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  1. AU="Krauss, Thomas F"
  2. AU="Papoulidis, Ioannis"
  3. AU="Migaud, Henri"
  4. AU="Kelion, Andrew"
  5. AU="Harry Jabs"
  6. AU="Patel, Yatindra"
  7. AU="Aziza Jamal-Allial"
  8. AU="Montiel, Olga Martha"
  9. AU="Pérez Latorre, Leire"
  10. AU=Vardhan Seshu
  11. AU="OJ Baker"
  12. AU="Dalton, R C"
  13. AU="Mrozikiewicz-Rakowska, Beata"
  14. AU="Penkert, Judith"
  15. AU="Mak, Susanna"
  16. AU="Karkoszka, Henryk"
  17. AU="Burton, Jeffrey H"
  18. AU="Frederique Pitel"
  19. AU="Pierce, Aimee"
  20. AU="Luque-Ballesteros, Laura"
  21. AU="Dondi, Francesco"
  22. AU="McLachlan, Alex"
  23. AU="Krizova, Ludmila"
  24. AU="Balog, Attila"
  25. AU="Faerber, Karin"
  26. AU="Prettner, Klaus"
  27. AU="Ambrožová, I."
  28. AU="William, Doreen"
  29. AU="Gutiérrez-Sánchez, A M"
  30. AU="Bohan, Dana"
  31. AU="Spracklen, D."
  32. AU="Lobo, Brian C"
  33. AU=Zhuang Jianjian AU=Zhuang Jianjian
  34. AU=Pathanki Adithya M
  35. AU="Armando Vilchis-Ordoñez"
  36. AU="Zhongfu Lu"
  37. AU="Lo, Hong-Yip"
  38. AU="Ziman Xiong"
  39. AU="Oakes, Allison H"
  40. AU="Ma, Shaotong"
  41. AU="Zang, Lili"
  42. AU="Adams Brian D"
  43. AU="Maria Papaioannou"
  44. AU="Kollia, Georgia"
  45. AU="Auxiette, Catherine"
  46. AU="Guzmán, Luis"
  47. AU="Alipour, Elnaz"
  48. AU="Queiroz, Dayanna Joyce Marques"
  49. AU="Ramamurthy, Santosh"
  50. AU="Xueying Huang"
  51. AU="Cromwell, Howard C"
  52. AU="Spence, John C H"
  53. AU="Chapinal, Libertad"
  54. AU=Rohaim Mohammed A AU=Rohaim Mohammed A
  55. AU=Hempel Cornelius

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Treffer 1 - 10 von insgesamt 111

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  1. Artikel ; Online: On the reproducibility of electron-beam lithographic fabrication of photonic nanostructures.

    Sahoo, Pankaj K / Coates, Eve / Silver, Callum D / Li, Kezheng / Krauss, Thomas F

    Scientific reports

    2024  Band 14, Heft 1, Seite(n) 8703

    Abstract: Photonic nanostructures such as gratings and ring resonators have become ubiquitous building blocks in Photonics. For example, they are used in filters, they resonantly enhance signals and act as grating couplers. Much research effort is invested in ... ...

    Abstract Photonic nanostructures such as gratings and ring resonators have become ubiquitous building blocks in Photonics. For example, they are used in filters, they resonantly enhance signals and act as grating couplers. Much research effort is invested in using such structures to create novel functionalities, which often employs electron-beam lithography. An intrinsic issue in this field is the ability to accurately achieve a specific operating wavelength, especially for resonant systems, because nanometer-scale variations in feature size may easily detune the device. Here, we examine some of the key fabrication steps and show how to improve the reproducibility of fabricating wavelength scale photonic nanostructures. We use guided mode resonance grating sensors as our exemplar and find that the exposure condition and the development process significantly affect the consistency of the resonance wavelength, amplitude, and sensitivity of the sensor. By having careful control over these factors, we can achieve consistent performance for all the sensors studied, with less than 10% variation in their resonance behaviors. These investigations provide useful guidelines for fabricating nanostructures more reliably and to achieve a higher success rate in exploratory experiments.
    Sprache Englisch
    Erscheinungsdatum 2024-04-15
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-58842-w
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  2. Artikel ; Online: Photonic crystals umbrella for thermal desalination: simulation study.

    Sayed, Hassan / Aly, Arafa H / Krauss, Thomas F

    Scientific reports

    2022  Band 12, Heft 1, Seite(n) 21499

    Abstract: For sustainable water desalination, there is a worldwide push towards solar thermal desalination with the objective to limit the amount of consumed energy in other desalination technologies and maximize the resulting freshwater from saline water. Here, ... ...

