Transition from saturable absorption to reverse saturable absorption of carmoisine dye under low-powered continuous wave laser excitation

Abdullah, M. and Bakhtiar, Hazri and Krishnan, Ganesan and Aziz, Muhammad Safwan and Danial, Wan Hazman and Islam, Shumaila (2019) Transition from saturable absorption to reverse saturable absorption of carmoisine dye under low-powered continuous wave laser excitation. Optics and Laser Technology, 115. pp. 97-103. ISSN 0030-3992

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Abstract

Unique nonlinear optics (NLO) properties i.e. intensity-dependent nonlinear absorption and refraction of carmoisine (food dye) is studied using a single beam z-scan technique. A switchover behavior from a saturable absorption (SA) to reverse saturable absorption (RSA) is observed by increasing concentration of carmoisine dye. The flip in the absorption response is attributed to the aggregated dye molecules under intense laser beam, which induces the formation of carmoisine dimers. In the UV–Vis absorption analysis, the appearance of two bands at higher concentration confirms the formation of carmoisine dimers. Fourier transform infrared spectroscopy (FTIR) suggests the intermolecular charge transfer (ICT) within the naphtyl-azo bonds. Huge magnitude of χ(3) is calculated in the order of 10−5 esu due to ICT process within the dye molecules. Optical limiting (OL) behavior is observed with low OL action threshold ∼0.01 kW/cm2 under continuous wave laser beam. The experimental findings shows that carmoisine dye has potential as an optical material for photonics applications such as an optical limiter under low-powered continuous wave laser.

Item Type:	Article (Journal)
Additional Information:	8124/76353
Uncontrolled Keywords:	Carmoisine; Optical limiter; Optical switching; Z-scan technique FTIR
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Chemistry
Depositing User:	Engku Norulizati Engku Aziz
Date Deposited:	28 Nov 2019 10:08
Last Modified:	08 Jan 2020 15:41
URI:	http://irep.iium.edu.my/id/eprint/76353

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