Nanostructure-modulated planar high spectral resolution spectro-polarimeter

Stoevelaar, L.P.; Berzinš, Jonas; Silvestri, F.; Fasold, Stefan; Kamali, Khosro Zangeneh; Knopf, Heiko; Eilenberger, Falk; Setzpfandt, Frank; Pertsch, Thomas; Bäumer, Stefan; Gerini, G.

doi:10.1364/oe.392536

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…The sensor concept we will employ has been introduced in [20,21,22]. It consists of a multilayer structure that can perform both polarization and spectral filtering and can be integrated on top of a CMOS/CCD sensor.…”

Section: Sensor Conceptmentioning

confidence: 99%

“…Since circular polarization in atmospheric remote sensing from space is orders of magnitude smaller than linear polarization and to our knowledge not strictly required for aerosol sensing, the waveplate concept has not been further investigated. Experimental results of single cavity filters manufactured in the SWIR can be found in [20], where a single cavity DBR with metasurface was created and tested by making use of aSi:H pillars (amorphous hydrogenated silicon). While the materials used for those investigations are different than the ones proposed here, those measurements act as proof of principle for the presented concept.…”

Section: Sensor Conceptmentioning

confidence: 99%

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A multispectral polarimetric instrument concept based on metasurface filters

Ceccotti,

Brenny,

Gerini

et al. 2023

Sensors, Systems, and Next-Generation Satellites XXVII

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Remote sensing of aerosols requires spectropolarimetric information over different viewing angles with demanding polarimetric accuracy and growing interest for smaller designs. In this paper, we investigate an instrument design that implements a metasurface filter which enables both functions simultaneously, allowing further miniaturization and integrability. The instrument offers 1 km ground sampling distance over its entire field of view, in Low Earth Orbit, and the concept makes use of six modules to cover the wide field of view requested for aerosol retrieval with a total of seven radiation-resistant lenses. This choice enables an optical volume per module under 50mm × 50mm × 150mm and smaller relative angles of incidence. The filters are designed to cover six spectral bands from 443 nm to 870 nm with a spectral resolution of 2 nm to 5 nm. The wide spectral band is achieved by using three distributed Bragg reflectors with bandpass filters, integrated in one double-cavity structure that can be glued on a CCD/CMOS sensor. The two cavities, operating as a metasurface, contain scatterers of different dimensions enabling the fine-tuning of the spectral resonance and the polarization filtering. Multiscale forward modeling techniques are employed for the estimation of the polarimetric accuracy with optical aberrations and realistic coatings. Using radiance values from the PACE mission, polarimetric errors and SNR at each pixel are estimated and compared to requirements of state-of-the-art missions.

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Section: Sensor Conceptmentioning

confidence: 99%

Section: Sensor Conceptmentioning

confidence: 99%

A multispectral polarimetric instrument concept based on metasurface filters

Ceccotti,

Brenny,

Gerini

et al. 2023

Sensors, Systems, and Next-Generation Satellites XXVII

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recent research has shown that by introducing metasurfaces into the FP cavity, such as high refractive index nanostructure arrays, the effective refractive index can be adjusted [28][29][30][31]. The incorporation of high refractive index nanostructures increases the phase shift of the cavity and the corresponding red shift of the resonance peak [32] so that the central wavelength can be tuned.…”

Section: Introductionmentioning

confidence: 99%

Design of a dual-channel narrow band filter based on metasurface

Liu,

Luo

et al. 2023

J. Phys.: Conf. Ser.

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We proposed a dual-channel narrow band filter consisting of top and bottom-distributed Bragg reflectors (DBRs) and a dielectric interlayer inserted with a metasurface. Through the design of the metasurface, the two channels of the filter are guaranteed to exhibit high-quality factors with transmittance beyond 90% and full width at half maximum (FWHM) less than 10 nm. We demonstrate that the central wavelengths of each dual-channel filter can be controlled with a total of 50 nm shifts by only changing the width of the metasurface. Compared with the traditional dual-channel filter, our design is easier to fabricate and more convenient to tune the central wavelength, which is promising for ultracompact optical devices.

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“…The working principle of these cameras is similar to a conventional RGB camera. In the case of RGB cameras, the color information is generated using spectral filters on the camera sensor arranged in a 2-by-2 Bayer matrix, from which a full scale color image is reconstructed [10,11]. This approach is enhanced for hyperspectral imaging by increasing the size of the filter matrix, e.g.…”

Section: Introductionmentioning

confidence: 99%

Picosecond Hyperspectral Fringe Pattern Projection for 3D Surface Measurement

Ritter¹,

Ponce²,

Geib³

et al. 2022

Preprint

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Active stereovision systems for the 3D measurement of surfaces rely on the sequential projection of different fringe patterns onto the scene to robustly and accurately generate 3D surface data. This limits the temporal resolution to the time by which a sufficiently high number of patterns can be projected and recorded. By encoding patterns spectrally and recording them with a hyperspectral imager, it is possible to record several patterns in a single image, limiting the temporal resolution to only the duration of the illumination. A picosecond 3D surface measurement was demonstrated using a high pulse energy femtosecond Ti:Sa laser, spectrally broadened in a hollow core fiber, and two hyperspectral cameras recording the patterns generated by diffraction at an Echelle grating.

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Nanostructure-modulated planar high spectral resolution spectro-polarimeter

Cited by 12 publications

References 34 publications

A multispectral polarimetric instrument concept based on metasurface filters

A multispectral polarimetric instrument concept based on metasurface filters

Design of a dual-channel narrow band filter based on metasurface

Picosecond Hyperspectral Fringe Pattern Projection for 3D Surface Measurement

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