Optical control device

• US 8,208,776 B2
• Filed: 01/10/2008
• Issued: 06/26/2012
• Est. Priority Date: 01/10/2007
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Tokushima, Masatoshi
• Primary Examiner(s): MASKELL, MICHAEL P
• Application Number:
  US12/522,809
• Publication Number:
  US 20100014821A1
• Time in Patent Office: 1,629 Days
• Field of Search: 385/38, 385/39, 385/50, 385129-132
• US Class Current: 385/130
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: G02B 6/1225 comprising photonic band-gap structures or photonic lattices
• CPC Class Codes: G02F 2201/06 integrated waveguide
• CPC Class Codes: G02F 2201/20 delay line
• CPC Class Codes: G02F 2202/32 Photonic crystals
• CPC Class Codes: G02F 2203/055 wavelength filtering

Abstract

There is provided an optical control device including a plurality of line-defect waveguides provided in a photonic crystal; each line-defect waveguide including a multiplicity of dielectric pillars with a finite height arranged at lattice points of a two-dimensional Bravais lattice. The optical control device comprises: a first line-defect waveguide; a second line-defect waveguide provided with the dielectric pillars having a thickness different from that of the dielectric pillars of the first line-defect waveguide; and a third line-defect waveguide arranged between the first and second line-defect waveguides and provided with the dielectric pillars whose thicknesses are gradually varied from those of the dielectric pillars of the first line-defect waveguide to those of the dielectric pillars of the second line-defect waveguide along a wave guiding direction.

Claims

1. An optical control device including a plurality of line-defect waveguides provided in a photonic crystal, each line-defect waveguide including a multiplicity of dielectric pillars with a finite height arranged at lattice points of a two-dimensional Bravais lattice, said optical control device comprising:

a first line-defect waveguide;

a second line-defect waveguide provided with the dielectric pillars having a thickness different from that of the dielectric pillars of said first line-defect waveguide; and

a third line-defect waveguide arranged between said first and second line-defect waveguides and provided with the dielectric pillars whose thicknesses are gradually varied from those of the dielectric pillars of said first line-defect waveguide to those of the dielectric pillars of said second line-defect waveguide along a wave guiding direction,

wherein thicknesses of the dielectric pillars contained in the line defect of said first and second line-defect waveguides differ only with respect to those of the dielectric pillars contained in the line defect(s) of said first and second line-defect waveguides, and the thicknesses of dielectric pillars not contained in the line defect(s) of said first and second line-defect waveguides are equal.

2. An optical control device including a plurality of line-defect waveguides provided in a photonic crystal, each line-defect waveguide including a multiplicity of dielectric pillars with a finite height arranged at lattice points of a two-dimensional Bravais lattice, said optical control device comprising:

a first line-defect waveguide;

a second line-defect waveguide provided with the dielectric pillars having a thickness different from that of the dielectric pillars of said first line-defect waveguide; and

a third line-defect waveguide arranged between said first and second line-defect waveguides and provided with the dielectric pillars whose thicknesses are gradually varied from those of the dielectric pillars of said first line-defect waveguide to those of the dielectric pillars of said second line-defect waveguide along a wave guiding direction,

wherein thicknesses of the dielectric pillars not contained in a line defect of said first and second line-defect waveguides differ only with respect to those of the dielectric pillars not contained in line defect(s) of said first and second line-defect waveguides, and wherein the thicknesses of the dielectric pillars contained in the line defect(s) of said first and second line-defect waveguides are equal.

3. An optical control device including a plurality of line-defect waveguides provided in a photonic crystal, each line-defect waveguide including a multiplicity of dielectric pillars with a finite height arranged at lattice points of a two-dimensional Bravais lattice, said optical control device comprising:

a first line-defect waveguide;

a second line-defect waveguide provided with the dielectric pillars having a thickness different from that of the dielectric pillars of said first line-defect waveguide; and

a third line-defect waveguide arranged between said first and second line-defect waveguides and provided with the dielectric pillars whose thicknesses are gradually varied from those of the dielectric pillars of said first line-defect waveguide to those of the dielectric pillars of said second line-defect waveguide along a wave guiding direction,

wherein the thicknesses of the dielectric pillars contained in the line defects of said first and second line-defect waveguides change in thickness in opposite directions between the dielectric pillars not contained in the line defect of the first and second line-defect waveguides and the dielectric pillars contained in the line defect of the first and second line-defect waveguides.