Optical trapping through the localized surface-plasmon resonance of engineered gold nanoblock pairs

Abstract

Abstract:We have investigated the plasmonic trapping of dielectric nanoparticles by using engineered gold nanoblock pairs with ~5-nm gaps. Pairs with surface-plasmon resonance peaks at the incident wavelength allow the trapping of 350-nm-diameter nanoparticles with 200 W/cm 2 laser intensities, and their plasmon resonance properties and trapping performance are drastically modified by varying the nanoblock size of ~20%. In addition, plasmon resonance properties of nanoblock pairs strongly depend on the direction of the linear polarization of the incident laser, which determines the trapping performance. ©2011 Optical Society of America References and links1. K. Okamoto and S. Kawata, "Radiation force exerted on subwavelength particles near a nanoaperture," Phys.Rev. Lett. 83(22), 4534-4537 (1999). 2. P. C. Chaumet, A. Rahmani, and M. Nieto-Vesperinas, "Optical trapping and manipulation of nano-objects with an apertureless probe," Phys.

Plasmonic optical tweezers based on nanostructures: fundamentals, advances and prospects

“…Additionally, several plasmonic patterns, which are tunable, have been demonstrated to dynamically trap particles, and some of these novel geometries are summarized in this sub-section. Particularly, Tanaka et al [102,149] studied theoretically and experimentally the strong trapping potential which can be formed using gold nanoblock pairs. They demonstrated that the size and orientation of the pairs of gold nanoblocks, with 5 nm gaps, determine their surface-plasmon resonance properties and trapping performance in conjunction with the wavelength and the polarization direction of the incident laser [102].…”

“…They demonstrated that the size and orientation of the pairs of gold nanoblocks, with 5 nm gaps, determine their surface-plasmon resonance properties and trapping performance in conjunction with the wavelength and the polarization direction of the incident laser [102]. Moreover, they demonstrated optical trapping of 350 nm polystyrene particles with 750 W/cm 2 laser intensities [102]. Similarly, 2 years later, they performed two-dimensional mapping of the optical trapping of 100 nm fluorescent polystyrene particles above a gold nanoblock pair that had a 6 nm edge-to-edge separation [149].…”

Optical trapping and manipulation of micrometer and submicrometer particles

“…The authors showed that the particle's [115] 2013, Nano Lett.) [117] 2011, Opt. Express) motion always served to create a force that pushed the particle back to its equilibrium position.…”

“…Localized surface plasmons can be used for enhanced trapping well below the diffraction limit. Tanaka et al referred to this ability as superresolution optical trapping [117]. Their plasmonic structure consisted of only two square gold nanoblocks, as shown in Fig.…”

Switching of Giant Lateral Force on Sub‐10 nm Particle Using Phase‐Change Nanoantenna

“…[2][3][4][5] This drawback can be overcome with plasmonic nanoapertures in metallic films [6,7] and planar waveguides [8] where the nanostructures can produce a giant near-field gradient in the subwavelength area, [9] enabling precise trapping, manipulation, and characterization of nanoparticles. For example, plasmonic nanostructures such as nanorods, [17] nanorings, [18] antennae, [19] and coaxial apertures [20] have a well-defined trapping site in the gap region between the resonators and are capable of trapping molecules a few tens of nanometers in size. The LSPR modes are characterized by exponential decay of the EM fields DOI: 10.1002/adts.201700027 away from the interface of the metal and dielectric.…”