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Submissions from 2021

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Front Cover Artwork: Nano-Optical Tweezers: Methods and Applications for Trapping Single Molecules and Nanoparticles, Joshua D. Kolbow, Nathan C. Lindquist, Christopher T. Ertsgaard, Daehan Yoo, and Sang Hyun Oh
The front cover artwork is provided by Prof. Sang-Hyun Oh's group at the University of Minnesota. The image shows the optical trapping of chiral nanoparticles using coaxial nano-optical tweezers, devices capable of harnessing light to manip...

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Nano-Optical Tweezers: Methods and Applications for Trapping Single Molecules and Nanoparticles, Joshua D. Kolbow, Nathan C. Lindquist, Christopher T. Ertsgaard, Daehan Yoo, and Sang Hyun Oh
Optical tweezers were developed in 1970 by Arthur Ashkin as a tool for the manipulation of micron-sized particles. Ashkin's original design was then adapted for a variety of purposes, such as trapping and manipulation of biological material...

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Ultra-High-Speed Dynamics in Surface-Enhanced Raman Scattering, Nathan C. Lindquist and Alexandre G. Brolo
In this perspective, we discuss recent observations related to the temporal dynamics of intensities in surface-enhanced Raman scattering (SERS) experiments. SERS is a well-established and highly active research field, driven by the potentia...

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Digital plasmonic holography with iterative phase retrieval for sensing, RYAN M. SPIES, GRACE H. COLE, MARIT A. ENGEVIK, BRITTA G. NORDBERG, EVAN A. SCHARNICK, ISAAC M. VLIEM, ALEXANDRE G. BROLO, and NATHAN C. LINDQUIST
Propagating surface plasmon waves have been used for many applications including imaging and sensing. However, direct in-plane imaging of micro-objects with surface plasmon waves suffers from the lack of simple, two-dimensional lenses, mirr...

Submissions from 2020

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High-Speed Fluctuations in Surface-Enhanced Raman Scattering Intensities from Various Nanostructures, Ariadne T. Bido, Britta G. Nordberg, Marit A. Engevik, Nathan C. Lindquist, and Alexandre G. Brolo
The observation of single molecule events using surface-enhanced Raman scattering (SERS) is a well-established phenomenon. These events are characterized by strong fluctuations in SERS intensities. High-speed SERS intensity fluctuations (in...

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Dynamic Imaging of Multiple SERS Hotspots on Single Nanoparticles, Carlos Diego L. De Albuquerque, Kallai M. Hokanson, Sarah R. Thorud, Regivaldo G. Sobral-Filho, Nathan C. Lindquist, and Alexandre G. Brolo
Signal intensity fluctuations are a ubiquitous characteristic of single-molecule surface-enhanced Raman scattering (SERS). In this work, we observed SERS intensity fluctuations (SIFs) from single nanoparticles fully coated with an adsorbate...

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Digital plasmonic holography with iterative phase retrieval for sensing, Ryan M. Spies, Isaac M. Vliem, Alexandre G. Brolo, and Nathan C. Lindquist
Digital holographic microscopy techniques are combined with leakage radiation microscopy and used for lens-less in-plane surface imaging with propagating surface plasmon waves. Using iterative phase retrieval techniques, applications in pla...

Submissions from 2019

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High-speed imaging of surface-enhanced Raman scattering fluctuations from individual nanoparticles, Nathan C. Lindquist, Carlos Diego L. de Albuquerque, Regivaldo G. Sobral-Filho, Irina Paci, and Alexandre G. Brolo
The concept of plasmonic hotspots is central to the interpretation of the surface-enhanced Raman scattering (SERS) effect. Although plasmonic hotspots are generally portrayed as static features, single-molecule SERS (SM-SERS) is marked by c...

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Real-Time Sensing with Patterned Plasmonic Substrates and a Compact Imager Chip, Spencer T. Seiler, Isabel S. Rich, and Nathan C. Lindquist
Optical sensing is an important research field due to its proven ability to be extremely sensitive, nondestructive, and applicable to sensing a wide range of chemical, thermal, electric, or magnetic phenomena. Beyond traditional optical sen...

Submissions from 2018

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Holographic plasmonic tweezing for dynamic trapping and manipulation, Preston R. Huft, Joshua D. Kolbow, Jonathan T. Thweatt, John J. McCauley, and Nathan C. Lindquist
We demonstrate dynamic trapping and computer-controlled manipulation of nanoparticles with plasmonic holograms. Research into plasmonic trapping has been motivated by its potential for enhanced optical forces. However, while holographic opt...