    Abstract For sustainable water desalination, there is a worldwide push towards solar thermal desalination with the objective to limit the amount of consumed energy in other desalination technologies and maximize the resulting freshwater from saline water. Here, we demonstrate a photonic crystals solar umbrella that covers the saline water surface, demanding to absorb all the incident electromagnetic wave and remit it as greater wavelengths in the range of mid-infrared (MIR) to be highly absorbed and localized close to the water surface. The temperature of the saline water with a refractive index of 1.3326 is reached to [Formula: see text] after one hour of illumination with the incident power intensity equal 680 [Formula: see text]. Hence, by adding one-dimensional PCs the surface temperature is reached [Formula: see text]. Also, by adding 2D PCs to allow the vapor to flow up through the pores of the structure with the diameter of the pore equal to 500 nm, the surface temperature is reached [Formula: see text] after three hour of illumination. Thus, the effective use of electromagnetic waves and warmth localization at the surface of saline water is accomplished by radiative coupling with the effect of 2D PCs. We design the considered structure by using COMSOL multiphysics which based on the finite element method (FEM).
    Sprache Englisch
    Erscheinungsdatum 2022-12-13
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-24336-w
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  3. Artikel ; Online: Exploring the fundamental limit of antimicrobial susceptibility by near-single-cell electrical impedance spectroscopy.

    Pitruzzello, Giampaolo / Johnson, Steven / Krauss, Thomas F

    Biosensors & bioelectronics

    2022  Band 224, Seite(n) 115056

    Abstract: Many novel susceptibility tests are being developed to tackle the worldwide problem of antimicrobial resistance (AMR). The key driver behind these developments, that is the need to reduce the response time, requires an understanding of which bacterial ... ...

    Abstract Many novel susceptibility tests are being developed to tackle the worldwide problem of antimicrobial resistance (AMR). The key driver behind these developments, that is the need to reduce the response time, requires an understanding of which bacterial characteristic needs to be monitored to provide a rapid and ideally universal signature of susceptibility. Many characteristics have already been studied, most notably bacterial growth, metabolism and motility. Here, we consider electrical impedance to directly access bacterial metabolism, which can be considered a fundamental indicator of bacterial viability. By studying the electrical response of individual bacteria to an antibiotic challenge, we detect antimicrobial action close to its biological limit. Specifically, we find that it takes 30-60 min to register significant changes in impedance for clinical concentrations of antibiotics, in line with other rapid indicators. Our findings suggest that 60 min is the fundamental lower limit of response time for a realistic susceptibility test at clinically relevant antibiotic concentrations.
    Mesh-Begriff(e) Dielectric Spectroscopy ; Microbial Sensitivity Tests ; Biosensing Techniques ; Anti-Bacterial Agents/pharmacology ; Bacteria/chemistry
    Chemische Substanzen Anti-Bacterial Agents
    Sprache Englisch
    Erscheinungsdatum 2022-12-30
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1011023-9
    ISSN 1873-4235 ; 0956-5663
    ISSN (online) 1873-4235
    ISSN 0956-5663
    DOI 10.1016/j.bios.2022.115056
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  4. Artikel ; Online: Multiplexed Near-Field Optical Trapping Exploiting Anapole States.

    Conteduca, Donato / Brunetti, Giuseppe / Barth, Isabel / Quinn, Steven D / Ciminelli, Caterina / Krauss, Thomas F

    ACS nano

    2023  Band 17, Heft 17, Seite(n) 16695–16702

    Abstract: Optical tweezers have had a major impact on bioscience research by enabling the study of biological particles with high accuracy. The focus so far has been on trapping individual particles, ranging from the cellular to the molecular level. However, ... ...

    Abstract Optical tweezers have had a major impact on bioscience research by enabling the study of biological particles with high accuracy. The focus so far has been on trapping individual particles, ranging from the cellular to the molecular level. However, biology is intrinsically heterogeneous; therefore, access to variations within the same population and species is necessary for the rigorous understanding of a biological system. Optical tweezers have demonstrated the ability of trapping multiple targets in parallel; however, the multiplexing capability becomes a challenge when moving toward the nanoscale. Here, we experimentally demonstrate a resonant metasurface that is capable of trapping a high number of nanoparticles in parallel, thereby opening up the field to large-scale multiplexed optical trapping. The unit cell of the metasurface supports an anapole state that generates a strong field enhancement for low-power near-field trapping; importantly, the anapole state is also more angle-tolerant than comparable resonant modes, which allows its excitation with a focused light beam, necessary for generating the required power density and optical forces. We use the anapole state to demonstrate the trapping of 100's of 100 nm polystyrene beads over a 10 min period, as well as the multiplexed trapping of lipid vesicles with a moderate intensity of <250 μW/μm
    Sprache Englisch
    Erscheinungsdatum 2023-08-21
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.3c03100
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  5. Artikel: Photonic Characterisation of Indium Tin Oxide as a Function of Deposition Conditions.

