Abstract
We propose a novel type of spectral diffractive lenses that operate in the ±1-st diffraction orders. Such spectral lenses generate a sharp image of the wavelengths of interest in the +1-st and -1-st diffraction orders. The spectral lenses are convenient to use for obtaining remotely sensed vegetation index images instead of full-fledged hyperspectral images. We discuss the design and fabrication of spectral diffractive lenses for measuring vegetation indices, which include a Modified Red Edge Simple Ratio Index and a Water Band Index. We report synthesizing diffractive lenses with a microrelief thickness of 4 µm using the direct laser writing in a photoresist. The use of the fabricated spectral lenses in a prototype scheme of an imaging sensor for index measurements is discussed. Distributions of the aforesaid spectral indices are obtained by the linear scanning of vegetation specimens. Using a linear scanning of vegetation samples, distributions of the above-said water band index were experimentally measured.
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Claims 3
Claim · model-written summary
Spectral lenses generated sharp images at the selected wavelengths.
Not reportedTaxon
Verbatim
e0“Such spectral lenses generate a sharp image of the wavelengths of interest in the +1-st and -1-st diffraction orders”
Claim · model-written summary
Fabricated lenses had 4 µm microrelief thickness.
Not reportedTaxon
Verbatim
e0“diffractive lenses with a microrelief thickness of 4 µm using the direct laser writing in a photoresist”
Claim · model-written summary
Linear scanning measured water band index distributions on vegetation samples.
- Taxon
- vegetation samplese0
- Outcome
- distributions of the above-said water band indexe0
- Comparator
- linear scanninge0
Not reportedValue
Verbatim
e0“Using a linear scanning of vegetation samples, distributions of the above-said water band index were experimentally measured”