Opto-Mechanical Force Mapping of Deep Subwavelength Plasmonic Modes

Kohoutek, John; Dey, Dibyendu; Bonakdar, Alireza; Gelfand, Ryan M.; Sklar, Alejandro; Memiş, Ömer Gökalp; Mohseni, Hooman

doi:10.1021/nl201780y

Cited by 46 publications

(45 citation statements)

References 29 publications

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“…Consequently, the averaged surface-induced force is relatively small because the surface forces depend strongly on the tip-sample separation. Thus, in these conditions the magnitudes of OIF become comparable to the surface forces present in typical experimental conditions [11,56,58,59].…”

Section: Effect Of Optically Induced Forcesmentioning

confidence: 63%

Optically induced forces in scanning probe microscopy

et al. 2014

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Typical measurements of light in the near-field utilize a photodetector such as a photomultiplier tube or a photodiode, which is placed remotely from the region under test. This kind of detection has many draw-backs including the necessity to detect light in the far-field, the influence of background propagating radiation, the relatively narrowband operation of photodetectors which complicates the operation over a wide wavelength range, and the difficulty in detecting radiation in the far-IR and THz. Here we review an alternative near-field light measurement technique based on the detection of optically induced forces acting on the scanning probe. This type of detection overcomes some of the above limitations, permitting true broad-band detection of light directly in the near-field with a single detector. The physical origins and the main characteristics of optical force detection are reviewed. In addition, intrinsic effects of the inherent optical forces for certain operation modalities of scanning probe microscopy are discussed. Finally, we review practical applications of optical force detection of interest for the broader field of the scanning probe microscopy.

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Section: Effect Of Optically Induced Forcesmentioning

confidence: 63%

Optically induced forces in scanning probe microscopy

et al. 2014

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“…This is of the same order or even slightly larger than in typical optomechanical experiment. 37 We can take much smaller nanoparticle with a 5 nm and obtain much larger force. …”

Section: A Parameter Estimatesmentioning

confidence: 99%

Superattraction mediated by quantum fluctuations of plasmon quasi-continuum

2015

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We investigate the force between plasmonic nanoparticle and highly excited two-level system (molecule). Usually van der Waals force between nanoscale electrically neutral systems is monotonic and attractive at moderate and larger distances and repulsive at small distances. In our system, the van der Waals force acting on molecule has optical nature. At moderate distances it is attractive as usual but its strength highly increases in a narrow distance ranges ("lacunas"). We show that quantum fluctuations of (quasi)continuum of multipole plasmons of high, nearly infinite degree altogether form effective environment and determine the interaction force while their spectral peculiarities stand behind the large and narrow lacunas in force. We solve exactly the Hamiltonian problem and discuss the role of the dissipation.

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“…Dielectric and metallic particles in the sub 100-nm range have been trapped with plasmonic nano-antennas, [9][10][11] and by optical pulling in fishnet metamaterial modeling; 12 also by double nano-holes 13 that have shown ability to trap single proteins. 14 The necessity to manipulate substances down to single molecule leaves open the interesting problem to trap and position such tiny object with full control and unobstructed light access: optical trapping ability of nanometric objects is limited as the object is reduced to 50 nm size or less, as trapping force is too weak to give stable trapping under Brownian motion.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of nanoparticles for generation of force and torque at nanoscale

et al. 2013

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Chiral patterns are created by focused ion-beam milling nano-grooves with sub-15 nm resolution on thin metal films and arrays of nanoparticles, scattering and absorbing light selectively for left and right circularly polarized light, with high fidelity over fields up to 100 x 100 mu m(2) without positioning errors. This allows to carry out numerical simulations to estimate light enhancement and circular dichroism both on ideal and realistic particles taken from SEM images, showing doubling of scattering cross-section and enhancement changes up to 5 times controlled by dichroism, with localized field enhancements up to 20000. 3D plasmonic structures extending out of a gold film plane are created by dry etching of the film in the openings of a resist mask defined by electron beam lithography. Conical vertical protrusions (nano-wells) are left, and their optical properties are numerically simulated, showing easily reachable out-of-plane trapping of both dielectric and metal plasmonic nano-spheres, with trapping forces up to 20 pN/W/mu m(2). Wideband refractive index spectra in 3D-FDTD are correctly represented by overcoming the polynomial approximations to give accurate field and force/torque results for generalized artificial materials

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Opto-Mechanical Force Mapping of Deep Subwavelength Plasmonic Modes

Cited by 46 publications

References 29 publications

Optically induced forces in scanning probe microscopy

Optically induced forces in scanning probe microscopy

Superattraction mediated by quantum fluctuations of plasmon quasi-continuum

Fabrication of nanoparticles for generation of force and torque at nanoscale

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