Abstract
Optical spectra were investigated in a spectral range of (300 - 700) nm for CuAlS2 single crystals. Transmission and wavelength modulated transmission spectra demonstrated presence of some impurity absorption bands in the region of optical transparency of crystals. Optical functions (real and imaginary components of the dielectric function, refractive index and extinction coefficient) have been calculated from the optical reflection spectra by means of the Kramers-Kronig relations. A strong anisotropy and birefringence have been revealed for CuAlS2 crystals. Two isotropic points have been found in (100) oriented platelets around 380 nm and 530 nm. The position of the isotropic point around 530 nm was found to be strongly influenced by the technological conditions of crystal growth and platelet thickness, it being situated at 535 nm for a platelet with thickness of 223 µm. An optical band-pass filter was constructed with such a platelet placed between two Gran-Thompson prism crossed polarizers.
Highlights
AIIBVI compounds are widely used in electronic, optoelectronic and photonic devices [1, 2]
If the radiation with λ=λ0 wavelength propagates through a crystal, the energy transfer occurs from the mode polarized as no to the mode polarized as ne, i.e. the interaction of two orthogonally polarized modes is revealed in the crystal's isotropic point
The results of this study demonstrate that strong anisotropy of optical properties and birefringence is inherent to CuAlS2 single crystals
Summary
AIIBVI compounds are widely used in electronic, optoelectronic and photonic devices [1, 2]. AIBIIICVI2 compounds can be considered as an extension of the zincblende AIIBVI materials from the point of view of their crystal structure, they being an alternative stack of two zincblende cells with two cations AI and BIII instead of the AII cation. This results in a non-centro symmetrical structure with anisotropy of optical properties. Especial interest presents the birefringence inherent to these materials, making them suitable for the developments of optical filters [3 - 12], in addition to their use in solar cells [13 - 15], light-emitting devices [16, 17], photo catalysis [18, 19] and nonlinear optics [20]. The phase difference induced by birefringence is much larger as compared to the phase difference caused by optical activity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
