An optical diode and magnifier from a general function photonic crystals

TL;DR

This paper introduces a new class of general function photonic crystals with spatially varying refractive index, enabling optical diode and magnifier functionalities through tailored light transmission and amplification.

Contribution

It develops the theoretical framework for GFPCs with position-dependent refractive index and demonstrates their potential for optical diode and magnifier applications.

Findings

Refractive index functions can significantly alter transmissivity.

GFPCs can act as light magnifiers or attenuators.

They can be engineered to function as optical diodes.

Abstract

We have presented a new general function photonic crystals (GFPCs), which refractive index is a function of space position. Based on Fermat principle, we achieve the motion equations of light in one-dimensional general function photonic crystals, and calculate its transfer matrix. In this paper, we choose the line refractive index function for two mediums $A$ and $B$, and obtain new results: (1) when the line function of refractive indexes is up or down, the transmissivity can be far larger or smaller than 1. (2) when the refractive indexes function increase or decrease at the direction of incident light, the light intensity should be magnified or weaken, which can be made light magnifier or attenuator. (3) The GFPCs can also be made optical diode. The new general function photonic crystals can be applied to design more optical instruments.