QCL Dual‐Comb Spectroscopy Matures for Applications

Geiser, Markus; Horvath, Raphael; Hayden, Jakob

doi:10.1002/phvs.202100024

Cited by 1 publication

(1 citation statement)

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“…Recent advancements in quantum cascade laser (QCL) technology [4][5][6] have enabled higher temporal resolution sampling at discrete frequencies by providing a widely tunable, high-intensity light source [7,8]. Moreover, QCL frequency combs have enabled the acquisition of full spectra at nanosecond timescales [9] and are now commercially available [10]. However, with all approaches, the signalto-noise ratio deteriorates for higher temporal resolutions, forming a trade-off between spectral and temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Millisecond-resolved infrared spectroscopy study of polymer brush swelling dynamics

Jorissen,

Veldscholte,

Odijk

et al. 2024

Meas. Sci. Technol.

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We present the study of millisecond-resolved polymer brush swelling dynamics using infrared spectroscopy with a home-built quantum cascade laser-based infrared spectrometer at a 1 kHz sampling rate after averaging. By cycling the humidity of the environment of the polymer brush, we are able to measure the swelling dynamics sequentially at different wavenumbers. The high sampling rate provides us with information on the reconformation of the brush at a higher temporal resolution than previously reported. Using spectroscopic ellipsometry, we study the brush swelling dynamics as a reference experiment and to correct artefacts of the infrared measurement approach. This technique informs on the changes in the brush thickness and refractive index. Our results indicate that the swelling dynamics of the polymer brush are poorly described by Fickian diffusion, pointing toward more complicated underlying transport.

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