Three-photon absorption in ZnSe and ZnSe∕ZnS quantum dots

Lad, Amit D.; Kiran, P. Prem; Kumar, G. Ravindra; Mahamuni, Shailaja

doi:10.1063/1.2714994

Cited by 63 publications

(51 citation statements)

References 16 publications

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“…The open aperture Z-scan setup was similar to that used in Ref. 12. The laser beam was focused using a lens of 35 cm, giving the focal spot size of 57 m. The peak intensities incident on the sample were maintained between 8 and 30 GW/ cm 2 to avoid the damage.…”

Section: Two-photon Absorption In Znse and Znse/ Zns Core/shell Quantmentioning

confidence: 99%

Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures

Lad

Kiran

et al. 2008

Applied Physics Letters

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The third order nonlinear optical properties of two different sized ZnSe and ZnSe∕ZnS quantum dots (QDs) are investigated. The nonlinear absorption is measured at 806nm using Ti:sapphire 100fs laser pulses in an open aperture Z-scan setup. Two-photon absorption (2PA) is found to be dominant in core and core shell QDs. 2PA cross section is enhanced by three orders of magnitude compared bulk ZnSe. 2PA cross section is observed to increase with reduction in QD diameter, due to strong confinement effect. ZnSe∕ZnS QDs exhibit higher 2PA cross section compared with corresponding ZnSe QDs, indicating better passivation of the QD surface.

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Section: Two-photon Absorption In Znse and Znse/ Zns Core/shell Quantmentioning

confidence: 99%

Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures

Lad

Kiran

et al. 2008

Applied Physics Letters

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“…[13,14] This can be achieved by using graded shell quantum dot architectures. [15][16][17] When coupled with suitable microcavities, such as microring, spherical resonators, [18][19][20] distributed Bragg reflectors, [21] and distributed feedback (DFB), [22][23][24] the optical gain which stems from QDs can be exploited to develop prototype QD based microlasers.…”

Section: Introductionmentioning

confidence: 99%

Soft‐Lithographed Up‐Converted Distributed Feedback Visible Lasers Based on CdSe–CdZnS–ZnS Quantum Dots

Todescato

Fortunati

Gardin

et al. 2011

Adv Funct Materials

101

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The development of a solution-deposited up-converted distributed feedback laser prototype is presented. It employs a sol-gel silica/germania soft-lithographed microcavity and CdSe-CdZnS-ZnS quantum dot/sol-gel zirconia composites as optical gain material. Characterization of the linear and nonlinear optical properties of quantum dots establishes their high absorption cross-sections in the one-and two-photon absorption regimes to be 1 × 10 −14 cm 2 and 5 × 10 4 GM, respectively. In addition, ultrafast transient absorption dynamics measurements of the graded seal quantum dots reveal that the Auger recombination lifetime is 220 ps, a value two times higher than that of the corresponding CdSe core. These factors enable the use of such quantum dots as optically pumped gain media, operating in the one-and two-photon absorption regime. The incorporation of CdSe-CdZnSZnS quantum dots within a zirconia host matrix affords a quantum-dot ink that can be directly deposited on our soft-lithographed distributed feedback grating to form an all-solution-processed microcavity laser.

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“…Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles. © 2014 Author (s optical data storage, 3 and nonlinear optics [4][5][6][7] owing to their enhanced and tunable optical properties. In particular, near-infrared (NIR) plasmonic effects in semiconductor NPs are emerging as a subject of active research because of their potential applications in photonic devices.…”

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confidence: 99%

Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots

2014

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We report facile preparation of water dispersible CuS quantum dots (2–4 nm) and nanoparticles (5–11 nm) through a nontoxic, green, one-pot synthesis method. Optical and microstructural studies indicate the presence of surface states and defects (dislocations, stacking faults, and twins) in the quantum dots. The smaller crystallite size and quantum dot formation have significant effects on the high energy excitonic and low energy plasmonic absorption bands. Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles.

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Three-photon absorption in ZnSe and ZnSe∕ZnS quantum dots

Cited by 63 publications

References 16 publications

Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures

Two-photon absorption in ZnSe and ZnSe∕ZnS core/shell quantum structures

Soft‐Lithographed Up‐Converted Distributed Feedback Visible Lasers Based on CdSe–CdZnS–ZnS Quantum Dots

Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots

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