The role of chiral local field enhancements below the resolution limit of Second Harmonic Generation microscopy

Valev, Ventsislav K.; Clercq, Ben De; Zheng, Xuezhi; Denkova, Denitza; Osley, Ej J.; Vandendriessche, Stefaan; Silhanek, Alejandro; Volskiy, Vladimir; Warburton, PA; Vandenbosch, G.A.E.; Ameloot, Marcel; Moshchalkov, Victor; Verbiest, Thierry

doi:10.1364/oe.20.000256

Cited by 34 publications

(41 citation statements)

References 51 publications

(54 reference statements)

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“…The generated heat can go beyond the melting point and finally decorates the optical response of the structure. Similar simulation-experiment comparisoncan be found in [26][27][28][29][30][31].…”

Section: Volume Integral Equation Formulation and Volumetric Methods Osupporting

confidence: 79%

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Zheng

Vandenbosch²,

Moshchalkov³

2017

Nanoplasmonics - Fundamentals and Applications

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This chapter focuses on understanding the electromagnetic response of nanoscopic metallic antennas through a classical computational electromagnetic algorithm: volumetric method of moments (V-MoMs). Under the assumption that metals only respond to external electromagnetic disturbance locally, we rigorously formulate the light-nanoantenna interaction in terms of a volume integral equation (VIE) and solve the equation by using the method of moments algorithm. Modes of a nanoantenna, as the excitation independent solution to the volume integral equation (VIE), are introduced to resolve the antenna's complex optical spectrum. Group representation theory is then employed to reveal how the symmetry of a nanoantenna defines the modes' properties and determines the antenna's optical response. Through such a treatment, a set of tools that can systematically treat the interaction of light with a nanoantenna is developed, paving the road for future nanoantenna design.

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Section: Volume Integral Equation Formulation and Volumetric Methods Osupporting

confidence: 79%

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Zheng

Vandenbosch²,

Moshchalkov³

2017

Nanoplasmonics - Fundamentals and Applications

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“…[139][140][141][142] For example, the chirality of plasmonic excitations on gold nanostructures was studied based on a farfield second-harmonic imaging method with circularly polarised light (Fig. 16).…”

Section: Methods Of Near-field Measurements Of Local Optical Activitymentioning

confidence: 99%

Local optical responses of plasmon resonances visualised by near-field optical imaging

Okamoto

Narushima

Nishiyama

et al. 2015

Phys. Chem. Chem. Phys.

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The unique optical characteristics of noble metal nanostructures have their origin principally in surface plasmon resonances. To exploit and design the unique characteristics arising from plasmons, an investigation of optical field structures adjacent to the nanostructure is of fundamental importance. As the spatial scale of the optical field structures is essentially smaller than the radiation wavelength in resonance with the plasmon, optical imaging methods that achieve spatial resolution beyond the diffraction limit of light are necessary to visualise the fields. In this article, we review the studies of direct experimental visualisation of plasmon resonances using near-field optical microscopy. We briefly describe the method of near-field optical microscopy used to study noble metal nanoparticles and show with several typical single gold nanoparticles that the spatial features of plasmon resonances, in particular the standing wave functions of the plasmons, can be directly visualised by near-field imaging. We then describe our recent efforts to visualise ultrafast dynamics in metal nanostructures following plasmonic excitation, which are based on near-field ultrafast imaging measurements. Another notable aspect of metal nanostructures that has attracted attention recently is the chirality of plasmons. Here, we describe a method and examples of near-field optical imaging and analyses of chiral plasmons excited on metal nanostructures.

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“…23,25,27 Previous research demonstrated the enhanced spatial resolution for both SHG and TPL imaging because of their nonlinear dependence upon the excitation power, 38,39 while the resolution of linear scattering was restricted to the diffraction limit. 40 To determine the spatial resolution of this multimodal optical microscopy experimentally, the gold nanorods were imaged by SHG, TPL, and RLS, respectively.…”

Section: Spatial Resolution Of Multimodal Optical Microscopymentioning

confidence: 99%

“…Notably, the resolutions of SHG, TPL, and RLS were comparable to or even much higher than those reported in the previous researches. 23,38,43 For example, the resolution of SHG was 200 nm for the imaging of star-shaped golds, 38 the resolution of TPL was 300 nm for the imaging of blood vessels, 23 and the Rayleigh scattering displayed submicrometer resolution for the imaging of single-walled carbon nanotubes. 43 The high spatial resolution of this multimodal optical microscopy offered great promise for further applications in biological and biomedical research.…”

Section: Spatial Resolution Of Multimodal Optical Microscopymentioning

confidence: 99%

Multimodal optical microscopy in combination with gold nanorods for cancer cell imaging

Cao

Chen

et al. 2012

J. Biomed. Opt

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Abstract. The multimodal optical imaging technique, which utilizes nonlinear and linear optical processes, plays an important role in biological and biomedical research. As second-order nonlinear phenomenon, the two-photon luminescence (TPL) results from the nonlinear excitation of fluorescent molecules, while the second harmonic generation (SHG) depends on the second order nonlinear polarization, orientation, and noncentrosymmetric properties of molecules. In contrast, the linear resonance light scattering (RLS) occurs when the molecules are excited by a light beam with a wavelength close to their absorption bands. Since SHG, TPL, and RLS involve different kinds of optical processes, they might be used in parallel to provide complementary information about the structure and function of cells and tissues. Herein, we develop for the first time a multimodal optical microscopy with the capability of simultaneous SHG, TPL, and RLS imaging. We analyze theoretically and demonstrate experimentally the near-infrared irradiation-induced SHG, TPL, and RLS from the gold nanorods with nanometer spatial resolution. With the gold nanorods as the contrast agents, we further demonstrate the simultaneous SHG, TPL, and RLS imaging of A431 human epithelial skin cancer cells. This multimodal optical microscopy might provide a reliable and complementary approach for biological and biomedical research.

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The role of chiral local field enhancements below the resolution limit of Second Harmonic Generation microscopy

Cited by 34 publications

References 51 publications

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Understanding the Physical Behavior of Plasmonic Antennas Through Computational Electromagnetics

Local optical responses of plasmon resonances visualised by near-field optical imaging

Multimodal optical microscopy in combination with gold nanorods for cancer cell imaging

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