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Narrow nanometer-thin optical filters based on double Fano resonance in metallic films

Realize a spatially varying, nanometer-thick optical filter, with high spectral resolution (a few nanometer) at an arbitrary spectral band. 
 
Such filters could be integrated with light array detectors (CCD) to realize truly, high-performance, miniature spectrometers.
 
Scientific background of the technology 
Category: Nano-photonics, meta-surfaces  - sub wavelength variations of materials for desired optical response.   
Main idea: generalization of the universal phenomenon of Fano resonance, leading to asymmetric spectral line shapes.  Using a simple geometry to realize a double-Fano resonance having very narrow spectral line shapes.

 

Our filters could be integrated with array photo-detectors (CCD) to realize high-performance miniature spectrometers. 

Optical Spectrometer Market is growing rapidly, the technology allows identification of materials, chemical compounds, pollution, etc. 
 

Features of the solution

  • The use of a double Fano resonance can lead to very sharp spectral transmission\reflection profile with a grating structure – leading to high resolution filters. 
  • Extremely thin footprint. 
  • Tailored spatially varying response  
  • Applicable to a very wide spectral range (from UV to mid IR, depending on substrate being used) 
  • Can easily be integrated with\fabricated on a CCD device.


The main advantages:

  • No contact with the material. Reducing cost, preventing infections. 
  • Spectral solutions obtain instant accurate measurements. 
  • Saves manpower, time and money.  
  • Reduced size, allowing integration within a smartphone.  

Applications: 

  • Medical: Measuring of higher variety of chemical parameters.  
  • Manufactures: Used to detect chemical composition of products. 
  • Controlled agriculture: Plant status, level, pH, water, fertilizers, chemical substances and types of spray.

 

IP
International patent application was filed, July 2017. PCT/IL2017/050834