Modeling and design of a multichannel chromatic aberration compensated imaging system

Belay, Gebirie Yizengaw; Ottevaere, Heidi; Vervaeke, Michael; Erps, Jürgen Van; Thienpont, Hugo

doi:10.1117/12.2190603

Cited by 2 publications

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“…Compared with the reported SWIR reconstructive on‐chip spectrometer such as QD spectrometer using at least 195 kinds of QDs, [ 20–22 ] our chip‐spectrometer achieved 3 times higher narrowband spectral resolution with 3.9 times less units number ( Table 1 ). Moreover, this resolution is more than 5 times higher than conventional miniature spectrometers based on grating, [ 38 ] prism, [ 39 ] and linear variable filter. [ 36 ]…”

Section: Resultsmentioning

confidence: 99%

Short‐Wave Infrared Chip‐Spectrometer by Using Laser Direct‐Writing Grayscale Lithography

Xuan

Wang

Liu

et al. 2022

Advanced Optical Materials

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Short-wave infrared (SWIR) spectrometer has been a critical device in spectral analysis fields like agriculture, [1,2] environmental monitoring, [3] astronomy, [4,5] etc. Conventionally, the infrared spectrometer is bulky and delicate due to the spectral division device, such as grating and prism, which limited its applications. The demand and potential for compact spectrometers are enormous for portable and on-chip applications like smartphone spectrometer, [6,7] hyperspectral imaging, [8][9][10] etc. The key to miniaturizing spectrometers is replacing the bulky spectral split devices with miniature photonic devices. [11] Besides, combing with reconstruction algorithms such as compressed sensing and machine learning, the incident light spectrum can be reconstructed with a few numbers of filters. [8,[12][13][14] In recent years, such reconstructive micospectrometer based on Si-based complementary metal-oxide-semiconductor (CMOS) sensors in visible range are primarily investigated. In comparison, the microspectrometer in SWIR range is much more useful to acquire object information in practical applications. Strategies based on photonic devices slab, [9,10,[15][16][17][18][19] quantum dot (QD) slab, [20][21][22] nanowire, [23,24] have been proposed for portable and on-chip microspectrometer. The number and variety of filter spectra determined the resolution of reconstructive microspectrometer. Micro-nano photonic device filters like photonic crystal (PC), metamaterial, Fabry-Perot (FP) cavities can acquire distinctive spectra by varying structure morphology parameters. Material-based filters like QD slab can acquire different spectra by adjusting their size, composition, or bias. Those filters mentioned above are usually fabricated onto a separated slab and then pasted or bonded with a detector chip. In practical applications, the separated slab is fragile and difficult to well-matching with detector pixels, leading to spectral crosstalk and other problems. Recently proposed detector-only reconstructive microspectrometer based on nanowires, [23,24] black phosphorus [25] is ultra-compact without external filters. It has a stable structure with wavelength scale size, but the number of response spectra is hard to increase significantly and limits its resolution.Among these micro-nano filters, FP microcavities array has low spectral correlation coefficient by varying its cavity length, Short-wave infrared (SWIR) information is critical for material analysis, imaging sensing, and other fields. To acquire SWIR spectrum with compact devices, strategies for reconstructive microspectrometer have emerged, such as photonic crystal and quantum dot filter. However, the current SWIR microspectrometer needs many filters with insufficient resolution. In this work, the authors develop a SWIR chip-spectrometer based on Fabry-Perot microcavities array which can be fabricated by using fast and low-cost UV laser directwriting grayscale lithography. The ultra-compact chip-spectrometer can work in a very wide range from 900 to 1700 nm wi...

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Section: Resultsmentioning

confidence: 99%

Short‐Wave Infrared Chip‐Spectrometer by Using Laser Direct‐Writing Grayscale Lithography

Xuan

Wang

Liu

et al. 2022

Advanced Optical Materials

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“…Fabricating a diffractive surface with very small features is difficult because of the high precision requirement of the machining process. One way of reducing the challenge of manufacturing is designing the diffractive surface at a higher diffraction order [16][17][18] . Therefore, we have designed the diffractive surface of the third optical channel at the second diffraction order which doubles the surface relief height, compared to the first and second channel.…”

Section: Design Of the Imaging System With Hybrid Lensesmentioning

confidence: 99%

Photonics-enhanced smart imaging systems

Ottevaere

Belay

Thienpont

2016

Applications of Digital Image Processing XXXIX

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We discuss different photonics-enhanced multichannel multiresolution imaging systems in which the different channels have different imaging properties, namely a different FOV and angular resolution, over different areas of an image sensor. This could allow different image processing algorithms to be implemented to process the different images. A basic threechannel multiresolution imaging system was designed at 587.6 nm where each of the three channels consist of four aspherical lens surfaces. These lenses have been fabricated in PMMA through ultra-precision diamond tooling and afterwards assembled with aperture stops, baffles and a commercial CMOS sensor. To reduce the influence of chromatic aberrations, hybrid lenses, which contain diffractive surfaces on top of refractive ones, have been included within the previous designs of the three channels. These hybrid lenses have also been fabricated through ultra-precision diamond tooling, assembled and verified in an experimental demonstration. The three channels with hybrid lenses show better image quality (both in the simulation and experiment) compared to the purely refractive three channel design. Because of a limited depth of field of the aforementioned multichannel multiresolution imaging systems, a voltage tunable lens has been integrated in the first channel to extend the depth of field of the overall system. The refocusing capability has significantly improved the depth of field of the system and ranged from 0.25 m to infinity compared to 9 m to infinity for the aforementioned basic three-channel multiresolution imaging system.

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Modeling and design of a multichannel chromatic aberration compensated imaging system

Cited by 2 publications

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Short‐Wave Infrared Chip‐Spectrometer by Using Laser Direct‐Writing Grayscale Lithography

Short‐Wave Infrared Chip‐Spectrometer by Using Laser Direct‐Writing Grayscale Lithography

Photonics-enhanced smart imaging systems

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