layered structure

A new type surface wave is found that propagates in a linearly graded-index and an intensity-dependent index layered structure characterized by an abrupt change in the dielectric constant. The main surface wave characteristics are calculated analytically. The optical domain, the thickness of which increases with an increasing effective refractive index and decreases with an increasing characteristic distance, is formed. It is discovered that the characteristic distance of the graded-index medium and effective refractive index can control wave energy redistribution between the semiconductor layers.

Epsilon negative-based, broadband single-polarization single-mode hollow core anti-resonant photonic crystal fiber

A broadband single-polarization single-mode (SPSM) hollow core anti-resonant photonic crystal fiber (HC-ARPCF) is proposed and analyzed by the finite element method in this paper. The HC-ARPCF design consisted of outer semicircular cladding tubes and inner circular cladding tubes. The SPSM behavior is achieved through controlling the effective material absorption loss (EML) by loading epsilon negative (ENG) material in the selected semicircular cladding tubes. Optimization of the configuration parameters is conducted to yield a large loss difference (LD) between one of the two orthogonally polarized fundamental modes and all the other unwanted modes. Therefore, only one desired mode will exist after a proper propagation distance, i.e., SPSM guidance. Specially, the optimal design provides a 288 nm (from 1408 nm to 1676 nm and from 1680 nm to 1700 nm) bandwidth in terms of 40 dB/m minimum LD (MLD) and 168 nm (from 1452 nm to 1620 nm) bandwidth in terms of 100 dB/m MLD. Furthermore, this fiber also exhibits a large effective mode area and near-zero dispersion properties over the entire operation bandwidth. The proposed HC-ARPCF may find its applications in polarization maintaining and high-power laser systems.