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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2006. V. 9, N 2. P. 045-048.
Third order nonlinear optical response of PbS quantum dots
Department of Physics, Tezpur University, Napaam, Tezpur, Assam-784 028, India
∗
Corresponding author: e-mail: sky@tezu.ernet.in
Phone: +91-3712-231049
Abstract. PbS quantum dots of the average size 10 nm are synthesized in the polymer
matrix (PVA) following chemical route. Optical absorption spectra reveal a large blue
shift from the bulk absorption cutoff wavelength. Instead of using a high power laser, we
have measured for the first time the third order nonlinear susceptibility (χ 3 ) of PbS
quantum dots using a low power continuous wave laser with the Degenerate Four Wave
Mixing (DFWM) technique. The result is encouraging in nonlinear optical application at
room temperature.
Keywords: quantum dots, third order nonlinear susceptibility, DFWM.
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