On-Chip Mid-Infrared Photothermal Spectroscopy Using Suspended Silicon-on-Insulator Microring Resonators

Vasiliev, Anton; Malik, Aditya; Muneeb, Muhammad; Kuyken, Bart; Baets, Roel; Roelkens, Günther

doi:10.1021/acssensors.6b00428

Cited by 52 publications

(33 citation statements)

References 43 publications

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“…The detection limits for H 2 O obtained by the QEPTAS sensor at distances of 1 m and 2 m were~12 ppm and~55 ppm, corresponding to a NNEA coefficients of 8.4 × 10 −7 W•cm −1 •Hz −1/2 and 3.7 × 10 −6 W•cm −1 •Hz −1/2 , respectively. Compared to other photothermal spectroscopy techniques based on a silicon resonator [36] or a fiber-coupled Fabry-Pérot interferometer [37], the NNEA of QEPTAS is competitive. Yufei Ma et al…”

Section: Experiments and Resultsmentioning

confidence: 99%

Quartz-Enhanced Photothermal-Acoustic Spectroscopy for Trace Gas Analysis

et al. 2019

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A crystal quartz tuning fork (QTF) was used as a detector to collect and amplify laser-induced photoacoustic and photothermal waves simultaneously for trace chemical analysis. A wavelength modulation technique was applied to the proposed quartz-enhanced photothermal-acoustic spectroscopy (QEPTAS) to improve the detection signal-to-noise ratio. The QTF detector was exposed to the illumination of a near-infrared distributed feedback laser at distances of 1 m and 2 m to evaluate the QEPTAS sensor performance. The QEPTAS sensor performance was determined by detecting water vapor in ambient air using a near-infrared distributed feedback laser with a power of ~10 mW and a wavelength of 1.39 μm. With an optimized modulation depth of 0.47 cm−1, the normalized noise equivalent absorption (NNEA) coefficients of 8.4 × 10−7 W·cm−1·Hz−1/2 and 3.7 × 10−6 W·cm−1·Hz−1/2 were achieved for a distance of 1 m and 2 m, respectively. The developed QEPTAS technique reduces the requirements for laser beam quality, resulting in a simple but robust sensor structure and demonstrates the ability of remote sensing of gas concentrations.

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Section: Experiments and Resultsmentioning

confidence: 99%

Quartz-Enhanced Photothermal-Acoustic Spectroscopy for Trace Gas Analysis

et al. 2019

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“…With 10-s integration time, the sensor can detect hydrocarbons down to 3.2 ppmv. Further sensitivity boost into the ppbv regime mandates new detection schemes that can transcend the optical path length limit, for example, through cavity-enhanced photothermal spectroscopy [218][219][220].…”

Section: Performance Projectionmentioning

confidence: 99%

Mid-infrared integrated photonics on silicon: a perspective

et al. 2017

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Abstract:The emergence of silicon photonics over the past two decades has established silicon as a preferred substrate platform for photonic integration. While most silicon-based photonic components have so far been realized in the near-infrared (near-IR) telecommunication bands, the mid-infrared (mid-IR, 2-20-μm wavelength) band presents a significant growth opportunity for integrated photonics. In this review, we offer our perspective on the burgeoning field of mid-IR integrated photonics on silicon. A comprehensive survey on the state-of-the-art of key photonic devices such as waveguides, light sources, modulators, and detectors is presented. Furthermore, on-chip spectroscopic chemical sensing is quantitatively analyzed as an example of mid-IR photonic system integration based on these basic building blocks, and the constituent component choices are discussed and contrasted in the context of system performance and integration technologies.

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“…The spectrum could be observed by scanning the wavelength of Pu. The wavelength could be scanned by modulating the light source [11][12][13][14] or by filtering the white light with a monochromator or optical filters (OFs). [15][16][17] However, the rapid wavelength scanning of the light source, at a sufficient range, is difficult.…”

Section: Introductionmentioning

confidence: 99%

Proof‐of‐Principle Experiment of the Pseudorandom Multiplexing of White‐Pump Light for Spectral Photothermal Microscopy

et al. 2020

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Absorption spectroscopy, coupled with photothermal super‐resolution microscopy, is enabled by the frequency division multiplexing of the pump‐light (Pu) wavelength whose spectral component is discriminated by the modulation frequency. This demonstrates a great advantage in availing multicolor image information. However, the response gain of the thermal lens signal to the spectral components is not uniform because of the limited relaxation rate of the thermal lens, i.e., the gains of the components assigned to the high‐frequency modulations are diminished, thus resulting in a distorted absorption spectrum. In this study, white‐pump light (Pu) is multiplexed by pseudonoise sequences (PNSs) to avoid the distortion. The frequency bandwidth of the PNSs is equalized, and the gains of the thermal lens generation to the respective wavelength components are balanced. The obtained results indicate that the modulation‐waveform deformation due to the slow responses of the sample can also distort spectra. To mitigate the problem, the countermeasures required to compensate for this distortion are also discussed.

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On-Chip Mid-Infrared Photothermal Spectroscopy Using Suspended Silicon-on-Insulator Microring Resonators

Cited by 52 publications

References 43 publications

Quartz-Enhanced Photothermal-Acoustic Spectroscopy for Trace Gas Analysis

Quartz-Enhanced Photothermal-Acoustic Spectroscopy for Trace Gas Analysis

Mid-infrared integrated photonics on silicon: a perspective

Proof‐of‐Principle Experiment of the Pseudorandom Multiplexing of White‐Pump Light for Spectral Photothermal Microscopy

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