scholarly journals From Far-Field to Near-Field Micro- and Nanoparticle Optical Trapping

2020 ◽  
Vol 10 (4) ◽  
pp. 1375 ◽  
Author(s):  
Theodoros D. Bouloumis ◽  
Síle Nic Chormaic
Keyword(s):  
Optical Tweezers ◽  
Near Field ◽  
Metallic Nanostructures ◽  
Diffraction Limit ◽  
Submicron Particles ◽  
Great Success ◽  
Laser Illumination ◽  
Minimum Particle Size ◽  
Standard Tool ◽  
Established Technique

Optical tweezers are a very well-established technique that have developed into a standard tool for trapping and manipulating micron and submicron particles with great success in the last decades. Although the nature of light enforces restrictions on the minimum particle size that can be efficiently trapped due to Abbe’s diffraction limit, scientists have managed to overcome this problem by engineering new devices that exploit near-field effects. Nowadays, metallic nanostructures can be fabricated which, under laser illumination, produce a secondary plasmonic field that does not suffer from the diffraction limit. This advance offers a great improvement in nanoparticle trapping, as it relaxes the trapping requirements compared to conventional optical tweezers although problems may arise due to thermal heating of the metallic nanostructures. This could hinder efficient trapping and damage the trapped object. In this work, we review the fundamentals of conventional optical tweezers, the so-called plasmonic tweezers, and related phenomena. Starting from the conception of the idea by Arthur Ashkin until recent improvements and applications, we present the principles of these techniques along with their limitations. Emphasis in this review is on the successive improvements of the techniques and the innovative aspects that have been devised to overcome some of the main challenges.

Optical Trapping, Sensing, and Imaging by Photonic Nanojets

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 434
Author(s):  
Heng Li ◽  
Wanying Song ◽  
Yanan Zhao ◽  
Qin Cao ◽  
Ahao Wen
Keyword(s):  
Optical Tweezers ◽  
Optical Trapping ◽  
Near Field ◽  
Super Resolution ◽  
Diffraction Limit ◽  
Research Progress ◽  
Optical Forces ◽  
Resolution Imaging ◽  
Photonic Nanojets ◽  
Near Field Scanning

The optical trapping, sensing, and imaging of nanostructures and biological samples are research hotspots in the fields of biomedicine and nanophotonics. However, because of the diffraction limit of light, traditional optical tweezers and microscopy are difficult to use to trap and observe objects smaller than 200 nm. Near-field scanning probes, metamaterial superlenses, and photonic crystals have been designed to overcome the diffraction limit, and thus are used for nanoscale optical trapping, sensing, and imaging. Additionally, photonic nanojets that are simply generated by dielectric microspheres can break the diffraction limit and enhance optical forces, detection signals, and imaging resolution. In this review, we summarize the current types of microsphere lenses, as well as their principles and applications in nano-optical trapping, signal enhancement, and super-resolution imaging, with particular attention paid to research progress in photonic nanojets for the trapping, sensing, and imaging of biological cells and tissues.

High-resolution Raman imaging by optically tweezing a dielectric microsphere

2007 ◽  
Vol 1025 ◽  
Author(s):  
Johnson Kasim ◽  
T. Yu ◽  
Y. M. You ◽  
J. P. Liu ◽  
A. K. H. See ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Resolution ◽  
Optical Tweezers ◽  
Spatial Resolution ◽  
Near Field ◽  
Diffraction Limit ◽  
Raman Imaging ◽  
Polystyrene Microsphere

AbstractWe show a different method in doing near-field Raman imaging with sub-diffraction limit spatial resolution. A dielectric microsphere (for example polystyrene microsphere) is trapped by optical tweezers. The microsphere is used to focus the laser to the sample, and also to collect the scattered Raman signals. We show the capability of this method in imaging various types of samples, such as SiGe/Si structures, gold nanopattern and carbon nanotubes. This method is comparatively easier to perform, better repeatability, and stronger signal than the normal near-field Raman techniques.

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

Nanophotonics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 1227-1245 ◽  
Author(s):  
Domna G. Kotsifaki ◽  
Síle Nic Chormaic
Keyword(s):  
Optical Tweezers ◽  
Near Field ◽  
Metallic Nanostructures ◽  
Research Progress ◽  
Future Research ◽  
Research Directions ◽  
Precise Control ◽  
Wide Range ◽  
Wavelength Scale ◽  
Future Research Directions

AbstractThe ability of metallic nanostructures to confine light at the sub-wavelength scale enables new perspectives and opportunities in the field of nanotechnology. Making use of this unique advantage, nano-optical trapping techniques have been developed to tackle new challenges in a wide range of areas from biology to quantum optics. In this work, starting from basic theories, we present a review of research progress in near-field optical manipulation techniques based on metallic nanostructures, with an emphasis on some of the most promising advances in molecular technology, such as the precise control of single biomolecules. We also provide an overview of possible future research directions of nanomanipulation techniques.

