Two-dimensional square-lattice photonic crystal based on cross rods and rotated hollow square rods

Patent metadata

Field	Value
Publication number	US-10509144-B2
Application number	US-201715822240-A
Country	US
Kind code	B2
Filing date	Nov 27, 2017
Priority date	May 27, 2015
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

The present invention discloses a 2D square-lattice PhC based on cross rods and rotated hollow square rods, comprising a high-refractive-index dielectric rod, a cross plate dielectric rod and a low-refractive-index background dielectric rod; the unit cell of the square-lattice PhC includes a high-refractive-index rotated hollow square rod, a cross plate dielectric rod and a background dielectric; the hollow square rod has an outer contour which is a first rotated square rod with the rotated angle α of 45° to 65° and the side length b of 0.6 a to 0.75 a, and a hollow part with a cross section being a second rotated square rod with the rotated angle β of 25° to 50° and the side length c of 0.33 a to 0.5 a; the first rotated square rod is connected with the cross plate dielectric rod, plate dielectric rods of which in the horizontal and vertical directions have different widths.

First claim

We claim:

1. A 2D square-lattice PhC based on cross rods and rotated hollow square rods, comprising:
a high-refractive-index dielectric rod, a cross plate dielectric rod and a low-refractive-index background dielectric rod; said PhC structure is formed by unit cells arranged according to square-lattices; the lattice constant of said square-lattice PhC is a; the unit cell of said square-lattice PhC includes a high-refractive-index rotated hollow square rod, a cross plate dielectric rod and a background dielectric; the outer contour of said hollow square rod is a first rotated square rod with the rotated angle α of 45° to 65° and a side length b of 0.6 a to 0.75 a; the cross section of the hollow part of said hollow square rod is a second rotated square rod with the rotated angle β of 25° to 50° and the side length c of 0.33 a to 0.5 a; said first rotated square rod is connected with said cross plate dielectric rod; said cross plate dielectric rod is located in the middle of the square edge of the square-lattice; plate dielectric rods of said cross plate dielectric rod in the horizontal and vertical directions have different widths; the width d of said plate dielectric rod in the horizontal direction is 0.01 a to 0.03 a; and the width e of said plate dielectric rod in the vertical direction is 0.01 a to 0.03 a.

2. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein the high-refractive-index dielectric is the one with the refractive index of greater than 2.

3. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 2 , wherein the high-refractive-index dielectric is silicon, and the low-refractive-index dielectric is air; the rotated angle α of the first rotated square rod is greater than 45° and less than 65°, and its side length b is greater than 0.6 a and less than 0.75 a; the rotated angle β of the second rotated square rod is greater than 25° and less than 50°, and its side length c is greater than 0.33 a and less than 0.5 a; the width d of the plate dielectric rod in the horizontal direction is greater than 0.01 a and less than 0.03 a; the width e of the plate dielectric rod in the vertical direction is greater than 0.01 a and less than 0.03 a; and the absolute PBG relative value of the PhC structure is greater than 10%.

4. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 2 , wherein the high-refractive-index dielectric is silicon, and the low-refractive-index dielectric is air; the rotated angle α of the first rotated square rod is 60.04°, and its side length b is 0.6927 a; the rotated angle β of the second rotated square rod is 27.348°, and its side length c is 0.45344 a; the width d of the plate dielectric rod in the horizontal direction is 0.0216 a; the width e of the plate dielectric rod in the vertical direction is 0.0256 a; and the absolute PBG relative value of the PhC structure is 19.51%.

5. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein said high-refractive-index dielectric is silicon, gallium arsenide or titanium dioxide.

6. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein the high-refractive-index dielectric is silicon, with the refractive index of 3.4.

7. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein said background dielectric is the low-refractive-index dielectric.

8. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 7 , wherein the high-refractive-index dielectric is silicon, and the low-refractive-index dielectric is air; the rotated angle α of the first rotated square rod is greater than 45° and less than 65°, and its side length b is greater than 0.6 a and less than 0.75 a; the rotated angle β of the second rotated square rod is greater than 25° and less than 50°, and its side length c is greater than 0.33 a and less than 0.5 a; the width d of the plate dielectric rod in the horizontal direction is greater than 0.01 a and less than 0.03 a; the width e of the plate dielectric rod in the vertical direction is greater than 0.01 a and less than 0.03 a; and the absolute PBG relative value of the PhC structure is greater than 10%.

9. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 7 , wherein the low-refractive-index dielectric is air; the rotated angle α of the first rotated square rod is 60.04°, and its side length b is 0.6927 a; the rotated angle β of the second rotated square rod is 27.348°, and its side length c is 0.45344 a; the width d of the plate dielectric rod in the horizontal direction is 0.0216 a; the width e of the plate dielectric rod in the vertical direction is 0.0256 a; and the absolute PBG relative value of the PhC structure is 19.51%.

10. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein the low-refractive-index background dielectric is a dielectric with the refractive index of less than 1.6.

11. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein said low-refractive-index background dielectric is air, vacuum, magnesium fluoride or silicon dioxide.

12. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein said high-refractive-index dielectric is silicon, and said low-refractive-index dielectric is air; the rotated angle α of the first rotated square rod is greater than 45° and less than 65°, and its side length b is greater than 0.6 a and less than 0.75 a; the rotated angle β of the second rotated square rod is greater than 25° and less than 50°, and its side length c is greater than 0.33 a and less than 0.5 a; the width d of the plate dielectric rod in the horizontal direction is greater than 0.01 a and less than 0.03 a; the width e of the plate dielectric rod in the vertical direction is greater than 0.01 a and less than 0.03 a; and the absolute PBG relative value of the PhC structure is greater than 10%.

13. The 2D square-lattice PhC based on cross rods and rotated hollow square rods of claim 1 , wherein the high-refractive-index dielectric is silicon, and the low-refractive-index dielectric is air; the rotated angle α of the first rotated square rod is 60.04°, and its side length b is 0.6927 a; the rotated angle β of the second rotated square rod is 27.348°, and its side length c is 0.45344 a; the width d of the plate dielectric rod in the horizontal direction is 0.0216 a; the width e of the plate dielectric rod in the vertical direction is 0.0256 a; and the absolute PBG relative value of the PhC structure is 19.51%.

Assignees

• Ouyang Zhengbiao
• Univ Shenzhen

Inventors

• Ouyang Zhengbiao
• Chen Zhiliang

Classifications

• 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

• G02B6/1225 Primary

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

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title