Abstract
We present the results of characterization of linear absorption and nonlinear refractive index of Au and Ag nanoclusters made by MeV ion implantation into LiNbO3. Ag was implanted at 1.5 MeV to fluences of 2 to 17 × 1016/cm2 at room temperature. Au was implanted to fluences of 5-20 × 1016/cm2 at an energy of 2.0 MeV. Optical absorption spectrometry indicated an absorption peak at 560 nm for the Au implanted samples after a 30 min heat treatment at 500°C in air. The peak shifted to ∼620 nm after heat treatment at 1000°C. The Ag implanted samples had absorption peaks at 445-485 nm before heat treatment. After 500°C heat treatment for 1 h the peaks decreased in height and shifted from 545 to 560 nm. Heat treatment at 800°C was sufficient to return the Ag implanted crystals to a clear state. The size of the clusters was determined from the absorption peaks. The Ag clusters did not change appreciably in size with heat treatment. The Au clusters increased from 1 to 3 nm upon heat treatment at 1000°C. Measurements of the nonlinear refractive indices were carried out using the z-scan method with a tunable dye laser pumped by a frequency doubled modelocked Nd:YAG laser. The dye laser had a 4.5 ps pulse duration time and 76 MHz pulse repetition rate (575 nm).
Original language | English |
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Pages (from-to) | 268-273 |
Number of pages | 6 |
Journal | Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms |
Volume | 141 |
Issue number | 1-4 |
DOIs | |
State | Published - May 1998 |
Keywords
- Ion implantation
- LiNbO
- Nanoclusters
- z-scan