Nonlinear optical absorption in silver nanosol
K P UnnikrishnanInternational School of Photonics, Cochin University of Science & Technology, Cochin 682022, IndiaV. P. N. NampooriInternational School of Photonics, Cochin University of Science & Technology, Cochin 682022, IndiaV. RamakrishnanSchool of Physics, Madurai Kamaraj University, Madurai 625021, IndiaM UmadeviSchool of Physics, Madurai Kamaraj University, Madurai 625021, IndiaC. P. G. VallabhanInternational School of Photonics, Cochin University of Science & Technology, Cochin 682022, India
2003en
ABI
Аннотация
Nonlinear optical absorption in silver nanosol was investigated at selected wavelengths (456 nm, 477 nm and 532 nm) using open aperture Z-scan technique. It was observed that nature of nonlinear absorption is sensitively dependent on input fluence as well as on excitation wavelength. Besides, the present sample was found to exhibit reverse saturable absorption (RSA) and saturable absorption (SA) at these wavelengths depending on excitation fluence. RSA is attributed to enhanced absorption resulting from photochemical changes. SA observed for fluence values lower and higher than those corresponding to RSA are, respectively, attributed to plasmon bleach and saturation of RSA.
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