Infrared polarimetry: Anisotropy of polymer nanofibers

Hinrichs, Karsten; Blevins, Brianna; Furchner, Andreas; Yadavalli, Nataraja Sekhar; Minko, Sergiy

doi:10.1016/j.mne.2022.100116

Cited by 6 publications

(12 citation statements)

References 17 publications

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“…For a detailed spectral discussion and results for azimuthal rotation of the fiber and scaffold see Ref. [7]. Also, for this experiment, the band amplitudes (and their variation in dependence of the azimuthal angle, not shown) are reflecting the anisotropy of the fiber: In the spectral range between 1000-1500 cm -1 , predominant bands have their transition dipole moments in direction of the fiber axis.…”

Section: Resultsmentioning

confidence: 81%

“…[11]. On the right side of Figure 2, the classical s-polarized reflection measurement (purple spectrum) of an oriented PCL fiber scaffold is compared to an AFM-IR spectrum (red) of a single oriented nanofiber [7]. Good agreement between the results of the two methods is seen.…”

Section: Resultsmentioning

confidence: 81%

“…Polarization dependent AFM-IR is a nanoscale technique measuring with an AFM tip the photothermal expansion of the sample upon radiation with a polarized IR laser source [5,6]. For the presented study an AFM-IR measurements (device by BRUKER, Anasys) with a pulsed quantum cascade laser (QCL) in resonance mode were used [6,7]. The operating principles of dual-comb spectroscopy are described in literature [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Exemplarily selected results for the analysis of anisotropic nanofibers [7,11,15] are discussed in the following to underline the far-reaching capabilities of the polarization dependent methods to study the anisotropy from a single nanofiber to a fiber scaffold.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multiscale IR polarimetry of anisotropic nanofibers

Hinrichs¹,

Blevins²,

Furchner³

et al. 2023

Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII

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A straightforward multi-scale infrared (IR) spectroscopic characterization of anisotropic polymer nanofibers for material research and biomedical applications is presented. Polarization dependent IR spectroscopies with spatial resolutions from a few mm down to a few 10 nm (by atomic force microscopy-based infrared spectroscopy, AFM-IR) and time resolutions from the min to µs range (by infrared dual-comb polarimetry, IR-DCP) are used. Compared to AFM-IR, which measures the absorption via the photothermal expansion, and IR ellipsometry, which measures amplitudes of sand p-polarized radiation and their phase differences, IR-DCP measures separately s-and p-polarized amplitudes and phases

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multiscale IR polarimetry of anisotropic nanofibers

Hinrichs¹,

Blevins²,

Furchner³

et al. 2023

Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII

Self Cite

View full text Add to dashboard Cite

show abstract

“…A strong anisotropy is identified in the range of the C-O-C vibrational band. This anisotropy originates from the direction-dependent vibrational absorption due to the predominant alignment of polymer chains within single fibers, but also due to the overall close-to-parallel orientation of the individual fibers 41,42 . Qualitative agreement is observed between the relative phase difference spectra obtained from IR-DCP and FTIR polarimetry (Fig.…”

Section: Anisotropic Nanofiber Scaffoldmentioning

confidence: 99%

Mid-infrared dual-comb polarimetry of anisotropic samples

Hinrichs

Blevins²,

Furchner

et al. 2022

Preprint

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The mid-infrared (mid-IR) anisotropic optical response of a material probes vibrational fingerprints and absorption bands sensitive to order, structure and direction dependent stimuli. Such anisotropic properties play a fundamental role in catalysis, optoelectronic, photonic, polymer and biomedical research and applications. Infrared dual-comb polarimetry (IR-DCP) is introduced as a powerful new spectroscopic method for the analysis of complex dielectric functions and anisotropic samples in the mid-IR range. IR DCP enables novel hyperspectral and time-resolved applications far beyond the technical possibilities of classical Fourier-transform IR (FTIR) approaches. The method unravels structure–spectra relations at high spectral bandwidth (100 cm–1) and short integration times of 65 µs, with previously unattainable time resolutions for spectral IR polarimetric measurements for potential studies of noncyclic and irreversible processes. The polarimetric capabilities of IR-DCP are demonstrated by investigating an anisotropic inhomogeneous free-standing nanofiber scaffold for neural tissue applications. Polarization sensitive multi-angle dual-comb transmission amplitude and absolute phase measurements (separately for ss-, pp-, ps- and sp-polarized light) allow the in-depth probing of the samples’ orientation dependent vibrational absorption properties. Mid-IR anisotropies can be quickly identified by cross-polarized IR-DCP polarimetry.

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Mid‐infrared dual‐comb polarimetry of anisotropic samples

et al. 2023

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The mid-infrared (mid-IR) anisotropic optical response of a material probes vibrational fingerprints and absorption bands sensitive to order, structure, and directiondependent stimuli. Such anisotropic properties play a fundamental role in catalysis, optoelectronic, photonic, polymer and biomedical research and applications. Infrared dual-comb polarimetry (IR-DCP) is introduced as a powerful new spectroscopic method for the analysis of complex dielectric functions and anisotropic samples in the mid-IR range. IR-DCP enables novel hyperspectral and time-resolved applications far beyond the technical possibilities of classical Fourier-transform IR approaches.The method unravels structure-spectra relations at high spectral bandwidth up to 90 cm −1 and short integration times of 65 μs, with previously unattainable time resolutions for spectral IR polarimetric measurements for potential studies of noncyclic and irreversible processes. The polarimetric capabilities of IR-DCP are demonstrated by investigating an anisotropic inhomogeneous freestanding nanofiber scaffold for neural tissue applications. Polarization sensitive multi-angle dual-comb transmission amplitude and absolute phase measurements (separately for ss-, pp-, ps-, and sp-polarized light) allow the in-depth probing of the samples' orientation-dependent vibrational absorption properties. Mid-IR anisotropies can quickly be identified by cross-polarized IR-DCP polarimetry. Key points• A novel dual-comb laser-based technique is established for polarization-dependent mid-infrared spectroscopy.• Independent measurements of spectral s-and p-polarized transmission amplitudes and phases in the μs range.• Visualization of the anisotropy of nanofiber scaffolds as used for neural tissue applications.

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Infrared polarimetry: Anisotropy of polymer nanofibers

Cited by 6 publications

References 17 publications

Multiscale IR polarimetry of anisotropic nanofibers

Multiscale IR polarimetry of anisotropic nanofibers

Mid-infrared dual-comb polarimetry of anisotropic samples

Mid‐infrared dual‐comb polarimetry of anisotropic samples

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