χ(3) and optical power limiting measurements of Polyaniline and its derivative Poly (o-toluidine) under CW regime

S. Pramodini, P. Poornesh, Y. N. Sudhakar, M. Selva Kumar

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We present the synthesis and results on the third-order optical nonlinearity and optical limiting properties of Polyaniline and Poly (o-toluidine) studied in N,N-Dimethyl Formamide solution using a single-beam z-scan technique. Experiments were performed using continuous wave He-Ne laser operating at 633 nm wavelength as an excitation source. The samples exhibit absorption and refraction nonlinearities. The negative sign of the nonlinear refractive index n2 indicates that both materials exhibit self-defocusing optical nonlinearity. The nonlinear refractive index n 2, the nonlinear absorption coefficient βeff and the third-order optical susceptibility χ(3) were determined and found to be of the order of 10-7 cm2/W, 10-2 cm/W and 10-7 esu respectively. The FTIR and UV-visible characterization spectra confirm the expected molecular structure of the polymers. Multiple diffraction rings were observed when the samples were exposed to laser beam. The appearance of rings is due to the refractive index change and thermal lensing. The polymer samples with different concentrations exhibits strong optical power limiting under continuous wave laser at the experimental wavelength. Reverse saturable absorption is the dominating mechanism for the observed absorption nonlinearities.

Original languageEnglish
Pages (from-to)125-132
Number of pages8
JournalOptics Communications
Volume293
DOIs
Publication statusPublished - 15-04-2013

Fingerprint

2-toluidine
Polyaniline
Refractive index
nonlinearity
Derivatives
Polymers
refractivity
Dimethylformamide
Wavelength
Continuous wave lasers
Refraction
Molecular structure
Laser beams
thermal lensing
rings
continuous wave lasers
defocusing
polymers
Diffraction
wavelengths

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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χ(3) and optical power limiting measurements of Polyaniline and its derivative Poly (o-toluidine) under CW regime. / Pramodini, S.; Poornesh, P.; Sudhakar, Y. N.; Kumar, M. Selva.

In: Optics Communications, Vol. 293, 15.04.2013, p. 125-132.

Research output: Contribution to journalArticle

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T1 - χ(3) and optical power limiting measurements of Polyaniline and its derivative Poly (o-toluidine) under CW regime

AU - Pramodini, S.

AU - Poornesh, P.

AU - Sudhakar, Y. N.

AU - Kumar, M. Selva

PY - 2013/4/15

Y1 - 2013/4/15

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AB - We present the synthesis and results on the third-order optical nonlinearity and optical limiting properties of Polyaniline and Poly (o-toluidine) studied in N,N-Dimethyl Formamide solution using a single-beam z-scan technique. Experiments were performed using continuous wave He-Ne laser operating at 633 nm wavelength as an excitation source. The samples exhibit absorption and refraction nonlinearities. The negative sign of the nonlinear refractive index n2 indicates that both materials exhibit self-defocusing optical nonlinearity. The nonlinear refractive index n 2, the nonlinear absorption coefficient βeff and the third-order optical susceptibility χ(3) were determined and found to be of the order of 10-7 cm2/W, 10-2 cm/W and 10-7 esu respectively. The FTIR and UV-visible characterization spectra confirm the expected molecular structure of the polymers. Multiple diffraction rings were observed when the samples were exposed to laser beam. The appearance of rings is due to the refractive index change and thermal lensing. The polymer samples with different concentrations exhibits strong optical power limiting under continuous wave laser at the experimental wavelength. Reverse saturable absorption is the dominating mechanism for the observed absorption nonlinearities.

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