Výsledky vyhledávání

Fresnel lens optical fiber tweezers to evaluate the vitality of single algae cells

Autor: Michael Heymann, Asa Asadollahbaik, Harald Giessen, Jochen Fick, Aashutosh Kumar

Publikováno v: Optics letters. 47(1)

Dunaliella salina algae are trapped and studied using dual-fiber optical tweezers based on nano-imprinted Fresnel lenses. Different forms of cyclic motion of living algae inside the optical trap are observed and analyzed. A characteristic periodic mo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20185afacb149b46b66aff1247b0afd0
https://pubmed.ncbi.nlm.nih.gov/34951909

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Structured light to miniaturize optical micromanipulation

Autor: Harald Giessen, Johannes Drozella, Ksenia Weber, Asa Asadollahbaik, Florian Sterl, Aashutosh Kumar, Michael Heymann, Jochen Fick, Alois Herkommer, Simon Thiele

Publikováno v: Optical Trapping and Optical Micromanipulation XVIII.

Optical trapping is the science of holding and immobilizing particles and cells, for further manipulation and spectroscopic studies. Enhancing the application of optical trapping is limited by size and flexibility of this tool, mostly limited to high

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f16d758fbade4bf607ca6e92ed7c33b0
https://doi.org/10.1117/12.2596522

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Colloidal Rare Earth Vanadate Single Crystalline Particles as Ratiometric Luminescent Thermometers

Autor: Godefroy Leménager, Juliette Alain, Eric Larquet, Paulo C. de Sousa Filho, Jochen Fick, Thierry Gacoin, Osvaldo Antonio Serra

Publikováno v: Journal of Physical Chemistry C
Journal of Physical Chemistry C, American Chemical Society, 2019, 123 (4), pp.2441-2450. ⟨10.1021/acs.jpcc.8b12251⟩
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Thulium/ytterbium-doped yttrium vanadate particles provide a ratiometric thermal response as both colloids and powders via downshift or upconversion emissions. Here, we synthesized yttrium vanadate...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab29ee3bfb6a9b01a48cb8cff62f9d27
https://doi.org/10.1021/acs.jpcc.8b12251

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Trapping of rare earth-doped nanorods using quasi Bessel beam optical fiber tweezers

Autor: Aashutosh Kumar, Thierry Gacoin, U. Tiwari, R. A. Minz, Jochen Fick, S. Nic Chormaic, Khalid Lahlil, Samir K. Mondal

Publikováno v: OSA Continuum
OSA Continuum, OSA Publishing, 2021, 4 (2), pp.364-373. ⟨10.1364/OSAC.417151⟩

We demonstrate optical trapping of rare earth-doped NaYF4:Er/Yb nanorods of high aspect ratio (length 1.47 μm and diameter 140 nm) using a quasi Bessel beam (QBB) generated by positive axicon optical fiber tips. Propulsion or trapping of the nanorod

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2528569fc5ff4ab6e42f5d0bd0cc0de7
https://hal.archives-ouvertes.fr/hal-03120960/file/2021.Minz_OSAC.pdf

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Direction and polarization resolved spectroscopic investigation of optically trapped europium-doped nanorods (Conference Presentation)

Autor: Jochen Fick, Síle Nic Chormaic, Thierry Gacoin, Aashutosh Kumar, Jongwook Kim, Jeongmo Kim

Publikováno v: Nanophotonics VIII.

We report stable and reproducible optical trapping of Eu-doped NaYF4 anisotropic nanorods using single fiber tip optical tweezers for investigating the orientation resolved emission spectra. The nanorods were elaborated by the hydrothermal process fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d9a4952a8b2a00894af1449f0c66c4dc
https://doi.org/10.1117/12.2560328

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Improved optical fiber tweezers using 3D printed Fresnel lenses (Conference Presentation)

Autor: Jochen Fick, Simon Thiele, Asa Asadollahbaik, Florian Sterl, Ksenia Weber, Alois Herkommer, Aashutosh Kumar, Harald Giessen, Johannes Drozella

Publikováno v: Nanophotonics VIII.

A new approach of a highly efficient counter propagating optical fiber based tweezers using 3D printed Fresnel lenses at the fiber facets will be presented. In contrast to conventional fiber tip tweezers the emitted beams of the Fresnel lens fibers a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::193714c52d344e2b85992f555040c935
https://doi.org/10.1117/12.2559875

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Point-and-play: Fiber optic nano-antenna for excitation and collection of whispering gallery modes (Conference Presentation)

Autor: Síle Nic Chormaic, Fuchuan Lei, Stephy Vincent, Jonathan M. Ward, Samir K. Mondal, Pooj Gupta, Jochen Fick

Publikováno v: Laser Resonators, Microresonators, and Beam Control XXII.

We propose and experimentally demonstrate an alternative WGR coupling scheme that is easy to make, requires little alignment, and is both convenient and stable with no need for phase matching. It relies on cavity enhanced Rayleigh scattering. This is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::de49cb5c4d7097fecc3cb4bccd88d5cd
https://doi.org/10.1117/12.2545417

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Highly Efficient Dual-Fiber Optical Trapping with 3D Printed Diffractive Fresnel Lenses

Autor: Jochen Fick, Ksenia Weber, Asa Asadollahbaik, Florian Sterl, Alois Herkommer, Harald Giessen, Aashutosh Kumar, Johannes Drozella, Simon Thiele

Publikováno v: ACS photonics
ACS photonics, American Chemical Society, 2019, 7 (1), pp.88-97. ⟨10.1021/acsphotonics.9b01024⟩
ACS Photonics

Highly efficient counter-propagating fiber-based optical traps are presented which utilize converging beams from fibers with 3D printed diffractive Fresnel lenses on their facet. The use of a conve...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1f17bf153f52bf3b6f1e078b4974d2f
https://hal.archives-ouvertes.fr/hal-02464701

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