Third order nonlinear optical properties of the PLD semi-transparent
5.5 Conclusions
Cu thin films Table 5.2: List of linear and nonlinear optical constants of Cu thin metal film.
Deposition time (minutes)
Average particle size (nm)
Linear absorption (α
cm-1) × 105
no (at 632.8
nm)
NLA coefficient (βcm/W)
NLA coefficient (n2cm2/W) ×
10-4
5 12 1.56 2.85 11.03±2.10
(RSA)
1.71±0.22
6 14 2.34 2.48 44.94±4.88 (SA) 1.81±0.28
7 16 2.20 2.30 68.94±8.67 (SA) 2.63±0.39
8 23 2.28 2.35 62.33±8.19 (SA) 4.28±0.58
9 23 2.17 2.27 61.62±6.53 (SA) 4.53±0.56
10 26 2.50 2.38 26.47±3.50 (SA) 3.35±0.40
All the Cu films deposited at 400°C exhibited self-focusing behaviour corresponding to positive n2. The n2 of Cu thin films was increased from 1.71×10−4 to 4.54×10−4 cm2/W with the size of the nanoparticles from 12 to 23 nm, but for larger sized nanoparticles 26 nm, it was decreased slightly to 3.35 × 10−4 cm2/W as shown in figure 5.7.
Cu thin films positive nonlinear refractive index coefficient. The value of n2 was of the order of ~10-4 cm2/W in all the cases. The gradual annealed film didn’t display any NLA. The films deposited directly at 400ºC showed both NLA and NLR. In this case, NLA coefficient increases with the particle size initially, attain a maximum value of 68.94 cm/W for a particle size of ~16 nm and then it falls down with further increases in particle size.
Cu thin films
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