Patent ID: 11892438
Assignee: ASAHI KASEI MICRODEVICES CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. The optical densitometer according to claim 15, wherein
the distance L2 at which the light propagation portion and the substrate are separated from each other is equal to or greater than a distance given by the following Expression (5):, 6
          ⁢
          
            λ
            0
          
        
        
          2
          ⁢
          π
          ⁢
          
            
              
                n
                pro
                2
              
              -
              
                n
                
                  L
                  ⁢
                  
                    
                  
                  ⁢
                  2
                
                2
              
            
          
        
      
    
    
      
        Expression
        ⁢
        
          
        
        ⁢
        
          (
          5
          )
        
      
    
  

where λ0 represents the average wavelength, in vacuum, of the light propagating through the core layer, npro represents the refractive index of the material forming the light propagation portion, and nL2 represents a refractive index of a material present in a portion sandwiched between the light propagation portion and the substrate.