Chip-Based Resonance Raman Spectroscopy Using Tantalum Pentoxide Waveguides

Coucheron, David A.; Wadduwage, Dushan N.; Murugan, Ganapathy Senthil; So, Peter T. C.; Ahluwalia, Balpreet Singh

doi:10.1109/lpt.2019.2915671

Cited by 16 publications

(22 citation statements)

References 25 publications

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“…Working in a lower wavelength regime also helps to increase the scattered signal intensity since the scattering varies inversely as the fourth power of wavelength. However, this is often accompanied by the presence of unwanted fluorescence background [52].…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Integrated Nanophotonic Waveguide-Based Devices for IR and Raman Gas Spectroscopy

Alberti

Datta

Jágerská

2021

Sensors

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On-chip devices for absorption spectroscopy and Raman spectroscopy have been developing rapidly in the last few years, triggered by the growing availability of compact and affordable tunable lasers, detectors, and on-chip spectrometers. Material processing that is compatible with mass production has been proven to be capable of long low-loss waveguides of sophisticated designs, which are indispensable for high-light–analyte interactions. Sensitivity and selectivity have been further improved by the development of sorbent cladding. In this review, we discuss the latest advances and challenges in the field of waveguide-enhanced Raman spectroscopy (WERS) and waveguide infrared absorption spectroscopy (WIRAS). The development of integrated light sources and detectors toward miniaturization will be presented, together with the recent advances on waveguides and cladding to improve sensitivity. The latest reports on gas-sensing applications and main configurations for WERS and WIRAS will be described, and the most relevant figures of merit and limitations of different sensor realizations summarized.

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Section: Raman Spectroscopymentioning

confidence: 99%

“…As a consequence, this requires less integration time than that from the waveguide surface [28]. However, signals from the surface can provide additional spatially resolved information [52].…”

Section: Configuration and Integrationmentioning

confidence: 99%

Integrated Nanophotonic Waveguide-Based Devices for IR and Raman Gas Spectroscopy

Alberti

Datta

Jágerská

2021

Sensors

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“…All the elements have indeed been demonstrated individually: spectrometers [1][2][3], lasers [4,5], spectral filters necessary to remove the strong excitation radiation [6] and also Raman sensors that boost the Raman response [7][8][9]. Recent progress [10][11][12][13][14] has been made regarding the Raman sensor itself by taking advantage of the evanescent field around a dielectric waveguide that allows an analyte to be probed over long optical path lengths. While this approach is effective in boosting the Raman signal, it also introduces an undesired photon background that ultimately reduces the signal-to-background ratio of any acquired Raman spectrum [15].…”

Section: Introductionmentioning

confidence: 99%

Mitigation of photon background in nanoplasmonic all-on-chip Raman sensors

et al. 2020

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In the quest for a more compact and cheaper Raman sensor, photonic integration and plasmonic enhancement are central. Nanoplasmonic slot waveguides exhibit the benefits of SERS substrates while being compatible with photonic integration and mass-scale (CMOS) fabrication. A difficulty in pursuing further integration of the Raman sensor with lasers, spectral filters, spectrometers and interconnecting waveguides lies in the presence of a photon background generated by the excitation laser field in any dielectric waveguide constituting those elements. Here, we show this problem can be mitigated by using a multi-mode interferometer and a nanoplasmonic slot waveguide operated in back-reflection to greatly suppress the excitation field behind the sensor while inducing very little photon background.

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“…Raman scattered light is coupled back into these waveguides and sent to a spectrometer for chemical analysis. Prior work has demonstrated the validity and promises of this sensing technique using various waveguide material platforms including silicon nitride (Si 3 N 4 ), alumina (Al 2 O 3 ), Ta 2 O 5 , and TiO 2 [1][2][3][4][5][6][7][8][9]. Unfortunately, not all WERS system components can be easily integrated on a single chip, since WERS requires high-power monochromatic light sources at visible or near-infrared wavelengths, high-extinction ratio filters, and sensitive detectors.…”

Section: Introductionmentioning

confidence: 99%