Sulphamic acid: potential single crystal for nonlinear optical applications

A bulk-sized single crystal of sulphamic acid (SA) was grown by the solution growth technique. The lattice dimensions and the plane’s identification of the grown crystal were confirmed with powder X-ray diffraction. High-resolution X-ray diffraction was employed to observe crystalline perfection that was found fairly good. The optical transmission studies reveal its suitability for optical applications in the complete UV–visible region of the electromagnetic spectrum. Bandgap calculations and other optical parameters like absorption and extinction coefficient were calculated to scrutinize its optical characteristics. The photoluminescence emission spectrum was recorded for the corresponding excitation wavelength to reveal the crystal behavior and energy gap transitions. The presence of the titled compound was examined through FTIR spectroscopy. Ellipsometry study was also carried out for the measurement of linear refractive index (n) and also for the extinction coefficient (K). Z-scan studies have been examined to reveal third-order nonlinear optical behavior and calculated the value of its nonlinear absorption coefficient (β). The Terahertz response of the grown crystal was analyzed by the terahertz time-domain spectroscopy. Observed results showed that SA crystal is a good aspirant for NLO applications.