Method for the determination of the optical properties of highly conjugated pigments

Musfeldt, J. L.; Tanner, D.; Paine, Anthony J.

doi:10.1364/josaa.10.002648

Cited by 30 publications

(16 citation statements)

References 13 publications

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“…The data summarized in Table shows that analysis based on these relations was sufficiently accurate in the vis‐NIR wavelength range (400–1,000 nm). As evidently presented in this table, our modeling experimental errors were estimated to be roughly ±5%, which were similar to previous quantification surveys . The determination and tracking the changes in the optical parameters ( n and k ) of the melanoma cells at the accessible wavelength and for normal skin fibroblasts and adipose tissue was completed.…”

Section: Resultssupporting

confidence: 76%

Non‐invasive Reflectance Spectroscopy for Normal and Cancerous Skin Cells Refractive Index Determination: An In Vitro Study

et al. 2019

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Background and Objective: Optical reflectance spectroscopy is a non-invasive technique for optical characterization of biological samples. Any alteration in a cell from normal or carcinogenic causes will change its refractive index. The aim of this study is to develop a computerized program for extraction of a refractive index of normal and cancerous skin cell lines, including melanoma, fibroblast, and adipose cells, using visible near-infrared reflectance spectra and the Kramers-Kronig (K-K) relations. Materials and Method: A fiber optic reflectance spectrometer in visible near-infrared wavelength was used for spectrum acquisition in an in vitro study. Human skin cell lines for melanoma (A375), fibroblast, and adipose sample were cultured for optical spectroscopy. Following data acquisition, an analytical MATLAB code was developed to run the K-K relations. The program was validated for three biological samples using an Abbe refractometer. Results: The validation error (below 5%) and determination of changes in the refractive index of melanoma, normal fibroblasts, and adipose skin cells was carried out at wavelengths of 450-950 nm. The refractive index of melanoma was 1.59270 ± 0.0550 at 450 nm, the minimum amount of 1.27790 ± 0.0550 to 1.321 ± 0.0550 at 620 nm, and rose sharply to 1.44321 ± 0.0550 at 935 nm. The respective results for fibroblast and adipose tissue cells were 1.33282 ± 0.0134 and 1.28345 ± 0.0163 at 450 nm with an increasing trend to 1.30494 ± 0.0135 and 1.26716 ± 0.0163 at 935 nm. Conclusion: Refractive index characteristics show potential for cancer screening and diagnosis. The results show that optical spectroscopy is a promising, non-invasive tool for assessment of the refractive index of living biological cells in in vitro settings. Tracking changes in the refractive index allows screening of normal and abnormal cells for probable alterations in a non-invasive label-free method. Lasers Surg. Med.

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Section: Resultssupporting

confidence: 76%

Non‐invasive Reflectance Spectroscopy for Normal and Cancerous Skin Cells Refractive Index Determination: An In Vitro Study

et al. 2019

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“…The measured reflectance with the incident laser polarization along both the X-and Y-directions is presented in Figure S2. From a Kramers-Kronig transform 34 of the reflectance data we calculate the absorption coefficient as a function of frequency (see supplementary information for details). Figure 2b shows the absorption spectra with the incident laser polarization along both the X-and Y-directions ( and ) in a photon energy range from 1.5 eV to 2.7 eV.…”

