Centimeter-Scale Gold Nanoparticle Arrays for Spatial Mapping of the Second Harmonic and Two-Photon Luminescence

AbstractMulti-resonant plasmonic simple geometries like nanocylinders and nanorods are highly interesting for two-photon photoluminescence and second harmonic generation applications, due to their easy fabrication and reproducibility in comparison with complex multi-resonant systems like dimers or nanoclusters. We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode. We establish a method to separate experimentally the enhancement factor at the excitation and at the emission wavelengths for this double resonant system. The sensitivity of the spectral positions of the dipolar and quadrupolar plasmon resonances to the ellipticity of the nanocylinders and its impact on the two-photon photoluminescence enhancement are discussed.

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Nonlinear optical microscopies (NOMs) and plasmon-enhanced NOMs for biology and 2D materials

Nanophotonics ◽

10.1515/nanoph-2020-0082 ◽

2020 ◽

Vol 9 (6) ◽

pp. 1341-1358

Author(s):

Jialin Ma ◽

Mengtao Sun

Keyword(s):

Raman Scattering ◽

Nonlinear Optical ◽

Stimulated Raman Scattering ◽

Second Harmonic ◽

2D Materials ◽

Research Progress ◽

Two Photon ◽

Two Dimensional Materials ◽

Anti Stokes ◽

Physical Principles

AbstractIn this review, we focus on the summary of nonlinear optical microscopies (NOMs), which are stimulated Raman scattering (SRS), coherent anti-Stokes Raman scattering (CARS), second harmonic generation (SHG), and two-photon excited fluorescence (TPEF). The introduction is divided into two parts: the principle of SRS, CARS, TPEF, and SHG and their application to biology and two-dimensional materials. We also introduce the connections and differences between them. We also discuss the principle of plasmon-enhanced NOM and its application in the above two aspects. This paper not only summarizes the research progress in the frontier but also deepens the readers’ understanding of the physical principles of these NOMs.

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OPTICAL NONLINEARITY VIA PHONONS AS AN INTERMEDIARY

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863501000449 ◽

2001 ◽

Vol 10 (01) ◽

pp. 65-77 ◽

Cited By ~ 3

Author(s):

OU FA ◽

HE MINGGAO ◽

WU FUGEN

Keyword(s):

Second Harmonic ◽

Optical Nonlinearity ◽

Photon Absorption ◽

Saturation Phenomenon ◽

Sum Frequency ◽

Two Photon Absorption ◽

Two Photon ◽

Threshold Phenomenon ◽

Anti Stokes ◽

The Given

A new model to describe the origin of optical nonlinearity is presented. In this model, the interaction between light and medium is reduced to the coupling of photons with phonons, which occurs in the crystal lattice vibrating anharmonically. Then the optical nonlinearity originates from the nonlinear photon–phonon coupling or the interaction among phonons themselves. In this paper, more attention is drawn to the latter. By the given model, (1) degenerate and (2) nondegenerate parametric oscillations, (3) Stokes and (4) anti-Stokes Raman scattering, (5) sum-frequency and (6) second harmonic generation and (7) two-photon absorption are dealt with systematically and quantum-mechanically. The results of theoretical analysis show that the effects (1)–(4) are associated with threshold phenomenon, whereas the effects (5)–(7) with the saturation phenomenon.

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