Guiding light with singular beams in nanoplasmonic colloids

Ortega, A. Balbuena; Torres-González, F. E.; Gayou, V. L.; Delgado-Macuil, R.; Sakamoto, Junichi; Arzola, Alejandro V.; Assanto, Gaetano; Volke‐Sepúlveda, Karen

doi:10.1063/5.0041198

Cited by 9 publications

(10 citation statements)

References 45 publications

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“…It should be stressed that optical trapping forces, playing an important role in the nonlinear properties of other nanocolloids [5,25], are negligible in the present kind of samples [14][15][16]), owing to the dominant opto-thermal effect and the reduced size of the nanoparticles in the BGN; optical trapping on small particles, in fact, tends to be proportional to their volume [55].…”

Section: Nonlinearity: Z-scan Analysismentioning

confidence: 79%

“…In this paper, extending and completing our initial investigation [16], we report on propagation and guiding of various dark-cored CW singular beams through a colloidal suspension of gold nanoparticles exhibiting a repulsive, polarization-independent, nonlinearity. The latter stems from the opto-thermal response associated with linear absorption of the laser light (532 nm) near a plasmonic resonance.…”

Section: Introductionmentioning

confidence: 77%

“…In particular, the probe size reduced to one fifth in m = 1 BV's (i.e., structures with the smallest core), while it reduced to about 40% in m = 3 BC's (with the widest core). We stress that the nonlinear response of the red probe was too weak to affect the pump-induced waveguide in the explored power range [16]. The probe evolution along the cell was monitored with the aid of VS2, imaging the light scattered on the side.…”

Section: Resultsmentioning

confidence: 99%

“…Light-induced incoherent confinement was examined with a pump-probe scheme, collinearly injecting a weaker Gaussian beam of wavelength 632.8 nm in the dark region of each singular beam. At variance with earlier reports [16], we also analyze the role of the winding number in the formation of solitons and waveguides with these complex wavepackets.…”

Section: Introductionmentioning

confidence: 96%

“…A few applications of metallic nanocolloids in photonics exploit their nonlinear optical response, which entails, for instance, the generation of self-confined wavepackets [5,6,[11][12][13][14][15][16]. Since the Kerr-like (cubic) optical nonlinearity of nanocolloids can be either positive (focusing) or negative (defocusing) depending on the NP size and the wavelength of light, the generation of bright or dark spatial solitons has been pursued with them, as well, using pulsed or continuous-wave (CW) excitations [5,13].…”

Section: Introductionmentioning

confidence: 99%

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Light Confinement with Structured Beams in Gold Nanoparticle Suspensions

et al. 2021

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We carry out an experimental campaign to investigate the nonlinear self-defocusing propagation of singular light beams with various complex structures of phase and intensity in a colloidal suspension of gold nanoparticles with a plasmonic resonance near the laser wavelength (532nm). Studying optical vortices embedded in Gaussian beams, Bessel vortices and Bessel-cosine (necklace) beams, we gather evidence that while intense vortices turn into two-dimensional dark solitons, all structured wavepackets are able to guide a weak Gaussian probe of different wavelength (632.8 nm) along the dark core. The probe confinement also depends on the topological charge of the singular pump.

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Section: Nonlinearity: Z-scan Analysismentioning

confidence: 79%

Section: Introductionmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Light Confinement with Structured Beams in Gold Nanoparticle Suspensions

et al. 2021

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Nonlinear Propagation of Laser Light in Plasmonic Nanocomposites

Agiotis

Meunier

2022

Laser & Photonics Reviews

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Plasmonic nanocomposites have been extensively studied for over 3 decades. According to early theoretical studies, a large enhancement of nonlinear response has been predicted. Nonetheless, the promised enhancement of coherent or Kerr-type nonlinearities incurs major limitations related to strong absorption and saturation effects. Accordingly, diffraction-limited interactions and long-scale propagation in ultrafast timescales are undermined despite nanoscale-localized electronic field enhancement. Seemingly only nanometric devices operating at low intensity regimes are benefitted from the foresaid effect. Nonetheless, numerous studies have still exploited configurable properties of the nonlinear response of plasmonic nanocomposites, such as nonlinear absorption, high-order nonlinearities, and diffusive nonlinearities for the development of novel processes within the framework of nonlinear wave propagation described by effective medium properties. In this review, the most recent developments on the understanding of the nonlinear response of metals and plasmonic nanocomposites in various temporal regimes are presented. Furthermore, a synthesis of their experimentally determined third-order properties obtained by various experimental techniques, along with practical considerations, is provided. Computational models used for the formulation of nonlinear wave propagation in plasmonic nanocomposites are subsequently presented, corresponding to applicable concepts. Most recent related applications are concisely summarized, indicating the directions of increasing interest in the field, and outlining shortcomings.

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Conservation of orbital angular momentum and polarization through biological waveguides

Pérez

Preece

Wilson

et al. 2022

Sci Rep

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A major roadblock to the development of photonic sensors is the scattering associated with many biological systems. We show the conservation of photonic states through optically self-arranged biological waveguides, for the first time, which can be implemented to transmit light through scattering media. The conservation of optical properties of light through biological waveguides allows for the transmission of high bandwidth information with low loss through scattering media. Here, we experimentally demonstrate the conservation of polarization state and orbital angular momentum of light through a self-arranged biological waveguide, several centimeters long, in a sheep red blood cell suspension. We utilize nonlinear optical effects to self-trap cells, which form waveguides at 532 nm and 780 nm wavelengths. Moreover, we use the formed waveguide channels to couple and guide probe beams without altering the information. The formed biological waveguides are in a sub-diffusive scattering regime, so the photons’ information degrades insignificantly over several centimeters of propagation through the scattering media. Our results show the potential of biological waveguides as a methodology for the development of novel photonic biosensors, biomedical devices that require optical wireless communication, and the development of new approaches to noninvasive biomedical imaging.

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Guiding light with singular beams in nanoplasmonic colloids

Cited by 9 publications

References 45 publications

Light Confinement with Structured Beams in Gold Nanoparticle Suspensions

Light Confinement with Structured Beams in Gold Nanoparticle Suspensions

Nonlinear Propagation of Laser Light in Plasmonic Nanocomposites

Conservation of orbital angular momentum and polarization through biological waveguides

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