Section: Resultsmentioning

confidence: 99%

Linear Dichroism Conversion in Quasi‐1D Perovskite Chalcogenide

Cong

Niu

et al. 2019

Advanced Materials

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Anisotropic photonic materials with linear dichroism property are crucial components in many sensing, imaging and emerging light based quantum communication applications. Such materials play an important role as polarizers, filters, wave-plates, phase-matching elements in photonic devices and circuits. Conventional crystalline materials with optical anisotropy typically show strong unidirectional linear dichroism over a broad wavelength range and even bandgap variations along different crystal directions. On the other hand, the linear dichroism conversion phenomenon -the orthogonal switch in the principle dichroism axis of the material across different optical wavelengthhas not been observed in crystalline materials. Here, we report the investigation of the unique linear dichroism conversion phenomenon in quasi-one-dimensional (quasi-1D) hexagonal perovskite chalcogenide BaTiS3. The material shows record level of optical anisotropy within the visible wavelength range. In contrast to conventional anisotropic optical materials, the linear dichroism polarity in BaTiS3 makes an orthogonal change at an optical wavelength corresponding to the photon energy of 1.78 eV. First principle calculations reveal that this anomalous linear dichroism conversion behavior originates from different selection rules of the optical transitions from the parallel bands in the BaTiS3 material. Wavelength dependent polarized Raman spectroscopy further confirms this phenomenon. Such material with linear dichroism conversion property can facilitate new ability to control and sense the energy, phase, and polarization of light, and lead to novel photonic devices such as polarization-wavelength selective detectors and lasers for multispectral imaging, sensing and optical communication applications.

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“…37,38 Here, the absorption coefficient data 39 are "matched" with the effective absorption using a proportionality constant (which is typically on the order of the pellet thickness times the loading). 40 A comparison of the absorption coefficient to the effective absorption spectrum can be used to render color by integrating the product of the spectrum with the well-known XYZ color matching functions to determine the XYZ color values.…”

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confidence: 99%

Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2
Cao
¹
,
Haraldsen
²
,
Rai
³

et al. 2006
Phys. Rev. B
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Magneto-optical investigation of the field-induced spin-glass insulator to ferromagnetic metallic transition of the bilayer manganite (La 0.4 We measured the magneto-optical response of (La0.4Pr0.6)1.2Sr1.8Mn2O7 in order to investigate the microscopic aspects of the magnetic field driven spin-glass insulator to ferromagnetic metal transition. Application of a magnetic field recovers the ferromagnetic state with an overall redshift of the electronic structure, growth of the bound carrier localization associated with ferromagnetic domains, development of a pseudogap, and softening of the Mn-O stretching and bending modes that indicate a structural change. We discuss field-and temperature-induced trends within the framework of the Tomioka-Tokura global electronic phase diagram picture and suggest that controlled disorder near a phase boundary can be used to tune the magnetodielectric response. Remnants of the spin-glass insulator to ferromagnetic metallic transition can also drive 300 K color changes in (La0.4Pr0.6)1.2Sr1.8Mn2O7.

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Method for the determination of the optical properties of highly conjugated pigments

Cited by 30 publications

References 13 publications

Non‐invasive Reflectance Spectroscopy for Normal and Cancerous Skin Cells Refractive Index Determination: An In Vitro Study

Non‐invasive Reflectance Spectroscopy for Normal and Cancerous Skin Cells Refractive Index Determination: An In Vitro Study

Linear Dichroism Conversion in Quasi‐1D Perovskite Chalcogenide

Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2
Cao
¹
,
Haraldsen
²
,
Rai
³

et al. 2006
Phys. Rev. B
Self Cite

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Method for the determination of the optical properties of highly conjugated pigments

Cited by 30 publications

References 13 publications

Non‐invasive Reflectance Spectroscopy for Normal and Cancerous Skin Cells Refractive Index Determination: An In Vitro Study

Non‐invasive Reflectance Spectroscopy for Normal and Cancerous Skin Cells Refractive Index Determination: An In Vitro Study

Linear Dichroism Conversion in Quasi‐1D Perovskite Chalcogenide

Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2Cao1, Haraldsen2, Rai3 et al. 2006Phys. Rev. BSelf Cite

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Magneto-optical investigation of the field-induced spin-glass-insulator to ferromagnetic-metal transition in the bilayer manganite(La0.4Pr0.6)1.2
Cao
¹
,
Haraldsen
²
,
Rai
³

et al. 2006
Phys. Rev. B
Self Cite