Narrowband multispectral filter set for visible band

Walls, K.; Chen, Q.; Grant, James P.; Collins, Steve; Cumming, David R. S.; Drysdale, Timothy D.

doi:10.1364/oe.20.021917

Cited by 32 publications

(20 citation statements)

References 10 publications

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“…Such a device makes possible in situ spectral measurement of NIR spectra ranging from 722 nm to 880 nm. Walls et al designed, fabricated and characterized a 23-band MSFA of narrowband Fabry–Pérot filters with FWHM (full-width half-maximums) of 22–46 nm, covering the visible range (400–750 nm) [ 73 ]. The fabrication is suitable for direct integration onto CMOS image sensors in industrial foundries, and the cost and complexity is reduced in comparison with other solutions that vary the physical cavity length only.…”

Section: State-of-the-artmentioning

confidence: 99%

Multispectral Filter Arrays: Recent Advances and Practical Implementation

Lapray

Wang

Thomas

et al. 2014

Sensors

226

159

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Thanks to some technical progress in interferencefilter design based on different technologies, we can finally successfully implement the concept of multispectral filter array-based sensors. This article provides the relevant state-of-the-art for multispectral imaging systems and presents the characteristics of the elements of our multispectral sensor as a case study. The spectral characteristics are based on two different spatial arrangements that distribute eight different bandpass filters in the visible and near-infrared area of the spectrum. We demonstrate that the system is viable and evaluate its performance through sensor spectral simulation.

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Section: State-of-the-artmentioning

confidence: 99%

Multispectral Filter Arrays: Recent Advances and Practical Implementation

Lapray

Wang

Thomas

et al. 2014

Sensors

226

159

View full text Add to dashboard Cite

show abstract

“…Because the transmission peak at the FP resonance is determined by the cavity length, different color filters need different insulator thickness, which results in multiple-step patterning if various etalon color filters are integrated. To solve this issue, we investigated a modified etalon color filter, in which the top metal mirror and the insulator layer were etched into subwavelength holes and filled with PMMA [39]. Because the hole size is smaller than the light wavelength, it can be treated as an effective material.…”

Section: Metal-insulator-metal (Mim) Resonator Color Filtersmentioning

confidence: 99%

Transmissive/Reflective Structural Color Filters: Theory and Applications

Wen

Song

et al. 2014

Journal of Nanomaterials

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Structural color filters, which obtain color selection by varying structures, have attracted extensive research interest in recent years due to the advantages of compactness, stability, multifunctions, and so on. In general, the mechanisms of structural colors are based on the interaction between light and structures, including light diffraction, cavity resonance, and surface plasmon resonance. This paper reviews recent progress of various structural color techniques and the integration applications of structural color filters in CMOS image sensors, solar cells, and display.

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“…1. Various research directions have been explored: filter characteristics [8][9][10][11], adequate full resolution image processing, e.g. demosaicing [12][13][14][15][16][17], and other aspects [18,19].…”

Section: Introductionmentioning

confidence: 99%

Energy balance in Spectral Filter Array camera design

Lapray

Thomas

Gouton

et al. 2017

J. Eur. Opt. Soc.-Rapid Publ.

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Background: Multispectral imaging permits to capture more spectral information on object surface properties than color imaging. This is useful for machine vision applications. Transmittance spectral filter arrays combined with a solid state sensor form an emerging technology used for snapshot acquisition. In spectral filter arrays technology, the sensitivities of the camera have critical consequences, not only on applications, but also in the viability of the system. We discuss how to balance the energy of each channel in single exposure multispectral imaging. Methods: We propose a methodology to design filters that permits to reach an optimal balance of energy. We apply this method on practical illuminations combined with a Gaussian model of transmittance filters. Results and discussion: Our results demonstrate that we can optimize energetically the global camera response with few efforts for several cases of illumination environments, for a given sensor and a number of spectral channels. This methodology can be embedded in an application-oriented optimization framework. Conclusions: This methodology enables achieving a great range of optical design, and it can be embedded in an application-oriented optimization framework.

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Narrowband multispectral filter set for visible band

Cited by 32 publications

References 10 publications

Multispectral Filter Arrays: Recent Advances and Practical Implementation

Multispectral Filter Arrays: Recent Advances and Practical Implementation

Transmissive/Reflective Structural Color Filters: Theory and Applications

Energy balance in Spectral Filter Array camera design

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