scholarly journals Numerical and Experimental Investigation on the Optical Manipulation from an Axicon Lensed Fiber

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 187
Author(s):  
Wu Zhang ◽  
Yanxiao Lin ◽  
Yusong Gao ◽  
Zekai Guo ◽  
Xiangling Li ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Fluid Flow ◽  
Optical Trapping ◽  
Incident Light ◽  
Microfluidic Channel ◽  
Flow Speed ◽  
Optical Force ◽  
Optical Manipulation ◽  
Incident Wavelength ◽  
Polystyrene Microsphere

Here we numerically and experimentally studied the optical trapping on a microsphere from an axicon lensed fiber (ALF). The optical force from the fiber with different tapered lengths and by incident light at different wavelengths is calculated. Numerically, the microsphere can be trapped by the fiber with tapered outline y=±x/0.5 and y=±x at a short incident wavelength of 900 nm. While for the fiber with tapered outline y=±x/2, the microsphere can be trapped by the light with longer wavelength of 1100 nm, 1300 nm, or 1500 nm. The optical trapping to a polystyrene microsphere is experimentally demonstrated in a microfluidic channel and the corresponding optical force is derived according to the fluid flow speed. This study can provide a guidance for future tapered fibre design for optical trapping to microspheres.

scholarly journals Optical Pulling Using Chiral Metalens as a Photonic Probe

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3376
Author(s):  
Miao Peng ◽  
Hui Luo ◽  
Zhaojian Zhang ◽  
Tengfang Kuang ◽  
Dingbo Chen ◽  
...  
Keyword(s):  
Incident Light ◽  
Longitudinal Optical ◽  
Optical Force ◽  
Optical Manipulation ◽  
Maximum Value ◽  
Broadband Spectrum ◽  
Course Control ◽  
Pulling Forces ◽  
Potential Applications ◽  
Pulling Force

Optical pulling forces, which can pull objects in the source direction, have emerged as an intensively explored field in recent years. Conventionally, optical pulling forces exerted on objects can be achieved by tailoring the properties of an electromagnetic field, the surrounding environment, or the particles themselves. Recently, the idea of applying conventional lenses or prisms as photonic probes has been proposed to realize an optical pulling force. However, their sizes are far beyond the scope of optical manipulation. Here, we design a chiral metalens as the photonic probe to generate a robust optical pulling force. The induced pulling force exerted on the metalens, characterized by a broadband spectrum over 0.6 μm (from 1.517 to 2.117 μm) bandwidth, reached a maximum value of −83.76 pN/W. Moreover, under the illumination of incident light with different circular polarization states, the longitudinal optical force acting on the metalens showed a circular dichroism response. This means that the longitudinal optical force can be flexibly tuned from a pulling force to a pushing force by controlling the polarization of the incident light. This work could pave the way for a new advanced optical manipulation technique, with potential applications ranging from contactless wafer-scale fabrication to cell assembly and even course control for spacecraft.

scholarly journals Optical Manipulation with Plasmonic Beam Shaping Antenna Structures

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Young Chul Jun ◽  
Igal Brener
Keyword(s):  
Optical Trapping ◽  
Near Field ◽  
Beam Shaping ◽  
Optical Force ◽  
Metal Nanostructures ◽  
Optical Manipulation ◽  
Far Field ◽  
Optical Forces ◽  
Optical Components

Near-field optical trapping of objects using plasmonic antenna structures has recently attracted great attention. However, metal nanostructures also provide a compact platform for general wavefront engineering of intermediate and far-field beams. Here, we analyze optical forces generated by plasmonic beam shaping antenna structures and show that they can be used for general optical manipulation such as guiding of a dielectric particle along a linear or curved trajectory. This removes the need for bulky diffractive optical components and facilitates the integration of optical force manipulation into a highly functional, compact system.

scholarly journals Plasmonic linear nanomotor using lateral optical forces

2020 ◽  
Vol 6 (45) ◽  
pp. eabc3726
Author(s):  
Yoshito Y. Tanaka ◽  
Pablo Albella ◽  
Mohsen Rahmani ◽  
Vincenzo Giannini ◽  
Stefan A. Maier ◽  
...  
Keyword(s):  
Laser Beam ◽  
Incident Light ◽  
Lateral Force ◽  
Diffraction Limit ◽  
Propagation Direction ◽  
Optical Force ◽  
Optical Forces ◽  
Incident Laser ◽  
New Class ◽  
Force Direction

Optical force is a powerful tool to actuate micromachines. Conventional approaches often require focusing and steering an incident laser beam, resulting in a bottleneck for the integration of the optically actuated machines. Here, we propose a linear nanomotor based on a plasmonic particle that generates, even when illuminated with a plane wave, a lateral optical force due to its directional side scattering. This force direction is determined by the orientation of the nanoparticle rather than a field gradient or propagation direction of the incident light. We demonstrate the arrangements of the particles allow controlling the lateral force distributions with the resolution beyond the diffraction limit, which can produce movements, as designed, of microobjects in which they are embedded without shaping and steering the laser beam. Our nanomotor to engineer the experienced force can open the door to a new class of micro/nanomechanical devices that can be entirely operated by light.

Manipulation of yeast cells in a microfluidic channel using the GPC-based optical trapping system

2006 ◽  
Author(s):  
Ivan R. Perch-Nielsen ◽  
Peter John Rodrigo ◽  
Jesper Glückstad
Keyword(s):  
Optical Trapping ◽  
Microfluidic Channel ◽  
Yeast Cells

scholarly journals Photorelease of phosphates: Mild methods for protecting phosphate derivatives

2014 ◽  
Vol 10 ◽  
pp. 2038-2054 ◽  
Author(s):  
Sanjeewa N Senadheera ◽  
Abraham L Yousef ◽  
Richard S Givens
Keyword(s):  
Excited State ◽  
Incident Light ◽  
Protecting Group ◽  
Triplet Excited State ◽  
Ambient Conditions ◽  
Incident Wavelength ◽  
Aqueous Acetonitrile ◽  
Favorskii Rearrangement ◽  
Naphthyl Ring ◽  
Diethyl Phosphate

We have developed a new photoremovable protecting group for caging phosphates in the near UV. Diethyl 2-(4-hydroxy-1-naphthyl)-2-oxoethyl phosphate (14a) quantitatively releases diethyl phosphate upon irradiation in aq MeOH or aq MeCN at 350 nm, with quantum efficiencies ranging from 0.021 to 0.067 depending on the solvent composition. The deprotection reactions originate from the triplet excited state, are robust under ambient conditions and can be carried on to 100% conversion. Similar results were found with diethyl 2-(4-methoxy-1-naphthyl)-2-oxoethyl phosphate (14b), although it was significantly less efficient compared with 14a. A key step in the deprotection reaction in aq MeOH is considered to be a Favorskii rearrangement of the naphthyl ketone motif of 14a,b to naphthylacetate esters 25 and 26. Disruption of the ketone-naphthyl ring conjugation significantly shifts the photoproduct absorption away from the effective incident wavelength for decaging of 14, driving the reaction to completion. The Favorskii rearrangement does not occur in aqueous acetonitrile although diethyl phosphate is released. Other substitution patterns on the naphthyl or quinolin-5-yl core, such as the 2,6-naphthyl 10 or 8-benzyloxyquinolin-5-yl 24 platforms, also do not rearrange by aryl migration upon photolysis and, therefore, do not proceed to completion. The 2,6-naphthyl ketone platform instead remains intact whereas the quinolin-5-yl ketone fragments to a much more complex, highly absorbing reaction mixture that competes for the incident light.

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