Synthesis growth and studies on optical, thermal and terahertz analyses of bulk size sodium acid phthalate single crysta
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Synthesis growth and studies on optical, thermal and terahertz analyses of bulk size sodium acid phthalate single crystal: a metal–organic material for nonlinear optical applications Manju Kumari1,2 · N. Vijayan2 · Debabrata Nayak1,2 · Mahak Vij1,2 · Pargam Vashishtha1,2 · Subhash Nimanpure1,2 · Govind Gupta2 · Mukesh Jewariya2 · R. P. Pant2 Received: 13 April 2020 / Accepted: 30 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Optical grade semi-organic single crystal of sodium acid phthalate (NaAP) was synthesized, and the crystals were harvested by slow evaporation solution growth technique (SEST) in an ambient condition. The titled compound is a promising material for nonlinear optical (NLO) applications and crystallized in non-centrosymmetric system. The structural information of the above-mentioned crystal was investigated by powder X-ray diffraction (PXRD), which reveals that it belongs to orthorhombic structure and B2ab space group. The presence of defects in the harvested crystal was assessed by high-resolution X-ray diffraction (HRXRD) and found that grown single crystal is moderately good. The optical behaviour of NaAP crystal was examined by UV–Vis, photoluminescence (PL) and time-resolved PL (TRPL), respectively. Thermal response and stability of the title compound were tested using thermogravimetry (TG), derivative thermogravimetry (DTG) and differential scanning calorimetry (DSC) analyses. The coefficient of thermal expansion (CTE) was evaluated using thermomechanical analyzer (TMA). The third-order NLO properties of NaAP single crystal had been evaluated by Z-scan method. The twophoton absorption coefficient (β) was calculated from open-aperture curve of Z-scan. The nonlinear study reveals that NaAP crystal is an appropriate choice in optical limiting usage. Terahertz (THz) time domain spectroscopy was used to study optical characteristics like refractive index and absorption coefficient of NaAP single crystal. Keywords Single crystal · Nonlinear · Thermal · Time-resolved PL · Z-scan · X-ray diffraction · Terahertz
Introduction NLO plays a significant role in optoelectronics and laser technology such as optical information processing, optical switching, optical communication and data storage [1–6]. Numerous organic and inorganic materials were used for the above said applications. In organic NLO materials, the molecules have usually bonded by weak Van der Waals and hydrogen bonds, and therefore, it is showing higher nonlinear optical susceptibilities in comparison with inorganic * N. Vijayan [email protected]; [email protected] 1
Academy of Scientific and Innovative Research (AcSIR), CSIR‑HRDC Campus, Ghaziabad, Uttar Pradesh 201002, India
Indian Reference Materials (BND) Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India
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counterparts. At the same, it is having lower mechanical, thermal stability with less laser damage threshold (LDT) [7]. But, the inorganic NLO compounds show admirable behaviour of thermal, mechanical but co
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