Meta-surfaces, planar arrays of subwavelength-spaced optical elements that modulate incident light, are poised to revolutionize the field of optics. Traditional optical elements are produced by labor-intensive glass molding techniques, and often require multiple components to function effectively for light of different wavelengths and correct for aberrations. Meta-surfaces can be fabricated by scalable manufacturing processes employed by the semiconductor industry and can match or surpass the capabilities of traditional lenses in a compact format.
The following invention from Federico Capasso’s research group pertains to Meta-surface-based spectrometers. Spectrometers are useful in a range of applications, from monitoring environmental pollutants to detecting specific antibodies in diagnostics. Additionally, the ability to distinguish between chiral isomers is useful in the pharmaceutical and agrochemical manufacturing industries.
Super-Dispersive Off-Axis Meta-Lenses for High Resolution Compact Spectroscopy (6318)
A compact spectroscope composed of off-axis meta-lenses that can achieve focusing at very large angles (up to 80°), resulting in super-dispersive characteristics to resolve incident light of different wavelengths in the mid-infrared spectrum. By combining multiple meta-lenses designed to operate at different wavelengths onto a single substrate, spectral resolution is preserved across wide range (90% efficiency between 1.1-1.6 µm).
(L) SEM image of an off-axis meta-lens (R) Photograph of a meta-spectrometer (meta-lenses and camera)
