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Optical Limiting Studies of Organic Semiconductor Molecule with Carbon Nanotube Addition
1Center for Tropicalization (CENTROP), National Defence University of Malaysia, Kem Sungai Besi, 57000, Kuala Lumpur, Malaysia
2Institute of Nano Optoelectronics Research and Technology (INOR), Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
3Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR), Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
4Center for Defence Foundation Studies, National Defence University of Malaysia, Kem Sungai Besi, 57000, Kuala Lumpur, Malaysia
5Faculty Defence Science and Technology, National Defence University of Malaysia, Kem Sungai Besi, 57000, Kuala Lumpur, Malaysia
*Email Address : zulaikha@upnm.edu.my
Abstract : Recent interest in thiophene-based molecules for nonlinear optics (NLO) and optical limiting studies is due to their good solution processability and optical modulation. In order to overcome weakness of thiophene based optical limiter at 532 nm wavelength, versatile carbon nanotubes (CNT) are introduced into the freeform thiophene solution. This paper investigated the role of multi-walled carbon nanotubes (MWCNT) addition in thiophene’s third-order NLO characteristics at 532 nm cw laser as equal weight ratios composite. CNT is chosen because of its broadband NLO property, unique structural and electronic properties, and tackling CNTs’ dispersion instability can optimize its full potential in photonics and laser applications. Prior to the optical limiting measurement, surface interactions between both materials were analyzed using UV-vis and Raman spectra. Significant improvement of optical limiting at 532 nm was discussed using nonlinear refraction (n2) and absorption (β) obtained from open and closed apertur
Keywords : thiophene, carbon nanotubes, dispersion, 532 nm cw, third-order NLO