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Digital plasmonic holography, Joseph W. Nelson, Greta R. Knefelkamp, Alexandre G. Brolo, and Nathan C. Lindquist
Direct two-dimensional imaging with surface plasmons suffers from the lack of simple two-dimensional lenses. Here we show that digital holographic microscopy techniques can be used for lens-less in-plane surface imaging with propagating pla...

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Digital plasmonic holography, Joseph W. Nelson, Greta R. Knefelkamp, Alexandre G. Brolo, and Nathan C. Lindquist
We demonstrate digital plasmonic holography for direct in-plane imaging with propagating surface-plasmon waves. Imaging with surface plasmons suffers from the lack of simple in-plane lenses and mirrors. Lens-less digital holography techniqu...

Submissions from 2017

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Holographic Plasmonic Nanotweezers for Dynamic Trapping and Manipulation, Preston R. Huft, Joshua D. Kolbow, Jonathan T. Thweatt, and Nathan C. Lindquist
We demonstrate dynamic trapping and manipulation of nanoparticles with plasmonic holograms. By tailoring the illumination pattern of an incident light beam with a computer-controlled spatial light modulator, constructive and destructive int...

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Chemically imaging bacteria with super-resolution SERS on ultra-thin silver substrates, Aeli P. Olson, Kelsey B. Spies, Anna C. Browning, Paula A.G. Soneral, and Nathan C. Lindquist
Plasmonic hotspots generate a blinking Surface Enhanced Raman Spectroscopy (SERS) effect that can be processed using Stochastic Optical Reconstruction Microscopy (STORM) algorithms for super-resolved imaging. Furthermore, by imaging through...

Submissions from 2016

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Split-Wedge Antennas with Sub-5 nm Gaps for Plasmonic Nanofocusing, Xiaoshu Chen, Nathan C. Lindquist, Daniel J. Klemme, Prashant Nagpal, David J. Norris, and Sang Hyun Oh
We present a novel plasmonic antenna structure, a split-wedge antenna, created by splitting an ultrasharp metallic wedge with a nanogap perpendicular to its apex. The nanogap can tightly confine gap plasmons and boost the local optical fiel...

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Super-Resolution Chemical Imaging with Plasmonic Substrates, Aeli P. Olson, Christopher T. Ertsgaard, Sarah N. Elliott, and Nathan C. Lindquist
We demonstrate super-resolution chemical imaging with plasmonic nanoholes via surface-enhanced Raman spectroscopy (SERS). Due to large field enhancements, blinking behavior of SERS hot spots was observed and processed using a stochastic opt...

Super-resolution snapshot chemical imaging with plasmonic nanoholes, Aeli P. Olson and Nathan C. Lindquist
We show super-resolution chemical imaging with plasmonic nanoholes, Surface Enhanced Raman Spectroscopy and Stochastic Optical Reconstruction Microscopy. Spectral and spatial content are obtained simultaneously by imaging through filters or...

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Super-resolution snapshot chemical imaging with plasmonic nanoholes, Aeli P. Olson and Nathan C. Lindquist
We show super-resolution chemical imaging with plasmonic nanoholes, Surface Enhanced Raman Spectroscopy and Stochastic Optical Reconstruction Microscopy. Spectral and spatial content are obtained simultaneously by imaging through filters or...

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Direct spectral imaging of plasmonic nanohole arrays for real-time sensing, Spencer T. Seiler, Isabel S. Rich, and Nathan C. Lindquist
Plasmon-enhanced optical transmission through arrays of nano-structured holes has led to the development of a new generation of optical sensors. In this paper, to dramatically simplify the standard optical setups of these sensors, we positi...

Submissions from 2015

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Super-resolution chemical imaging with dynamic placement of plasmonic hotspots, Aeli P. Olson, Christopher T. Ertsgaard, Rachel M. McKoskey, Isabel S. Rich, and Nathan C. Lindquist
We demonstrate dynamic placement of plasmonic "hotspots" for super-resolution chemical imaging via Surface Enhanced Raman Spectroscopy (SERS). A silver nanohole array surface was coated with biological samples and illuminated with a laser. ...

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Polarization interferometry for real-time spectroscopic plasmonic sensing, Lauren M. Otto, Daniel A. Mohr, Timothy W. Johnson, Sang Hyun Oh, and Nathan C. Lindquist
We present quantitative, spectroscopic polarization interferometry phase measurements on plasmonic surfaces for sensing applications. By adding a liquid crystal variable wave plate in our beam path, we are able to measure phase shifts due t...

