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