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  1. Article ; Online: Integrated enhanced Raman scattering: a review.

    Eslami, Sahand / Palomba, Stefano

    Nano convergence

    2021  Volume 8, Issue 1, Page(s) 41

    Abstract: The demand for effective, real-time environmental monitoring and for customized point-of-care (PoC) health, requires the ability to detect low molecular concentrations, using portable, reliable and cost-effective devices. However, traditional techniques ... ...

    Abstract The demand for effective, real-time environmental monitoring and for customized point-of-care (PoC) health, requires the ability to detect low molecular concentrations, using portable, reliable and cost-effective devices. However, traditional techniques often require time consuming, highly technical and laborious sample preparations, as well as expensive, slow and bulky instrumentation that needs to be supervised by laboratory technicians. Consequently, fast, compact, self-sufficient, reusable and cost-effective lab-on-a-chip (LOC) devices, which can perform all the required tasks and can then upload the data to portable devices, would revolutionize any mobile sensing application by bringing the testing device to the field or to the patient. Integrated enhanced Raman scattering devices are the most promising platform to accomplish this vision and to become the basic architecture for future universal molecular sensors and hence an artificial optical nose. Here we are reviewing the latest theoretical and experimental work along this direction.
    Language English
    Publishing date 2021-12-03
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2760386-6
    ISSN 2196-5404 ; 2196-5404
    ISSN (online) 2196-5404
    ISSN 2196-5404
    DOI 10.1186/s40580-021-00290-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Radially and Azimuthally Pure Vortex Beams from Phase-Amplitude Metasurfaces.

    de Oliveira, Michael / Piccardo, Marco / Eslami, Sahand / Aglieri, Vincenzo / Toma, Andrea / Ambrosio, Antonio

    ACS photonics

    2023  Volume 10, Issue 1, Page(s) 290–297

    Abstract: To exploit the full potential of the transverse spatial structure of light using the Laguerre-Gaussian basis, it is necessary to control the azimuthal and radial components of the photons. Vortex phase elements are commonly used to generate these modes ... ...

    Abstract To exploit the full potential of the transverse spatial structure of light using the Laguerre-Gaussian basis, it is necessary to control the azimuthal and radial components of the photons. Vortex phase elements are commonly used to generate these modes of light, offering precise control over the azimuthal index but neglecting the radially dependent amplitude term, which defines their associated corresponding transverse profile. Here, we experimentally demonstrate the generation of high-purity Laguerre-Gaussian beams with a single-step on-axis transformation implemented with a dielectric phase-amplitude metasurface. By vectorially structuring the input beam and projecting it onto an orthogonal polarization basis, we can sculpt any vortex beam in phase and amplitude. We characterize the azimuthal and radial purities of the generated vortex beams, reaching a purity of 98% for a vortex beam with
    Language English
    Publishing date 2023-01-04
    Publishing country United States
    Document type Journal Article
    ISSN 2330-4022
    ISSN 2330-4022
    DOI 10.1021/acsphotonics.2c01697
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Book ; Online ; Thesis: Chiral metamaterials

    Eslami, Sahand [Verfasser] / Fischer, Peer [Akademischer Betreuer]

    2016  

    Author's details Sahand Eslami ; Betreuer: Peer Fischer
    Keywords Naturwissenschaften ; Science
    Subject code sg500
    Language English
    Publisher Universitätsbibliothek der Universität Stuttgart
    Publishing place Stuttgart
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

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  4. Article ; Online: Nanohelices by shadow growth.

    Gibbs, John G / Mark, Andrew G / Lee, Tung-Chun / Eslami, Sahand / Schamel, Debora / Fischer, Peer

    Nanoscale

    2014  Volume 6, Issue 16, Page(s) 9457–9466

    Abstract: The helix has remarkable qualities and is prevalent in many fields including mathematics, physics, chemistry, and biology. This shape, which is chiral by nature, is ubiquitous in biology with perhaps the most famous example being DNA. Other naturally ... ...

    Abstract The helix has remarkable qualities and is prevalent in many fields including mathematics, physics, chemistry, and biology. This shape, which is chiral by nature, is ubiquitous in biology with perhaps the most famous example being DNA. Other naturally occurring helices are common at the nanoscale in the form of protein secondary structures and in various macromolecules. Nanoscale helices exhibit a wide range of interesting mechanical, optical, and electrical properties which can be intentionally engineered into the structure by choosing the correct morphology and material. As technology advances, these fabrication parameters can be fine-tuned and matched to the application of interest. Herein, we focus on the fabrication and properties of nanohelices grown by a dynamic shadowing growth method combined with fast wafer-scale substrate patterning which has a number of distinct advantages. We review the fabrication methodology and provide several examples that illustrate the generality and utility of nanohelices shadow-grown on nanopatterns.
    Language English
    Publishing date 2014-08-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/c4nr00403e
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Active Nanorheology with Plasmonics.

    Jeong, Hyeon-Ho / Mark, Andrew G / Lee, Tung-Chun / Alarcón-Correa, Mariana / Eslami, Sahand / Qiu, Tian / Gibbs, John G / Fischer, Peer

    Nano letters

    2016  Volume 16, Issue 8, Page(s) 4887–4894

    Abstract: Nanoplasmonic systems are valued for their strong optical response and their small size. Most plasmonic sensors and systems to date have been rigid and passive. However, rendering these structures dynamic opens new possibilities for applications. Here we ...

    Abstract Nanoplasmonic systems are valued for their strong optical response and their small size. Most plasmonic sensors and systems to date have been rigid and passive. However, rendering these structures dynamic opens new possibilities for applications. Here we demonstrate that dynamic plasmonic nanoparticles can be used as mechanical sensors to selectively probe the rheological properties of a fluid in situ at the nanoscale and in microscopic volumes. We fabricate chiral magneto-plasmonic nanocolloids that can be actuated by an external magnetic field, which in turn allows for the direct and fast modulation of their distinct optical response. The method is robust and allows nanorheological measurements with a mechanical sensitivity of ∼0.1 cP, even in strongly absorbing fluids with an optical density of up to OD ∼ 3 (∼0.1% light transmittance) and in the presence of scatterers (e.g., 50% v/v red blood cells).
    Language English
    Publishing date 2016-07-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.6b01404
    Database MEDical Literature Analysis and Retrieval System OnLINE

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