Broadband Mueller ellipsometer as an all-in-one tool for spectral and temporal analysis of mutarotation kinetics

Vala, Daniel; Mičica, Martin; Cvejn, Daniel; Postava, Kamil

doi:10.1039/d3ra00101f

Cited by 5 publications

(2 citation statements)

References 55 publications

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“…The study of complex, anisotropic materials presents another promising frontier for SE. The ability to measure the complete Mueller matrix could open up new research avenues for materials previously considered too complex for accurate measurement [56].…”

Section: Discussionmentioning

confidence: 99%

Spectroscopic Ellipsometry: Advancements, Applications and Future Prospects in Optical Characterization

Politano,

Versace

2023

Spectroscopy Journal

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Spectroscopic ellipsometry (SE), a non-invasive optical technique, is a powerful tool for characterizing surfaces, interfaces, and thin films. By analyzing the change in the polarization state of light upon reflection or transmission through a sample, ellipsometry provides essential parameters such as thin film thickness (t) and optical constants (n, k). This review article discusses the principles of ellipsometry, including the measurement of key values ∆ and Ψ, and the complex quantity ρ. The article also presents the Fresnel equations for s and p polarizations and the importance of oblique angles of incidence in ellipsometry. Data analysis in ellipsometry is explored, including the determination of bandgap and data referencing the electrical properties of materials. The article emphasizes the importance of choosing the appropriate models to fit ellipsometric data accurately, with examples of the Cauchy and Lorentz models. Additionally, the Kramers–Kronig relations are introduced, illustrating the connection between real and imaginary components of optical constants. The review underscores the significance of ellipsometry as a non-destructive and versatile technique for material characterization across a wide range of applications.

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Section: Discussionmentioning

confidence: 99%

Spectroscopic Ellipsometry: Advancements, Applications and Future Prospects in Optical Characterization

Politano,

Versace

2023

Spectroscopy Journal

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“…All these results pose problems of studying the THz radiation–heterogeneous tissues interactions and adapting the radiation transfer theory for describing them. Whereby we note a large number of polarization-sensitive systems capable of studying turbid biological tissues in the visible and infrared ranges 38 – 45 , such instruments are rare in the THz range, which hampers further research and developments in THz biophotonics and medical imaging. To mitigate this difficulty, in this paper, quantitative polarization-sensitive -resolution THz SI microscope is developed based on free-standing metal-wire-grid polarizer and analyzer, a continuous-wave 0.6 THz BWO emitter, and a Golay detector.…”

Section: Introductionmentioning

confidence: 99%

Quantitative polarization-sensitive super-resolution solid immersion microscopy reveals biological tissues’ birefringence in the terahertz range

Chernomyrdin,

Il’enkova,

Zhelnov

et al. 2023

Sci Rep

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Terahertz (THz) technology offers a variety of applications in label-free medical diagnosis and therapy, majority of which rely on the effective medium theory that assumes biological tissues to be optically isotropic and homogeneous at the scale posed by the THz wavelengths. Meanwhile, most recent research discovered mesoscale ($$\sim \lambda $$ ∼ λ ) heterogeneities of tissues; $$\lambda $$ λ is a wavelength. This posed a problem of studying the related scattering and polarization effects of THz-wave–tissue interactions, while there is still a lack of appropriate tools and instruments for such studies. To address this challenge, in this paper, quantitative polarization-sensitive reflection-mode THz solid immersion (SI) microscope is developed, that comprises a silicon hemisphere-based SI lens, metal-wire-grid polarizer and analyzer, a continuous-wave 0.6 THz ($$\lambda = 500$$ λ = 500 µm) backward-wave oscillator (BWO), and a Golay detector. It makes possible the study of local polarization-dependent THz response of mesoscale tissue elements with the resolution as high as $$0.15 \lambda $$ 0.15 λ . It is applied to retrieve the refractive index distributions over the freshly-excised rat brain for the two orthogonal linear polarizations of the THz beam, aimed at uncovering the THz birefringence (structural optical anisotropy) of tissues. The most pronounced birefringence is observed for the Corpus callosum, formed by well-oriented and densely-packed axons bridging the cerebral hemispheres. The observed results are verified by the THz pulsed spectroscopy of the porcine brain, which confirms higher refractive index of the Corpus callosum when the THz beam is polarized along axons. Our findings highlight a potential of the quantitative polarization THz microscopy in biophotonics and medical imaging.

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Continuous-wave cavity ringdown for high-sensitivity polarimetry and magnetometry measurements

Tran,

Edwards,

Tew

et al. 2024

The Journal of Chemical Physics

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We report the development of a novel variant of cavity ringdown polarimetry using a continuous-wave laser operating at 532 nm for highly precise chiroptical activity and magnetometry measurements. The key methodology of the apparatus relies upon the external modulation of the laser frequency at the frequency splitting between non-degenerate left- and right-circularly polarized cavity modes. The method is demonstrated by the evaluation of the Verdet constants of crystalline CeF3 and fused silica, in addition to the observation of gas- and solution-phase optical rotations of selected chiral molecules. Specifically, optical rotations of (i) vapors of α-pinene and R-(+)-limonene, (ii) mutarotating D-glucose in water, and (iii) acidified L-histidine solutions are determined. The detection sensitivities for the gas- and solution-phase chiral activity measurements are ∼30 and ∼120μdeg over a 30 s detection period per cavity round trip pass, respectively. Furthermore, the measured optical rotations for R-(+)-limonene are compared with computations performed using the TURBOMOLE quantum chemistry package. The experimentally observed optically rotatory dispersion of this cyclic monoterpene was thus rationalized via a consideration of its room temperature conformer distribution as determined by the aforementioned single-point energy calculations.

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Broadband Mueller ellipsometer as an all-in-one tool for spectral and temporal analysis of mutarotation kinetics

Abstract: We utilize a commercial broadband Mueller ellipsometer to monitor the kinetics of glucose mutarotation through the dispersion of its optical activity.

Cited by 5 publications

References 55 publications

Spectroscopic Ellipsometry: Advancements, Applications and Future Prospects in Optical Characterization

Spectroscopic Ellipsometry: Advancements, Applications and Future Prospects in Optical Characterization

Quantitative polarization-sensitive super-resolution solid immersion microscopy reveals biological tissues’ birefringence in the terahertz range

Continuous-wave cavity ringdown for high-sensitivity polarimetry and magnetometry measurements

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