    Blair, Samuel F J / Male, Joshua S / Cavill, Stuart A / Reardon, Christopher P / Krauss, Thomas F

    Nanomaterials (Basel, Switzerland)

    2023  Band 13, Heft 13

    Abstract: Indium tin oxide (ITO) has recently gained prominence as a photonic nanomaterial, for example, in modulators, tuneable metasurfaces and for epsilon-near-zero (ENZ) photonics. The optical properties of ITO are typically described by the Drude model and ... ...

    Abstract Indium tin oxide (ITO) has recently gained prominence as a photonic nanomaterial, for example, in modulators, tuneable metasurfaces and for epsilon-near-zero (ENZ) photonics. The optical properties of ITO are typically described by the Drude model and are strongly dependent on the deposition conditions. In the current literature, studies often make several assumptions to connect the optically measured material parameters to the electrical properties of ITO, which are not always clear, nor do they necessarily apply. Here, we present a comprehensive study of the structural, electrical, and optical properties of ITO and showed how they relate to the deposition conditions. We use guided mode resonances to determine the dispersion curves of the deposited material and relate these to structural and electrical measurements to extract all relevant material parameters. We demonstrate how the carrier density, mobility, plasma frequency, electron effective mass, and collision frequency vary as a function of deposition conditions, and that the high-frequency permittivity (ϵ∞) can vary significantly from the value of ϵ∞ = 3.9 that many papers simply assume to be a constant. The depth of analysis we demonstrate allows the findings to be easily extrapolated to the photonic characterisation of other transparent conducting oxides (TCOs), whilst providing a much-needed reference for the research area.
    Sprache Englisch
    Erscheinungsdatum 2023-06-30
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano13131990
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  6. Artikel ; Online: Perturbation approach to improve the angular tolerance of high-Q resonances in metasurfaces.

    Arruda, Guilherme S / Conteduca, Donato / Barth, Isabel / Wang, Yue / Krauss, Thomas F / Martins, Emiliano R

    Optics letters

    2023  Band 47, Heft 23, Seite(n) 6133–6136

    Abstract: The interest in high quality factor (high-Q) resonances in metasurfaces has been rekindled with the rise of the bound states in the continuum (BIC) paradigm, which describes resonances with apparently limitlessly high quality-factors (Q-factors). The ... ...

    Abstract The interest in high quality factor (high-Q) resonances in metasurfaces has been rekindled with the rise of the bound states in the continuum (BIC) paradigm, which describes resonances with apparently limitlessly high quality-factors (Q-factors). The application of BICs in realistic systems requires the consideration of the angular tolerance of resonances, however, which is an issue that has not yet been addressed. Here, we develop an ab-initio model, based on temporal coupled mode theory, to describe the angular tolerance of distributed resonances in metasurfaces that support both BICs and guided mode resonances (GMRs). We then discuss the idea of a metasurface with a perturbed unit cell, similar to a supercell, as an alternative approach for achieving high-Q resonances and we use the model to compare the two. We find that, while sharing the high-Q advantage of BIC resonances, perturbed structures feature higher angular tolerance due to band planarization. This observation suggests that such structures offer a route toward high-Q resonances that are more suitable for applications.
    Sprache Englisch
    Erscheinungsdatum 2023-05-23
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.475601
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  7. Artikel ; Online: Nanophotonic and hydrogel-based diagnostic system for the monitoring of chronic wounds.

    Bakshi, Shrishty / Sahoo, Pankaj K / Li, Kezheng / Johnson, Steven / Raxworthy, Michael J / Krauss, Thomas F

    Biosensors & bioelectronics

    2023  Band 242, Seite(n) 115743

    Abstract: Chronic wounds present a major healthcare burden, yet most wounds are only assessed superficially, and treatment is rarely based on the analysis of wound biomarkers. This lack of analysis is based on the fact that sampling of wound biomarkers is ... ...

