Waveguide-enhanced Raman spectroscopy

Ettabib, Mohamed A.; Liu, Zhen; Zervas, Michalis N.; Bartlett, Philip N.; Wilkinson, James S.

doi:10.1038/s43586-023-00281-4

Nat Rev Methods Primers

2024

DOI: 10.1038/s43586-023-00281-4

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Waveguide-enhanced Raman spectroscopy

Mohamed A. Ettabib,

Zhen Liu,

Michalis N. Zervas

et al.

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2024

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Cited by 3 publications

References 92 publications

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Seeing beyond Labels: Optical Technologies Reshaping Cell Culture Monitoring in Biomedicine

Charconnet,

Plou

2024

ACS Appl. Eng. Mater.

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Seeing beyond Labels: Optical Technologies Reshaping Cell Culture Monitoring in Biomedicine

Charconnet,

Plou

2024

ACS Appl. Eng. Mater.

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Direct 3D-printed ring-resonator photonic circuit on a dual core fiber tip for remote sensing applications

Gill,

Kukin,

Marom

2024

Opt. Lett.

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On-chip optical sensors using ring- and disk-resonators have many potential sensing applications, yet robust and efficient fiber-to-chip coupling and the differing form factor between the two pose deployment challenges. To resolve this, we 3D-printed a ring-resonator onto the tip of a dual-core fiber and demonstrate its use as a remote temperature sensor. The fiber-tip optical circuit is fabricated using direct laser writing (DLW) with two-photon absorption photopolymer material IP-Dip, forming micrometer-scale waveguide cores having a refractive index of 1.53 with a surrounding air cladding. We connect the two-fiber cores by a printed bus-waveguide, utilizing total internal reflection mirrors, allowing light launched into one core to be guided back to the other core. Furthermore, a DLW printed racetrack resonator evanescently coupled to the bus waveguide (Q ∼ 3000) imposes spectral dips on resonance wavelengths. Light sent down into one core is interrogated upon return from the second core, all from the distal end of the sensor. When the sensing end’s temperature is varied, we find a sensitivity of 78 pm/K, due to the polymer’s thermo-optic index variation. The ring-resonator could be functionalized for other sensing applications.

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Online Monitoring of Catalytic Processes by Fiber-Enhanced Raman Spectroscopy

Kelly,

Koch,

Lascola

et al. 2024

Sensors

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An innovative solution for real-time monitoring of reactions within confined spaces, optimized for Raman spectroscopy applications, is presented. This approach involves the utilization of a hollow-core waveguide configured as a compact flow cell, serving both as a conduit for Raman excitation and scattering and seamlessly integrating into the effluent stream of a cracking catalytic reactor. The analytical technique, encompassing device and optical design, ensures robustness, compactness, and cost-effectiveness for implementation into process facilities. Notably, the modularity of the approach empowers customization for diverse gas monitoring needs, as it readily adapts to the specific requirements of various sensing scenarios. As a proof of concept, the efficacy of a spectroscopic approach is shown by monitoring two catalytic processes: CO2 methanation (CO2 + 4H2 → CH4 + 2H2O) and ammonia cracking (2NH3 → N2 + 3H2). Leveraging chemometric data processing techniques, spectral signatures of the individual components involved in these reactions are effectively disentangled and the results are compared to mass spectrometry data. This robust methodology underscores the versatility and reliability of this monitoring system in complex chemical environments.

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Waveguide-enhanced Raman spectroscopy

Cited by 3 publications

References 92 publications

Seeing beyond Labels: Optical Technologies Reshaping Cell Culture Monitoring in Biomedicine

Seeing beyond Labels: Optical Technologies Reshaping Cell Culture Monitoring in Biomedicine

Direct 3D-printed ring-resonator photonic circuit on a dual core fiber tip for remote sensing applications

Online Monitoring of Catalytic Processes by Fiber-Enhanced Raman Spectroscopy

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