3D dynamic motion of a dielectric micro-sphere within optical tweezers

Liu, Jing; Zheng, Mai; Xiong, Zhigang; Li, Zhiyuan

doi:10.29026/oea.2021.200015

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…This resonance leads to large enhancements of local electromagnetic field around the nanoparticle surface [2] and is sensitive to nanoparticle size, shape, composition and deposited substrate as well as the external dielectric environment [3]. These unique properties make the research of LSPR spectroscopy significant for application to surface-enhanced Raman scattering (SERS) [4], chemical and biological sensing [5], antennae [6,7] and so on.…”

Section: Introductionmentioning

confidence: 99%

Control of Surface Plasmon Resonance in Silver Nanocubes by CEP-Locked Laser Pulse

Liu

2022

Photonics

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Localized surface plasmon resonance (LSPR) of metal nanoparticles has attracted increasing attention in surface-enhanced Raman scattering, chemical and biological sensing applications. In this article, we calculate the optical extinction spectra of a silver nanocube driven by an ultrashort carrier envelope phase (CEP)-locked laser pulse. Five LSPR modes are clearly excited in the optical spectra. We analyze the physical origin of each mode from the charge distribution on different parts of the cubic particle and the dipole and quadrupole excitation features at the LSPR peaks. The charge distribution follows a simple rule that when the charge concentrates from the face to the corners of the cubic particle, the resonant wavelength red-shifts. Then we modulate the LSPR spectra by changing CEP. The results show that CEP has selective plasmon mode excitation functionality and can act as a novel modulation role on LSPR modes. Our work suggests a novel means to regulate LSPR modes and the corresponding optical properties of metal nanoparticles via various freedoms of controlled optical field, which can be useful for optimized applications in chemical and biological sensors, single molecule detection, and so on.

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Section: Introductionmentioning

confidence: 99%

Control of Surface Plasmon Resonance in Silver Nanocubes by CEP-Locked Laser Pulse

Liu

2022

Photonics

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“…Furthermore, we numerically examined the trap stability of the OAM beams, which can be well characterized by the optical trap stiffness. This trap stiffness is defined by the change in optical trap force at the vortex beam's intensity peak per unit of deviation [23,24]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Characterization of optical forces and torques in polystyrene spheres steered by tightly focused orbital angular momentum beams

Miao,

Long,

Zhang

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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With orbital angular momentum, tightly focused vortex beams can impose optical torque on particles through momentum transfer. In this paper, based on the Richards-Wolf vector diffraction theory, we examine the forces and moments exerted on Mie particles by a tightly focused beam, including the impact of the beam's intensity distribution and the topological charge (TC) number on particle trapping stability. Numerical calculations are conducted to assess the effects of corresponding parameters on the characteristics of the optical radiation force and the tight focusing properties. Our resultsshow that the direction of the particle's rotation is determined by the sign of the TC numbers and that there is a direct relationship between the magnitude of the induced torque and the TCs. Furthermore, the stability of particle control can be improved by OAM beams with small TCs. These results have potential applications in light capture, optical storage, and optical imaging.

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“…First UCNPs pH-sensors were obtained by coating NaYF 4 :Er 3+ ,Yb 3+ with polyglutamic porphyrindendrimers 16 . The energy transfer from the UCNP to the porphyrin chromophore exhibits a pH-dependent absorption at 660 nm, leading to a decrease of the red luminescence emission of the UCNP with decreasing pH and so, to a pH-dependent red-to-green emission ratio 98 . First demonstration of pH sensing based on a single UCMP was published by K. Suresh et al 17 In their pioneering work authors demonstrated how an optically trapped polyethyleneimine capped UCMP can act as a broad range pH probe.…”

Section: Chemical Sensing With An Optically Trapped Lanthanide-doped ...mentioning

confidence: 99%

Optical trapping of optical nanoparticles: Fundamentals and applications

Zhang,

Camarero,

Haro-González

et al. 2023

OES

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Optical nanoparticles are nowadays one of the key elements of photonics. They do not only allow optical imaging of a plethora of systems (from cells to microelectronics), but, in many cases, they also behave as highly sensitive remote sensors. In recent years, it has been demonstrated the success of optical tweezers in isolating and manipulating individual optical nanoparticles. This has opened the door to high resolution single particle scanning and sensing. In this quickly growing field, it is now necessary to sum up what has been achieved so far to identify the appropriate system and experimental set-up required for each application. In this review article we summarize the most relevant results in the field of optical trapping of individual optical nanoparticles. After systematic bibliographic research, we identify the main families of optical nanoparticles in which optical trapping has been demonstrated. For each case, the main advances and applications have been described. Finally, we also include our critical opinion about the future of the field, identifying the challenges that we are facing.

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3D dynamic motion of a dielectric micro-sphere within optical tweezers

Cited by 16 publications

References 28 publications

Control of Surface Plasmon Resonance in Silver Nanocubes by CEP-Locked Laser Pulse

Control of Surface Plasmon Resonance in Silver Nanocubes by CEP-Locked Laser Pulse

Characterization of optical forces and torques in polystyrene spheres steered by tightly focused orbital angular momentum beams

Optical trapping of optical nanoparticles: Fundamentals and applications

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