Optical limiting, nonlinear refraction and nonlinear absorption of the associates of Cd05Zn05S quantum dots and dyes

A novel dmit 2- complex: [( C 2 H 5)4 N][Co(dmit) 2], abbreviated as EtCo , was synthesized and its third-order optical nonlinearities were characterized by Z-scan technique at the wavelength of 1064 nm with laser duration of 40 ps. Z-scan curves revealed a negative nonlinear refraction at 1064 nm and a positive absorption was observed. The nonlinear refraction coefficient n2, the nonlinear absorption coefficient β and the molecular second hyperpolarizability γ have been determined to be as large as 9.51×10-19 m 2/ W , 2.19×10-12 m/W and 5.41×10-31 esu respectively, suggesting that this material has potential applications in optical limiting.

Download Full-text

Nonlinear refraction, nonlinear absorption, and optical limiting in BSO and BGO photorefractive crystals

10.1117/12.540654 ◽

2004 ◽

Cited By ~ 1

Author(s):

Aleksandr I. Ryasnyanskiy

Keyword(s):

Nonlinear Absorption ◽

Nonlinear Refraction ◽

Optical Limiting ◽

Photorefractive Crystals

Download Full-text

Protonation effect on the nonlinear absorption, nonlinear refraction and optical limiting properties of tetraphenylporphyrin

Optoelectronics Letters ◽

10.1007/s11801-019-8157-7 ◽

2019 ◽

Vol 15 (2) ◽

pp. 135-138 ◽

Cited By ~ 1

Author(s):

Xiao-liang Zhang ◽

Xiao-hong Chen

Keyword(s):

Nonlinear Absorption ◽

Nonlinear Refraction ◽

Optical Limiting ◽

Protonation Effect

Download Full-text

Nonlinear Absorption and Refraction of Picosecond and Femtosecond Pulses in HgTe Quantum Dot Films

Nanomaterials ◽

10.3390/nano11123351 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3351

Author(s):

Arturs Bundulis ◽

Ivan A. Shuklov ◽

Vyacheslav V. Kim ◽

Alaa A. Mardini ◽

Jurgis Grube ◽

...

Keyword(s):

Quantum Dots ◽

Nonlinear Absorption ◽

Nonlinear Refraction ◽

Tunable Laser ◽

Laser Pulses ◽

Ultrashort Laser Pulses ◽

Saturable Absorption ◽

Femtosecond Pulses ◽

Laser Mode ◽

Ultrashort Laser

We report measurements of the saturated intensities, saturable absorption, and nonlinear refraction in 70-nm thick films containing 4 nm HgTe quantum dots. We demonstrate strong nonlinear refraction and saturable absorption in the thin films using tunable picosecond and femtosecond pulses. Studies were carried out using tunable laser pulses in the range of 400–1100 nm. A significant variation of the nonlinear refraction along this spectral range was demonstrated. The maximal values of the nonlinear absorption coefficients and nonlinear refractive indices determined within the studied wavelength range were −2.4 × 10−5 cm2 W−1 (in the case of 28 ps, 700 nm probe pulses) and −3 × 10−9 cm2 W−1 (in the case of 28 ps, 400 nm probe pulses), respectively. Our studies show that HgTe quantum dots can be used in different fields e.g., as efficient emitters of high-order harmonics of ultrashort laser pulses or as laser mode-lockers.

Download Full-text

Nonlinear refraction and nonlinear absorption of CdSe0.3S0.7/ZnS quantum dots

Physica E Low-dimensional Systems and Nanostructures ◽

10.1016/j.physe.2012.01.003 ◽

2012 ◽

Vol 44 (7-8) ◽

pp. 1158-1161 ◽

Cited By ~ 8

Author(s):

Feng Wu ◽

Aihua Liu ◽

Hong Zheng ◽

Haitao Chang ◽

Peng Shi ◽

...

Keyword(s):

Quantum Dots ◽

Nonlinear Absorption ◽

Nonlinear Refraction

Download Full-text

BIEXCITONIC EFFECT ON TRANSIENT NONLINEAR REFRACTION AND ABSORPTION IN A MAGNETIZED CdS QUANTUM DOTS

International Journal of Nanoscience ◽

10.1142/s0219581x11009143 ◽

2011 ◽

Vol 10 (04n05) ◽

pp. 675-679 ◽

Cited By ~ 1

Author(s):

SWATI GOYAL ◽

PRANAY K. SEN

Keyword(s):

Magnetic Field ◽

Quantum Dots ◽

Nonlinear Absorption ◽

Perturbation Technique ◽

Nonlinear Refraction ◽

Fundamental Absorption Edge ◽

Exciton State ◽

Magnetic Field Effects ◽

Cds Quantum Dots ◽

Nonlinear Optical Susceptibility

Transient optical nonlinearities of semiconductor quantum dots in the strongly confined regime are studied, in which the exciton, biexciton and magnetic field effects are taken into account. The photo induced band-to-band electronic transitions are considered from both the heavy-hole (hh) and light-hole (lh) valence bands to the lowest (1s) exciton state below the fundamental absorption edge. The time dependent perturbation technique for a three-level system, under the near band gap resonant excitation regime, has been employed; with the incorporation of the relaxation and dephasing mechanisms phenomenologically. The induced polarization is calculated from where the real and imaginary parts of the third-order nonlinear optical susceptibility, responsible for the occurrence of nonlinear refraction and nonlinear absorption respectively, have been derived. The temporal and detuning spectra of nonlinear refraction and absorption; and their dependence on density of biexcitons and a moderately strong magnetic field, have been analyzed. It is observed that the nonlinear refraction and nonlinear absorption enhance with increasing magnetic field in small CdS quantum dots.

Download Full-text