Photonic crystal supporting high frequency sensitivity self-collimation phenomenon and design method and use thereof

Patent metadata

Field	Value
Publication number	US-9684094-B2
Application number	US-201414761612-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	Nov 27, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A photonic crystal supporting highly frequency-sensitive self-collimation phenomenon, which is formed by at least two kinds of materials, and has a periodic distribution of refractive index, the photonic crystal has straight equi-frequency contours or flat equi-frequency surfaces in a certain band in the first Brillouin zone of wave-vector space, and the frequency-sensitivity of self-collimation is at least 50 times higher than the change rate of curvatures of the equi-frequency contours or the equi-frequency surfaces with frequencies in a vacuum.

First claim

What is claimed is:

1. A photonic crystal supporting highly frequency-sensitive self-collimation phenomenon having a periodic distribution of refractive index formed by at least two kinds of materials, wherein the photonic crystal has straight equi-frequency contours or flat equi-frequency surfaces in a certain band within a first Brillouin zone of wave-vector space of the photonic crystal, and a frequency-sensitivity of self-collimation is at least 50 times higher than a change rate of curvatures of the equi-frequency contours or the equi-frequency surfaces with frequencies in a vacuum.

2. The photonic crystal supporting highly frequency-sensitive self-collimation phenomenon according to claim 1 , characterized in that, the frequency-sensitivity of self-collimation is:

γ
=

(

1

c
⁢

/

⁢

ω
2

)

⁢

∂
κ

⁢

/

⁢

∂
ω

⁢

|

ω
=

ω
sc

,

k
1

=
0

=

(

1

c
⁢

/

⁢

ω
2

)

⁢

∂
3

⁢
ω

∂

k
2

⁢

∂

k
1
2

⁢

/

⁢

υ
g
2

⁢

|

ω
=

ω
sc

,

k
1

=
0

wherein, κ represents a curvature of the equi-frequency contour, ω represents a frequency of the equi-frequency contour, ω sc is a frequency of the self-collimation point, k 1 represents a component of wavevector being parallel with the straightequi-frequency contours, k 2 represents a component of wavevector being perpendicular with the straightequi-frequency contours, group velocity ν g =√{square root over ((∂ω/∂k 1 ) 2 +(∂ω/∂k 2 ) 2 )}, constant c is the velocity of light in vacuum, normalized base c/ω 2 represents an absolute value of change rate of curvature κ of the equi-frequency contours with frequency ω in vacuum.

3. The photonic crystal supporting highly frequency-sensitive self-collimation phenomenon according to claim 1 , characterized in that, the photonic crystal has van Hove singularities, by changing some structural or material parameters of the photonic crystals, the van Hove singularities can be moved close to the straight equi-frequency contours or the flat equi-frequency surfaces, and frequency-sensitivity of self-collimation γ is enhanced.

4. The photonic crystal supporting highly frequency-sensitive self-collimation phenomenon according to claim 1 , there exist one or more zero group velocity points, by changing some structural or material parameters of the photonic crystals, the one or more van Hove singularities may be moved away from the straight equi-frequency contours or the flat equi-frequency surfaces, and even moved out of the first Brillouin zone, the highly frequency-sensitive self-collimation phenomenon still exist.

5. The photonic crystal supporting highly frequency-sensitive self-collimation phenomenon according to claim 1 , characterized in that, the frequency sensitivity of self-collimation γ is sensitive to structure parameters and material parameters of the photonic crystal, so the photonic crystal can be used for sensitive detectors for these physical parameters.

Assignees

• Shanghai Inst Microsystem & Information Tech Cas
• Univ Fudan
• Shanghai Insitute Of Microsystem And Information Tech Chinese Acad Of Sciences

Inventors

• Jiang Xunya
• Lin Xulin
• Zhang Xiaogang
• Li Wei
• Chen Liang

Classifications

• G02B6/1225 Primary

  comprising photonic band-gap structures or photonic lattices · CPC title

• G02B1/005 Primary

  made of photonic crystals or photonic band gap materials (photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295) · CPC title

• G02F1/3511

  Self-focusing or self-trapping of light; Light-induced birefringence; Induced optical Kerr-effect · CPC title

• G02F2202/30

  Metamaterials · CPC title

• G02B27/0012

  Optical design, e.g. procedures, algorithms, optimisation routines · CPC title