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Perfect Extinction of Terahertz Waves in Monolayer Graphene over 2-nm-Wide Metallic Apertures, Hyeong Ryeol Park, Seon Namgung, Xiaoshu Chen, Nathan C. Lindquist, Vincenzo Giannini, Yan Francescato, Stefan A. Maier, and Sang Hyun Oh
High carrier mobility and tunability in graphene enable fundamental studies for plasmonics and various applications. Despite its versatility, however, single-layer graphene (SLG) suffers from poor coupling efficiency to electromagnetic wave...

Submissions from 2014

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Squeezing millimeter waves through a single, nanometer-wide, centimeter-long slit, Xiaoshu Chen, Hyeong Ryeol Park, Nathan C. Lindquist, Jonah Shaver, Matthew Pelton, and Sang Hyun Oh
We demonstrate broadband non-resonant squeezing of terahertz (THz) waves through an isolated 2-nm-wide, 2-cm-long slit (aspect ratio of 107), representing a maximum intensity enhancement factor of one million. Unlike resonant nanogap struct...

Fabrication and characterization of template-stripped plasmonic substrates for high-resolution chemical imaging, Sarah Elliott, Mark Turner, Isabel Rich, and Nathan C. Lindquist
Template-stripped plasmonic nanoholes are used as high-resolution chemical imaging substrates via surface-enhanced Raman spectroscopy. Chemical patterns created with microcontact printing show these surfaces to provide large and uniform enh...

Fabrication and characterization of template-stripped plasmonic substrates for high-resolution chemical imaging, Sarah Elliott, Mark Turner, Isabel Rich, and Nathan C. Lindquist
Template-stripped plasmonic nanoholes are used as high-resolution chemical imaging substrates via surface-enhanced Raman spectroscopy. Chemical patterns created with microcontact printing show these surfaces to provide large and uniform enh...

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Fabrication and characterization of template-stripped plasmonic substrates for high-resolution chemical imaging, Sarah Elliott, Mark Turner, Isabel Rich, and Nathan C. Lindquist
Template-stripped plasmonic nanoholes are used as high-resolution chemical imaging substrates via surface-enhanced Raman spectroscopy. Chemical patterns created with microcontact printing show these surfaces to provide large and uniform enh...

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Fabrication and Characterization of Template-Stripped Plasmonic Substrates for High-Resolution Chemical Imaging, Sarah Elliott, Mark Turner, Isabel Rich, and Nathan C. Lindquist
Template-stripped plasmonic nanoholes are used as high-resolution chemical imaging substrates via surface-enhanced Raman spectroscopy. Chemical patterns created with microcontact printing show these surfaces to provide large and uniform enh...

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Dynamic placement of plasmonic hotspots for super-resolution surface-enhanced Raman scattering, Christopher T. Ertsgaard, Rachel M. McKoskey, Isabel S. Rich, and Nathan C. Lindquist
In this paper, we demonstrate dynamic placement of locally enhanced plasmonic fields using holographic laser illumination of a silver nanohole array. To visualize these focused "hotspots", the silver surface was coated with various biologic...

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Template fabricated plasmonic nanoholes on analyte-sensitive substrates for real-time vapor sensing, Nathan C. Lindquist, Mark A. Turner, and Benjamin P. Heppner
Sensing with nanostructured plasmonic devices has become an important research field due to their proven ability to be extremely sensitive, compact, multiplexed, and compatible with low-cost fabrication techniques. In this paper, we employ ...

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Super-resolution snapshot chemical imaging with plasmonic nanoholes, Aeli P. Olson and Nathan C. Lindquist
We show super-resolution chemical imaging with plasmonic nanoholes, Surface Enhanced Raman Spectroscopy and Stochastic Optical Reconstruction Microscopy. Spectral and spatial content are obtained simultaneously by imaging through filters or...

Template fabricated plasmonic nanoholes on analyte-sensitive substrates for vapor sensing, Mark Turner, Benjamin Heppner, Isabel Rich, and Nathan C. Lindquist
Template-stripping is used to produce plasmonic nanoholes on chemically-patterned substrates for real-time, multiplex vapor sensing. The open-hole geometry allows simultaneous response from both sides of the chip during exposure to nitrogen...

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Template fabricated plasmonic nanoholes on analyte-sensitive substrates for vapor sensing, Mark Turner, Benjamin Heppner, Isabel Rich, and Nathan C. Lindquist
Template-stripping is used to produce plasmonic nanoholes on chemically-patterned substrates for real-time, multiplex vapor sensing. The open-hole geometry allows simultaneous response from both sides of the chip during exposure to <10 ppm ...