    Abstract Chronic wounds present a major healthcare burden, yet most wounds are only assessed superficially, and treatment is rarely based on the analysis of wound biomarkers. This lack of analysis is based on the fact that sampling of wound biomarkers is typically invasive, leading to a disruption of the wound bed while biomarker detection and quantification is performed in a remote laboratory, away from the point of care. Here, we introduce the diagnostic element of a novel theranostic system that can non-invasively sample biomarkers without disrupting the wound and that can perform biomarker quantification at the point of care, on a short timescale. The system is based on a thermally switchable hydrogel scaffold that enhances wound healing through regeneration of the wound tissue and allows the extraction of wound biomarkers non-destructively. We demonstrate the detection of two major biomarkers of wound health, i.e., IL-6 and TNF-α, in human matrix absorbed into the hydrogel dressing. Quantification of the biomarkers directly in the hydrogel is achieved using a chirped guided mode resonant biosensor and we demonstrate biomarker detection within the clinically relevant range of pg/mL to μg/mL concentrations. We also demonstrate the detection of IL-6 and TNF-α at concentration 1 ng/mL in hydrogel dressing absorbed with clinical wound exudate samples. The high sensitivity and the wide dynamic range we demonstrate are both essential for the clinical relevance of our system. Our test makes a major contribution towards the development of a wound theranostic for guided treatment and management of chronic wounds.
    Mesh-Begriff(e) Humans ; Hydrogels ; Tumor Necrosis Factor-alpha ; Interleukin-6 ; Biosensing Techniques ; Biomarkers
    Chemische Substanzen Hydrogels ; Tumor Necrosis Factor-alpha ; Interleukin-6 ; Biomarkers
    Sprache Englisch
    Erscheinungsdatum 2023-10-06
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1011023-9
    ISSN 1873-4235 ; 0956-5663
    ISSN (online) 1873-4235
    ISSN 0956-5663
    DOI 10.1016/j.bios.2023.115743
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    Verfügbar in ZB MED Köln/Königswinter

    Zs.A 2275: Hefte anzeigen Standort:
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  8. Artikel: Phase noise matching in resonant metasurfaces for intrinsic sensing stability.

    Barth, Isabel / Conteduca, Donato / Dong, Pin / Wragg, Jasmine / Sahoo, Pankaj K / Arruda, Guilherme S / Martins, Emiliano R / Krauss, Thomas F

    Optica

    2024  Band 11, Heft 3, Seite(n) 354–361

    Abstract: Interferometry offers a precise means of interrogating resonances in dielectric and plasmonic metasurfaces, surpassing spectrometer-imposed resolution limits. However, interferometry implementations often face complexity or instability issues due to ... ...

    Abstract Interferometry offers a precise means of interrogating resonances in dielectric and plasmonic metasurfaces, surpassing spectrometer-imposed resolution limits. However, interferometry implementations often face complexity or instability issues due to heightened sensitivity. Here, we address the necessity for noise compensation and tolerance by harnessing the inherent capabilities of photonic resonances. Our proposed solution, termed "resonant phase noise matching," employs optical referencing to align the phases of equally sensitive, orthogonal components of the same mode. This effectively mitigates drift and noise, facilitating the detection of subtle phase changes induced by a target analyte through spatially selective surface functionalization. Validation of this strategy using Fano resonances in a 2D photonic crystal slab showcases noteworthy phase stability (
    Sprache Englisch
    Erscheinungsdatum 2024-03-08
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2779175-0
    ISSN 2334-2536
    ISSN 2334-2536
    DOI 10.1364/OPTICA.510524
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  9. Artikel ; Online: Photonics: Phased array on a fingertip.

    Krauss, Thomas F

    Nature

    2013  Band 493, Heft 7431, Seite(n) 170–171

    Sprache Englisch
    Erscheinungsdatum 2013-01-08
    Erscheinungsland England
    Dokumenttyp Comment ; News
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/493170a
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  10. Artikel: Metasurface-enhanced mid-infrared spectroscopy in the liquid phase.

    Kharratian, Soheila / Conteduca, Donato / Procacci, Barbara / Shaw, Daniel J / Hunt, Neil T / Krauss, Thomas F

    Chemical science

    2022  Band 13, Heft 43, Seite(n) 12858–12864

    Abstract: Vibrational spectroscopy is an important tool in chemical and biological analysis. A key issue when applying vibrational spectroscopy to dilute liquid samples is the inherently low sensitivity caused by short interaction lengths and small extinction ... ...

    Abstract Vibrational spectroscopy is an important tool in chemical and biological analysis. A key issue when applying vibrational spectroscopy to dilute liquid samples is the inherently low sensitivity caused by short interaction lengths and small extinction coefficients, combined with low target molecule concentrations. Here, we introduce a novel type of surface-enhanced infrared absorption spectroscopy based on the resonance of a dielectric metasurface. We demonstrate that the method is suitable for probing vibrational bands of dilute analytes with a range of spectral linewidths. We observe that the absorption signal is enhanced by 1-2 orders of magnitude and show that this enhancement leads to a lower limit of detection compared to attenuated total reflection (ATR). Overall, the technique provides an important addition to the spectroscopist's toolkit especially for probing dilute samples.
    Sprache Englisch
    Erscheinungsdatum 2022-10-21
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2559110-1
    ISSN 2041-6539 ; 2041-6520
    ISSN (online) 2041-6539
    ISSN 2041-6520
    DOI 10.1039/d2sc03927c
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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