Method for incidence of light into a photonic crystal optical waveguide

Abstract

Disclosed in a method and a device in which a wave number of light in the waveguide mode of a photonic crystal optical waveguide is matched with that of the incident light, or a intensity ratio of electric field to magnetic field of the light in the waveguide mode of the photonic crystal optical waveguide is matched with that of the incident light, and furthermore, in addition to the method above, the distribution of light intensity on the incident end surface in the waveguide mode of the photonic crystal optical waveguide is matched with that of the incident light. A photonic crystal optical waveguide and channel optical waveguide are joined together, and the structure of the channel optical waveguide is wedge shaped in the joint section.

1 . A method for controlling incidence of light into a photonic crystal optical waveguide, wherein incident light travels into an optical waveguide from an outside thereof, said optical waveguide being capable of guiding the light and formed in an photonic crystal including two or more types of materials having different indexes of refraction arranged periodically in any one of one dimension, two dimensions and three dimensions, said method comprising:
 matching a wave number of light in the optical waveguide formed in the photonic crystal with a wave number of the incident light outside of the photonic crystal, thereby attaining high efficiency of the incidence of light into said optical waveguide.   
     
     
         2 . A method for controlling incidence of light into a photonic crystal optical waveguide, wherein incident light travels into an optical waveguide from an outside thereof, said optical waveguide being capable of guiding the light and formed in an photonic crystal including two or more types of materials having different indexes of refraction arranged periodically in any one of one dimension, two dimensions and three dimensions, said method comprising:
 matching a wave number vector of light in the optical waveguide formed in said photonic crystal with a wave number vector of the incident light on the outside of said photonic crystal, thereby attaining high efficiency of the incidence of light into said optical waveguide.   
     
     
         3 . A method for controlling incidence of light into a photonic crystal optical waveguide, wherein incident light travels into an optical waveguide from an outside thereof, said optical waveguide being capable of guiding the light and formed in an photonic crystal including two or more types of materials having different indexes of refraction arranged periodically in any one of one dimension, two dimensions and three dimensions, said method comprising:
 matching an intensity ratio of electric field to magnetic field of light in the optical waveguide formed in said photonic crystal with an intensity ratio of electric field to magnetic field of the incident light on the outside of said photonic crystal, thereby attaining high efficiency of the incidence of light into said optical waveguide.   
     
     
         4 . The method according to  claim 3 , comprising further the step of
 matching the intensity ratio of electric field to magnetic field of incident light on an incidence end plane of the optical waveguide formed in said photonic crystal with the intensity ratio of electric field to magnetic field of incident light on the outside of said photonic crystal.   
     
     
         5 . The method according to  claim 3 , comprising further the step of
 matching the intensity ratio of electric field to magnetic field of incident light outside of said photonic crystal by making the value of the intensity ratio of electric field to a magnetic field of incident light on the incidence end plane of the optical waveguide formed in said photonic crystal less than 1, said value of the intensity ratio being normalized by the intensity ratio of electric field to magnetic field in a vacuum.   
     
     
         6 . The method according to  claim 3 , comprising the step of
 matching the intensity ratio of electric field to magnetic field of incident light outside of said photonic crystal by using from a first band to near a second band of a plurality of photonic bands on the dispersion curve of said photonic crystal.   
     
     
         7 . The method according to  claim 3 , comprising the step of
 matching the shape of distribution of the intensity ratio of electric field to magnetic field of incident light on the end surface of the optical waveguide formed in said photonic crystal with the shape of distribution of the intensity ratio of electric field to magnetic field of incident light outside of said photonic crystal.   
     
     
         8 . The method according to  claim 1 , comprising the step of
 matching light-intensity distribution in the waveguide mode of incident light on the incident plane of the optical waveguide formed in said photonic crystal with light-intensity distribution of incident light outside of said photonic crystal.