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Micromachines
Special Issues
Optical Trapping of Micro/Nanoparticles
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Optical Trapping of Micro/Nanoparticles

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (30 May 2021) | Viewed by 7330

Special Issue Editors

Dr. Patricia Haro González

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Guest Editor
Materials physics department, Universidad Autónoma de Madrid, Madrid, Spain
Interests: optical tweezer; spectroscopy; luminescence; biophotonic; biophysics
Special Issues, Collections and Topics in MDPI journals
Dr. Paloma Rodríguez Sevilla

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Guest Editor
Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, Calle Francisco Tomás y Valiente, 7, 28049 Madrid, Spain
Interests: optical manipularion; luminescence; upconversion; microsensors

Special Issue Information

Dear Colleagues,

Since Ashkin’s pioneering works, optical tweezers have become an essential tool to immobilize and manipulate micro- and nanoscale objects. In recent years, the most relevant topic in this field has been studies focused on the trapping dynamics of individual sub-100 nm objects. Their use is key for a variety of applications, including single molecule spectroscopy, colloidal dynamics, tailored particle assembly, protein isolation, high-resolution surface studies, the controlled investigation of biological processes, and surface-enhanced spectroscopy. In addition, the number of biosensing techniques based on optical trapping is continuously increasing due to the synergy between optical engineering and material science. This Special Issue welcomes contributions on optical trapping and the manipulation of micro/nanoparticles. These may comprise both theoretical and experimental studies, and applications of optical manipulation methods on (but not limited to) dielectric, metal, lumincescent, and nonluminescent micro/nanoparticles.

The Special Issue will accept diverse forms of contributions, including research papers and review articles and etc.

Dr. Patricia Haro González
Dr. Paloma Rodríguez Sevilla
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Optical trapping
  • Luminescent micro/nanoparticles
  • Dielectric micro/nanoparticles
  • Metal micro/nanoparticles
  • Nonluminescent micro/nanoparticles
  • Other micro/nanomaterials

Published Papers (3 papers)

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Research

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7 pages, 971 KiB  
Article
Lateral Deformation of Human Red Blood Cells by Optical Tweezers
by Pavel Yale, Michel A. Kouacou, Jean-Michel E. Konin, Eugène Megnassan and Jérémie T. Zoueu
Micromachines 2021, 12(9), 1024; https://doi.org/10.3390/mi12091024 - 27 Aug 2021
Cited by 2 | Viewed by 1930
Abstract
In this paper, we studied the lateral deformation of human red blood cells (RBCs) during lateral indentation by an optically trapped silica bead with a diameter of 4.5 µm (Bangs Laboratories, Inc. Fishers, IN, USA). The images were captured using a CCD camera [...] Read more.
In this paper, we studied the lateral deformation of human red blood cells (RBCs) during lateral indentation by an optically trapped silica bead with a diameter of 4.5 µm (Bangs Laboratories, Inc. Fishers, IN, USA). The images were captured using a CCD camera and the Boltzmann statistics method was used for force calibration. Using the Hertz model, we calculated and compared the elastic stiffness resulting from the lateral force, showing that the differences are important and that the force should be considered. Besides the lateral component, this setup also allowed us to examine the lateral cell–bead interaction. The mean values of the cell shear stiffness measured during indentation were 3.37 ± 0.40 µN/m for biconcave RBCs, 3.48 ± 0.23 µN/m for spherical RBCs, and 3.80 ± 0.22 µN/m for crenelated RBCs, respectively. These results show that this approach can be used as a routine method for RBC study, because it enabled us to manipulate the cell without contact with the wall. Full article
(This article belongs to the Special Issue Optical Trapping of Micro/Nanoparticles)
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9 pages, 1623 KiB  
Article
Positioning Accuracy in Holographic Optical Traps
by Frederic Català-Castro and Estela Martín-Badosa
Micromachines 2021, 12(5), 559; https://doi.org/10.3390/mi12050559 - 15 May 2021
Cited by 3 | Viewed by 2199
Abstract
Spatial light modulators (SLMs) have been widely used to achieve dynamic control of optical traps. Often, holographic optical tweezers have been presumed to provide nanometer or sub-nanometer positioning accuracy. It is known that some features concerning the digitalized structure of SLMs cause a [...] Read more.
Spatial light modulators (SLMs) have been widely used to achieve dynamic control of optical traps. Often, holographic optical tweezers have been presumed to provide nanometer or sub-nanometer positioning accuracy. It is known that some features concerning the digitalized structure of SLMs cause a loss in steering efficiency of the optical trap, but their effect on trap positioning accuracy has been scarcely analyzed. On the one hand, the SLM look-up-table, which we found to depend on laser power, produces positioning deviations when the trap is moved at the micron scale. On the other hand, phase quantization, which makes linear phase gratings become phase staircase profiles, leads to unexpected local errors in the steering angle. We have tracked optically trapped microspheres with sub-nanometer accuracy to study the effects on trap positioning, which can be as high as 2 nm in certain cases. We have also implemented a correction strategy that enabled the reduction of errors down to 0.3 nm. Full article
(This article belongs to the Special Issue Optical Trapping of Micro/Nanoparticles)
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Review

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13 pages, 1491 KiB  
Review
Temperature Effects on Optical Trapping Stability
by Dasheng Lu, Francisco Gámez and Patricia Haro-González
Micromachines 2021, 12(8), 954; https://doi.org/10.3390/mi12080954 - 12 Aug 2021
Cited by 12 | Viewed by 2444
Abstract
In recent years, optically trapped luminescent particles have emerged as a reliable probe for contactless thermal sensing because of the dependence of their luminescence on environmental conditions. Although the temperature effect in the optical trapping stability has not always been the object of [...] Read more.
In recent years, optically trapped luminescent particles have emerged as a reliable probe for contactless thermal sensing because of the dependence of their luminescence on environmental conditions. Although the temperature effect in the optical trapping stability has not always been the object of study, the optical trapping of micro/nanoparticles above room temperature is hindered by disturbances caused by temperature increments of even a few degrees in the Brownian motion that may lead to the release of the particle from the trap. In this report, we summarize recent experimental results on thermal sensing experiments in which micro/nanoparticles are used as probes with the aim of providing the contemporary state of the art about temperature effects in the stability of potential trapping processes. Full article
(This article belongs to the Special Issue Optical Trapping of Micro/Nanoparticles)
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