Ashleigh K. Wilson

Lawrence Livermore National Laboratory

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НН

Н. Ногинова

Norfolk State University

Sam Jeppson

Lawrence Livermore National Laboratory

Audrey Eshun

Lawrence Livermore National Laboratory

Tiziana C. Bond

Lawrence Livermore National Laboratory

Shervin Kiannejad

Lawrence Livermore National Laboratory

Ted A. Laurence

Lawrence Livermore National Laboratory

Edoardo Charbon

École Polytechnique Fédérale de Lausanne

Brandon Demory

Lawrence Livermore National Laboratory

Claudio Bruschini

École Polytechnique Fédérale de Lausanne

Dominique Davenport

Lawrence Livermore National Laboratory

Cooperative Institutions

Norfolk State University

Lawrence Livermore National Laboratory

École Polytechnique Fédérale de Lausanne

University of Michigan–Ann Arbor

Argonne National Laboratory

BioSurfaces (United States)

Massachusetts Institute of Technology

California Institute of Technology

New York Medical College

University of California, Berkeley

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Probing Charge Transport Kinetics in a Plasmonic Environment with Cyclic Voltammetry

ACS Omega (2021)

Mohammad Shahabuddin Ashleigh K. Wilson Ashah C. Koech Н. Ногинова

Possible modifications in electrochemical reaction kinetics are explored in a nanostructured plasmonic environment with and without additional light illumination using a cyclic voltammetry (CV) method. In nanostructured gold, the effect of light on anodic and cathodic currents is much pronounced than that in a flat system. The electron-transfer rate shows a 3-fold increase under photoexcitation. The findings indicate a possibility of using plasmonic excitations for controlling electrochemical reactions.

Photoexcitation

Electrochemical kinetics

Photocurrent

10.1021/acsomega.1c03794

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Quantum ghost imaging microscopy depth-of-field study

Optics Express (2024)

Dominique Davenport Audrey Eshun Brandon Demory Shervin Kiannejad Paul Mos

Quantum ghost imaging approaches have been proposed to enhance biological microscopy, for example, using 2D visible detectors to provide IR images or providing additional dimensions of spatial or spectral information. Toward the goal of making such imaging schemes practical, we compare image quality and depth-of-field between traditional images and ghost images at the same excitation levels. We measure how image quality and depth-of-field depend on the parameters of the entangled light produced using type-I spontaneous parametric down-conversion (SPDC). We use a pair of time-synchronized, photon-timing single-photon avalanche diode (SPAD) array detectors to capture two distinct microscope imaging paths simultaneously on a photon-pair-by-photon-pair basis: one in a traditional imaging pathway and the other a quantum ghost imaging pathway. We calculate the depth-of-field, resolution, contrast, and signal-to-noise ratio (SNR) through the parameter space of a β-Barium Borate (BBO) type-I bulk non-linear crystal length and angle. Our results provide a basis for choosing parameters for quantum ghost imaging with type-I SPDC sources.

Ghost Imaging

Quantum imaging

10.1364/oe.535325

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Quantum ghost imaging microscopy depth-of-field study

Dominique Davenport Audrey Eshun Brandon Demory Shervin Kiannejad Paul Mos

Quantum ghost imaging approaches have been proposed to enhance biological microscopy, for example using 2D visible detectors to provide IR images or providing additional dimensions of spatial or spectral information. Toward the goal of making such imaging schemes practical, we compare image quality and depth-of-field between traditional images and ghost images at the same excitation levels. We measure how image quality and depth-of-field depend on the parameters of the entangled light produced using type-1 spontaneous parametric down-conversion (SPDC). We use a pair of time-synchronized, photon-timing single-photon avalanche diode (SPAD) array detectors to capture two distinct microscope imaging paths simultaneously on a photon-pair-by-photon-pair basis: one in a traditional imaging pathway and the other a quantum ghost imaging pathway. We calculate the depth of field, resolution, contrast and signal-to-noise ratio (SNR) through the parameter space of a BBO type-1 bulk non-linear crystal length and angle. Our results provide a basis for choosing parameters for quantum ghost imaging with type-1 SPDC sources.<p></p>

Depth of field

Ghost Imaging

10.1364/opticaopen.26524138.v1

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Effect of electrochromic polymer switching on surface plasmon polaritons

Ashleigh K. Wilson Paula Fortuno Mohammad Shahabuddin Н. Ногинова

Electrochromic polymers incorporated into plasmonic systems provide a possibility to control plasmonic properties with the applied voltage. Using gold-polyaniline (PANI) bilayers, we study the effect of coloration switching on surface plasmon polaritons propagating at the PANI-gold interface. The width of the resonance, magnitude of the plasmon wave-vector and dielectric permittivity of PANI are estimated as the function of the applied voltage.

10.1117/12.2633586

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Fluorescence lifetime measurements using photon pair correlations generated via spontaneous parametric down conversion (SPDC)

Optics Express (2023)

Audrey Eshun Xiyu Yi Ashleigh K. Wilson Sam Jeppson Jae‐Hyuck Yoo

We have used photon pair correlations generated via spontaneous parametric downconversion (SPDC) to measure the fluorescence lifetime of the organic dye rhodamine 6 G, demonstrating that fluorescence lifetime measurements can be achieved using a continuous wave (CW) laser, without pulsed or modulated lasers. Our entangled photon method, quantum fluorescence lifetime (Q-FL) measurements, uses one photon to excite fluorescence and the resulting fluorescence photon is timed and referenced to the arrival time of the other entangled photon. Thus, we can exploit the short timescale of photon pair correlations to conduct experiments that are typically carried out with pulsed lasers and we show that the inherent timing of the photons is fast enough to resolve the nanosecond scale fluorescence lifetime of the sample. This measurement paves the way towards using the time correlations of entangled photons for fluorescence imaging; capitalizing on the presence of fast, sub-100 ps correlations that have not been demonstrated classically.

Nanosecond

Photon Counting

Photon entanglement

Fluorescence Correlation Spectroscopy

Spontaneous parametric down-conversion

10.1364/oe.494744

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Quantum ghost imaging microscopy depth-of-field study

Dominique Davenport Audrey Eshun Brandon Demory Shervin Kiannejad Paul Mos

Depth of field

10.1364/opticaopen.26524138

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Additional Cover

Chirality (2022)

Anastasia Visheratina Leila Hesami Ashleigh K. Wilson Nicole Baalbaki Н. Ногинова

The cover image is based on the Research Article Hydrothermal synthesis of chiral carbon dots by Anastasia Visheratina et al., https://doi.org/10.1002/chir.23509.

Carbon fibers

10.1002/chir.23519

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Bright magnetic dipole emission in Langmuir-Blodgett monolayers and its control with plasmonics

Ashleigh K. Wilson John Munga Chi Yang Ezekiel Mills Terence Baker

10.1117/12.3033651

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Effect on SPPs when incorporating an electrochromic polymer with metamaterials

Ashleigh K. Wilson Paula Fortuno Н. Ногинова Mohammad Shahabuddin

10.1021/scimeetings.3c01332

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Fluorescence Lifetime Measurements Using Entangled-Photon Coincidences

Audrey Eshun Xiyu Yi Ashleigh K. Wilson Sam Jeppson Shervin Kiannejad

We have utilized entangled photon pair coincidences to measure the fluorescence lifetime of the organic dye Rhodamine 6G, allowing lifetime measurements to be conducted at low intensities with a CW laser and without ultrafast pulsed lasers.

Rhodamine 6G

Rhodamine

Photon entanglement

10.1364/cleo_at.2023.jth2a.34

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