Confocal Raman mapping

1992 ◽  
Vol 50 (2) ◽  
pp. 1514-1515
Author(s):  
J. Barbillat ◽  
M. Delhaye ◽  
P. Dhamelincourt
Keyword(s):  
Chemical Species ◽  
Diffraction Limit ◽  
Microscopic Level ◽  
Raman Mapping ◽  
Complete Spectrum ◽  
Laser Illumination ◽  
Ccd Detector ◽  
Raman Microprobe ◽  
Photodiode Array ◽  
Raman Image

Raman mapping, with a spatial resolution close to the diffraction limit, can help to reveal the distribution of chemical species at the surface of an heterogeneous sample.As early as 1975,three methods of sample laser illumination and detector configuration have been proposed to perform Raman mapping at the microscopic level (Fig. 1),:- Point illumination:The basic design of the instrument is a classical Raman microprobe equipped with a PM tube or either a linear photodiode array or a two-dimensional CCD detector. A laser beam is focused on a very small area ,close to the diffraction limit.In order to explore the whole surface of the sample,the specimen is moved sequentially beneath the microscope by means of a motorized XY stage. For each point analyzed, a complete spectrum is obtained from which spectral information of interest is extracted for Raman image reconstruction.- Line illuminationA narrow laser line is focused onto the sample either by a cylindrical lens or by a scanning device and is optically conjugated with the entrance slit of the stigmatic spectrograph.

Ultra-broadband unidirectional launching of surface plasmon polaritons by a double-slit structure beyond the diffraction limit

Nanoscale ◽  
2014 ◽  
Vol 6 (22) ◽  
pp. 13487-13493 ◽  
Author(s):  
Jianjun Chen ◽  
Chengwei Sun ◽  
Hongyun Li ◽  
Qihuang Gong
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Near Field ◽  
Diffraction Limit ◽  
Plasmonic Waveguide ◽  
Plasmon Polaritons ◽  
Double Slit

Based on the near-field interference of two slit apertures in a subwavelength plasmonic waveguide, an ultra-broadband unidirectional SPP launcher beyond the diffraction limit was experimentally realized. This ultra-small SPP launcher has important applications in high-integration plasmonic circuits.

scholarly journals Subwavelength Nanostructuring of Gold Films by Apertureless Scanning Probe Lithography Assisted by a Femtosecond Fiber Laser Oscillator

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 536 ◽  
Author(s):  
Ignacio Falcón Casas ◽  
Wolfgang Kautek
Keyword(s):  
Fiber Laser ◽  
Near Field ◽  
Diffraction Limit ◽  
High Repetition Rate ◽  
Scanning Probe ◽  
Optical Methods ◽  
Laser Source ◽  
Gold Films ◽  
Laser Oscillator ◽  
Scanning Probe Lithography

Optical methods in nanolithography have been traditionally limited by Abbe’s diffraction limit. One method able to overcome this barrier is apertureless scanning probe lithography assisted by laser. This technique has demonstrated surface nanostructuring below the diffraction limit. In this study, we demonstrate how a femtosecond Yb-doped fiber laser oscillator running at high repetition rate of 46 MHz and a pulse duration of 150 fs can serve as the laser source for near-field nanolithography. Subwavelength features were generated on the surface of gold films down to a linewidth of 10 nm. The near-field enhancement in this apertureless scanning probe lithography setup could be determined experimentally for the first time. Simulations were in good agreement with the experiments. This result supports near-field tip-enhancement as the major physical mechanisms responsible for the nanostructuring.

Near-field nonlinear imaging of an anapole mode beyond diffraction limit

2021 ◽  
Author(s):  
Tong Cui ◽  
Mingqian Zhang ◽  
Yun Zhao ◽  
Yuanmu Yang ◽  
Benfeng Bai ◽  
...  
Keyword(s):  
Near Field ◽  
Diffraction Limit ◽  
Nonlinear Imaging

scholarly journals Near‐Field Optical Tweezers for Chemistry and Biology

2020 ◽  
Vol 217 (1) ◽  
pp. 2070010 ◽  
Author(s):  
Sheng Hu ◽  
Zi-wei Liao ◽  
Lu Cai ◽  
Xiao-xiao Jiang
Keyword(s):  
Optical Tweezers ◽  
Near Field

Enhanced Plasmonic Behavior of Metal Nanoparticles Surrounded With Dielectric Shell

2019 ◽  
Author(s):  
Anil Yuksel ◽  
Michael Cullinan ◽  
Edward T. Yu ◽  
Jayathi Murthy
Keyword(s):  
Metal Nanoparticles ◽  
Near Infrared ◽  
Energy Transport ◽  
Near Field ◽  
Metal Nanoparticle ◽  
Infrared Wavelength ◽  
Laser Illumination ◽  
Dielectric Media ◽  
Dielectric Shell ◽  
Laser Sources

Abstract Metal nanoparticles have attracted intense attention due to their unique optical and thermal properties in various next generation applications such as micro-nano electronics and photonics. The near-field confinement between closely packed metal nanoparticles, which is enhanced due to their plasmonic behavior, creates high thermal energy densities under visible to near-infrared wavelength laser irradiation. As metal nanoparticles tend to be oxidized or change shape under laser illumination, resulting in nonlinear optical and thermal behavior, surrounding each metal nanoparticle with a dielectric shell could be a potential way to prevent these effects as well as to engineer their plasmonic behavior. In this study, we investigate energy transport within dimer and 4 nanoparticle (chain) configurations of 50 nm radius Au nanoparticles surrounded by dielectric shells under illumination from various laser sources in different dielectric media.

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