Ultra-Thin Spectrometer – New Lens Design

A research team has put forth a new approach to controlling dispersion. Using a single metasurface device created with a unique lens model, they could control the dispersion and create an ultra-thin spectrometer with a nanoscale resolution. The new lens design used in this method, which enables both wavelength splitting and light focusing, makes it special.

This technology is extremely appealing for future uses in on-chip integrated photonics, where spectral analysis and information processing may be carried out in a tiny platform, thanks to the compactness and ultrathin nature of the spectrometer.

Using the suggested technology, the wavelengths of the incident light beam are precisely mapped to various locations on the focus plane. The component comprises spatially dispersed gold nanorods resting on a glass substrate. Right circularly polarized light (the converted portion) is converged at the desired positions, i.e., a predesigned ring, upon illumination of left circularly polarized light. Each focal point on the ring, intended to have numerous focal points, corresponds to a particular incident wavelength.

The suggested metasurface spectrometer’s design approach uses a special multi-foci metalens with wavelength information technique.

The suggested method offers a novel method for regulating the desired dispersion under the illumination of monochromatic and polychromatic incident light beams. It is particularly adaptable and durable. The ultra-thin spectrometer is extremely appealing for monolithic on-chip integration with sensor technology due to its flexible design and ultrathin nature.

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