Refractive indices of Sn2P2S6 at visible and infrared wavelengths

Haertle, D.; Guarino, Andrea; Hajfler, Jaroslav; Montemezzani, Germano; Günter, Peter

doi:10.1364/opex.13.002047

Cited by 45 publications

(36 citation statements)

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“…For the room temperature and 632.8 nm λ = , their plane of optic axes is parallel to the b axis and is rotated by 45°∼ with respect to the a and c axes (see [16]). Under the same conditions, the angle between the optic axes is equal to 90°∼…”

Section: Methodsmentioning

confidence: 99%

Optical activity of Sn2P2S6 crystals at the phase transition

Vlokh¹,

Mys²,

Grabar³

et al. 2008

Ukr. J. Phys. Opt.

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Section: Methodsmentioning

confidence: 99%

Optical activity of Sn2P2S6 crystals at the phase transition

Vlokh¹,

Mys²,

Grabar³

et al. 2008

Ukr. J. Phys. Opt.

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“…In all the experiments the contribution of the reflections between the substrate and the Sn 2 P 2 S 6 plate were taken into account as well as multiple Fresnel reflections in the crystal itself. We used the recently determined twooscillator Sellmeier parameters for the refractive indices of Sn 2 P 2 S 6 [25]. The results of the transmission measurement with the laser lines are given in Table 1 and Fig.…”

Section: 1mentioning

confidence: 99%

Determination of the absorption constant in the interband region by photocurrent measurements

et al. 2006

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We determined high absorption constants of crystals from photocurrent measurements within the interband absorption region (10-10 4 cm −1 ). The method has been demonstrated in the interband absorption regime near 530 nm in Sn 2 P 2 S 6 , a novel infrared sensitive photorefractive material, and in the interband absorption regime near 257 nm of near stoichiometric LiTaO 3 . Besides the verification of older measurements with our new technique, precise absorption data for Sn 2 P 2 S 6 in the wavelength range 488-514 nm are presented. Light emitting diodes, photodetectors, electroabsorption modulators [1], solar cells and many other photonic devices involve transitions of charges between bands, and thus work in a region of high light absorption. Also holographic applications based on the interband photorefractive effect such as multiple quantum well devices [2,3], incoherent-to-coherent optical converters [4], light-induced waveguides [5], high-frame-rate joint Fourier-transform correlators [6] and dynamically reconfigurable wavelength filters [7], operate beyond the absorption edge with absorption constants up to 10 3 cm −1 . In this region, the absorption constant is not easily measured, but is nevertheless of crucial importance for the underlying basic physical mechanisms and the applications.The most common technique for measuring absorption constants in the order of 10-10 4 cm −1 is a direct measurement of the transmission of a thin sample. This method is quite precise but often requires a thin plate of only a few µm thickness.If the light at the wavelength of interest induces a secondary physical effect, it is possible to determine the absorption constant indirectly by a scanning method. For example,

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“…It is troublesome to obtain the tensor elements from experiment measurements 7–9 . If absorption is low enough to be negligible, the dielectric tensor ε ( ω ) is considered as a real symmetric one and can be diagonalized 10,11 . In this case, the orientation of principal axis system is frequency dispersive.…”

Section: Introductionmentioning

confidence: 99%

Propagation of terahertz waves in a monoclinic crystal BaGa4Se7

Yiwen

Yao

Wang

2018

Sci Rep

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The complex symmetric dielectric tensor of a monoclinic crystal cannot be diagonalized by a space rotation operation in general, which poses a serious difficulty in analyzing the propagation of electromagnetic fields in monoclinic crystals so far. This propagation issue is discussed in a general case without using the index ellipsoid scheme. It is found that, when incident waves travel along the mirror plane normal or 2-fold rotation axis of monoclinic crystals, two eigenmodes following specific dispersion relations are elliptically polarized with the same ellipticity and chirality but have spatially orthogonal elliptical principal axes. The frequency independent features are the unique manifestation of the crystal symmetry. Using polarization sensitive terahertz time-domain spectroscopy and our developed data analyzing and processing methods, three complex permittivity tensor elements for a monoclinic crystal BaGa4Se7 are straightforwardly extracted and the properties of the two eigenmodes are characterized in full. It is also interesting that the spectral components beyond 1.7 THz show a very high refraction index (>10) and low dissipation during propagation, which suggests that the bulk phonon-polariton waves may be excited and effectively propagate in the crystal, resulting from the coherent phonon excitations by the incident terahertz waves. Our results may promote to develop novel terahertz devices based on polariton excitation and propagation in monoclinic crystals.

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Refractive indices of Sn2P2S6 at visible and infrared wavelengths

Cited by 45 publications

References 0 publications

Optical activity of Sn2P2S6 crystals at the phase transition

Optical activity of Sn2P2S6 crystals at the phase transition

Determination of the absorption constant in the interband region by photocurrent measurements

Propagation of terahertz waves in a monoclinic crystal BaGa4Se7

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