Wave properties in asymmetric single-negative-base photonic crystals

Area of Science:

• Photonics
• Materials Science
• Wave Phenomena

Background:

• Photonic crystals offer unique wave manipulation capabilities.
• Asymmetric structures and defects introduce novel optical properties.
• Lossy materials are crucial for developing absorption-based devices.

Purpose of the Study:

• To theoretically investigate wave properties and absorption spectra of 1D defective asymmetric photonic crystals.
• To explore the unidirectional absorption characteristics in these engineered structures.
• To analyze the influence of material composition and layer stacking on absorption peaks.

Main Methods:

• Theoretical modeling of one-dimensional photonic crystal structures.
• Analysis of wave propagation and absorption spectra.
• Investigating structures with lossy epsilon-negative and mu-negative materials, and dielectric layers.

Main Results:

• Observed two types of unidirectional absorption peaks.
• One peak's frequency is tunable by defect layer thickness; the other is not.
• Asymmetric peak numbers for forward (M-1) and backward (N-1) propagation were identified.

Conclusions:

• Engineered photonic crystals exhibit controllable unidirectional absorption.
• The number and frequency of absorption peaks can be precisely tuned.
• These findings pave the way for novel optical devices with directional light absorption.