Miniaturized broadband spectrometer based on a three-segment diffraction grating for spectral tissue sensing

Belay, Gebirie Yizengaw; Hoving, W.; Put, Arthur van der; Vervaeke, Michael; Erps, Jürgen Van; Thienpont, Hugo; Ottevaere, Heidi

doi:10.1016/j.optlaseng.2020.106157

Cited by 20 publications

(10 citation statements)

References 16 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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...

show abstract

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

View full text Add to dashboard Cite

show abstract

“…8 and 9, respectively, where the maximum wavelength of the m th order overlaps with the minimum wavelength of the m + 1th order, as follows: It can be challenging for existing structures to detect the ultraviolet (UV), visible, and NIR ranges simultaneously while maintaining a presentable performance. 30,31 However, the components of substances that are to be measured can exhibit complex characteristics, with spectral lines being distributed across various bands. Accurate identification requires a wider range of detection coverage.…”

Section: Methodsmentioning

confidence: 99%

“…Accurate identification requires a wider range of detection coverage. 31,32 To resolve this contradiction, a dual-band design was proposed, the optical-path diagram being as shown in Fig. 4a.…”

Section: Design Of a Dual-band Spectrometermentioning

confidence: 99%

Monolithic Miniature Glass Spectrometer

Qian,

Chu

2023

Appl Spectrosc

View full text Add to dashboard Cite

This paper presents a monolithic spectrometer based on a plano-convex glass lens and achieves a resolution better than 0.7 nm in the spectral range of 550–720 nm. In the monolithic instrument, all components were fixed in the machined lens, resulting in a much smaller size and more stable assembly than traditional mini spectrometers. Additionally, a dual-band design was proposed and demonstrated to extend the spectral range from the visible band (550–700 nm) to the near-infrared band (800–900 nm), thus allowing more characteristic spectral fingerprints for improved material identification. The feasibility of compensating the residual aberrations caused by structural limitations with a specifically designed aberration-correcting grating is further detailed.

show abstract

“…11 Recent research has been focused on both miniaturizing and reducing the cost of spectrometers to increase their availability and utility. [12][13][14][15][16] Spectrometers use various methods to separate the light into composite wavelengths, including diffraction gratings, 17 wedge filters, 18 Fourier transform, 19 metasurfaces, 20 and tunable filters. 21 Each technique requires collimated light for optimal performance.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized short-wavelength infrared spectrometer for diffuse light applications

Westover,

Westhoff,

Poff

et al. 2023

Adv. Photon. Nexus

View full text Add to dashboard Cite

A miniaturized short-wavelength infrared spectrometer for use with diffuse light was created by combining a thin form factor carbon nanotube composite collimator, a linear variable filter, and an InGaAs photodiode array. The resulting spectrometer measures 3 mm × 4 mm × 14 mm and shows a significant improvement in resolution over a spectrometer without the collimator when used with diffuse light. Its small size and high throughput make it ideal for applications such as wearable optical sensing, where light from highly scattering tissue is measured. Plethysmographic measurements on the wrist were demonstrated, showing rapid data collection with diffuse light.

show abstract

Miniaturized broadband spectrometer based on a three-segment diffraction grating for spectral tissue sensing

Cited by 20 publications

References 16 publications

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

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

Monolithic Miniature Glass Spectrometer

Miniaturized short-wavelength infrared spectrometer for diffuse light applications

Contact Info

Product

Resources

About