Spatiotemporal control of femtosecond plasmon using plasmon response functions measured by near-field scanning optical microscopy (NSOM)

Onishi, Shutaro; Matsuishi, Keiichiro; Oi, Jun; Harada, Takuya; Kusaba, Miyuki; Hirosawa, Kenichi; Kannari, Fumihiko

doi:10.1364/oe.21.026631

Cited by 25 publications

(24 citation statements)

References 12 publications

(13 reference statements)

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“…(Bottom) Time histories of plasmon pulses measured at the three exits of the waveguide. The excitation laser pulse was shaped so that the Fourier transform limited plasmon appears at (a) Exit 1, (b) Exit 2, and (3) Exit 3 108. Reproduced with permission from Ref 108…”

mentioning

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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mentioning

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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“…8 In this study, when the reference pulse is characterized in advance, we employed cross-correlation measurement to obtain the characteristics of SPP pulses excited by femtosecond laser pulses in both the phase and amplitude without any nonlinear optics.…”

Section: Cross-correlation Measurement To Deduce Plasmon Responsementioning

confidence: 99%

“…The spatial resolution depends on the measurement scheme. When applying a NSOM, 8 we can obtain a response function with a spatial resolution smaller than the diffraction limit. With dark-field microscopy with a conventional optical imaging setup, the spatial resolution is limited by the diffraction limit.…”

Section: Cross-correlation Measurement To Deduce Plasmon Responsementioning

confidence: 99%

“…Onishi et al experimentally measured the plasmon response function at Au nanostructures with spectral interferometry (SI) combined with NSOM and demonstrated deterministic spatiotemporal control of the plasmon distribution based on the measured plasmon response function. 8 In this paper, we employed a cross-correlation dark-field image microscope to analyze the SPP characteristics coupled on an Au metal taper excited by femtosecond laser pulses. SPP's plasmon response function can be obtained that is associated with coupling at a grating structure by an incident light, propagation in a conical taper tip, and re-emission at the apex of the tip.…”

Section: Introductionmentioning

confidence: 99%

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Control of grating-coupled ultrafast surface plasmon pulse and its nonlinear emission by shaping femtosecond laser pulse

Toma

Masaki

Kusaba

et al. 2015

Journal of Applied Physics

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Spatiotemporal nanofocusing of ultrafast surface plasmon polaritons (SPPs) coupled on a metal Au tapered tip with a curvature radius of a few tens of nanometers is deterministically controlled based on the measured plasmon response function. We control the SPP pulse shape and the second harmonic generation at the apex of the Au tapered tip by shaping the excitation femtosecond laser pulses based on the response function. We also adapted a similar control scheme for coherent anti-Stokes Raman scattering (CARS) and achieved selective CARS excitation of a single Raman mode of carbon nanotubes with only a single excitation laser pulse at the apex of the tip.

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“…In these applications, a variety of structural geometries have been used in order to achieve desired functionalities. Most of the structures adopt symmetric ones such as spherical nanoparticles [12][13][14], nanorod [15,16], bowtie antenna [10,17], as well as some 'multi-branched nanostructure,' e.g., nanostar [11,[18][19][20] and nanocross [21][22][23][24][25]. As the geometrical characteristics of those structures, they can support complicated LSPR spectral features and thus get much attention.…”

Section: Introductionmentioning

confidence: 99%

Features of Local Electric Field Excitation in Asymmetric Nanocross Illuminated by Ultrafast Laser Pulse

Qin

Hao

et al. 2015

Plasmonics

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Features of the asymmetric nanocross including extinction spectrum, local electric field intensity, and temporal response of the local electric field under ultrashort laser illumination are investigated in this paper. It is found that, due to the simultaneous excitation of local electric fields in the arms that are perpendicular and parallel to the laser polarization direction of the asymmetric nanocross, extinction spectrum exhibits multiple resonant peaks and the position of the peaks can be tuned by changing the lengths of the arms. Simulation results disclose that there is a strong connection between optical response of the parallel and perpendicular arms. Moreover, temporal response of electric field in arms of the asymmetric nanocross shows that oscillations in the parallel arms start earlier than that of the perpendicular arms, and they are in phase when one of the parallel arms resonantly excited, which further reflects the relationship between the parallel and perpendicular arms. Therefore, we demonstrate that the perpendicular arm excitation is attributed to that of the nonresonant parallel arm in the asymmetric structure which cannot keep the overall electric neutrality of the nanostructure, and thus, perpendicular arms are activated to maintain this balance.

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Spatiotemporal control of femtosecond plasmon using plasmon response functions measured by near-field scanning optical microscopy (NSOM)

Cited by 25 publications

References 12 publications

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

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

Control of grating-coupled ultrafast surface plasmon pulse and its nonlinear emission by shaping femtosecond laser pulse

Features of Local Electric Field Excitation in Asymmetric Nanocross Illuminated by Ultrafast Laser Pulse

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