Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An optical diode and magnifier from a general function photonic crystals   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.

1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys