Ultrafast nonlinear optical processes and free-carrier lifetime in silicon nanowaveguides

2011 ◽  
Author(s):  
Ali R. Motamedi ◽  
Amir H. Nejadmalayeri ◽  
Anatol Khilo ◽  
Franz X. Kärtner ◽  
Erich P. Ippen
Keyword(s):  
Nonlinear Optical ◽  
Carrier Lifetime ◽  
Free Carrier

Contactless Spatially Resolved Measurement of Bulk Free-Carrier Lifetime in Silicon Ingots

1986 ◽  
Vol 69 ◽  
Author(s):  
S. M. Johnson ◽  
L. G. Johnson ◽  
R. Hemphill
Keyword(s):  
Spatial Dependence ◽  
Polycrystalline Silicon ◽  
Carrier Lifetime ◽  
Transient Absorption ◽  
Free Carrier ◽  
Large Area ◽  
Spatially Resolved ◽  
Probe Transmission ◽  
Transmission Measurements ◽  
Absorption Measurements

AbstractA contactless spatially resolved measurement of bulk free-carrier lifetime in polycrystalline silicon ingots was accomplished using optically modulated free-carrier infrared absorption. Using a CW Nd:YAG laser (λ = 1.319 μm) for a probe and novel pulsed, tunable, infrared dye laser (λ = 1.10 to 1.13 μm) with photon energies near the Si bandgap, for a pump, the free-carrier lifetime was determined from transient absorption measurements to a maximum depth of 3.0 cm from the surface of an ingot. The spatial dependence of the free-carrier lifetime and the distribution of precipitates (determined from infrared probe transmission measurements) measured along the growth axis of an ingot were found to be strongly related to the spatial dependence of the I–V characteristics of large area solar cells fabricated from the subsequently wafered ingot.

Effects of annealing silicon ion irradiated rib waveguides with respect to free carrier lifetime

2010 ◽  
Author(s):  
Nicholas M. Wright ◽  
Andrew J. Smith ◽  
Konstantin Litvinenko ◽  
Russell Gwilliam ◽  
Goran Mashanovich ◽  
...  
Keyword(s):  
Carrier Lifetime ◽  
Free Carrier ◽  
Rib Waveguides

scholarly journals Ultrafast Broadband Nonlinear Optical Response in Co-Doped Sb2Se3 Nanofilms at Near-Infrared

2021 ◽  
Vol 8 ◽  
Author(s):  
Di Sun ◽  
Yu Fang ◽  
Xiaoyan Yan ◽  
Wen Shan ◽  
Wenjun Sun ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Near Infrared ◽  
Optical Response ◽  
Free Carrier ◽  
Nonlinear Optical Response ◽  
Photon Absorption ◽  
Free Carrier Absorption ◽  
Ultrafast Carrier ◽  
Carrier Absorption ◽  
Co Doped

Transition metal-doped Sb2Se3 has become a heated topic caused by the strong nonlinear optical response and the ultrafast response time at high laser excitation. In this paper, the Co-doped Sb2Se3 with different doping amount (0.5, 1.0, and 1.5 W) nanofilms were prepared by magnetron sputtering technology, and the nonlinear behavior of Co-doped Sb2Se3 nanofilms at near infrared were systematically studied. The results of the femtosecond Z-Scan experiment indicate that the Co-doped Sb2Se3 nanofilms exhibit broadband nonlinear response properties owing to the free carrier absorption, the Kerr refraction, the two-photon absorption, and the free carrier refraction. The nonlinear absorption coefficients of Co-doped Sb2Se3 nanofilms are from 3.0 × 10−9 to 2.03 × 10−8 m/ W under excitation at 800, 980, and 1,030 nm, and the nonlinear refractive index of the Co-doped Sb2Se3 nanofilms is from 4.0 × 10−16 to -3.89 × 10−15 m2/ W at 800, 980, and 1,030 nm. More importantly, Co-doped Sb2Se3 (1.5 W) nanofilm exhibits ultrafast carrier absorption (<1 ps) and a stronger transient absorption intensity of ΔOD > 6.3. The Co-doping content can controllably tune the crystalline degree, the ultrafast carrier absorption, the intensity of the reverse saturation absorption, the broadband nonlinear optical response, and the carrier relaxation time of Co-doped Sb2Se3 nanofilms. These results are sufficient to support their applications in broadband nonlinear photonic devices.

Free carrier lifetime in high resistivity aluminium antimonide

1967 ◽  
Vol 5 (5) ◽  
pp. 395-397 ◽  
Author(s):  
Norma G. Blamires ◽  
P.E. Gibbons
Keyword(s):  
Carrier Lifetime ◽  
Free Carrier ◽  
High Resistivity

scholarly journals Ultrashort free-carrier lifetime in low-loss silicon nanowaveguides

2010 ◽  
Vol 18 (4) ◽  
pp. 3582 ◽  
Author(s):  
Amy C. Turner-Foster ◽  
Mark A. Foster ◽  
Jacob S. Levy ◽  
Carl B. Poitras ◽  
Reza Salem ◽  
...  
Keyword(s):  
Carrier Lifetime ◽  
Free Carrier ◽  
Low Loss
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