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Librizzi P, Biswas A, Chang R, Kong XT, Moocarme M, Ahuja G, Kretzschmar I, Vuong LT. Broadband chiral hybrid plasmon modes on nanofingernail substrates. NANOSCALE 2020; 12:3827-3833. [PMID: 31995089 DOI: 10.1039/c9nr07394a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
There is significant interest in the utility of asymmetric nanoaperture arrays as substrates for the surface-enhanced detection, fluorescence, and imaging of individual molecules. This work introduces obliquely-cut, out-of-plane, coaxial layered structures on an aperture edge. We refer to these structures as nanofingernails, which emphasizes their curved, oblique, and out-of-plane features. Broadband coupling into chiral hybrid plasmon modes and helicity-dependent near-field scattering without circular dichroism are demonstrated. The unusually-broadband, multipolar modes of nanofingernail micropore structures exhibit phase retardation effects that may be useful for achieving spatial overlap at different frequencies. The nanofingernail geometry shows new potential for simultaneous polarization-enhanced hyperspectral imaging on apertured, plasmonic surfaces.
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Affiliation(s)
- Paulina Librizzi
- Department of Chemical Engineering, City College of New York of the City University of New York (CUNY), New York, New York 10031, USA.
| | - Aneek Biswas
- Department of Physics, Graduate Center of the City University of New York (CUNY), New York, New York 10016, USA. and Department of Physics, Queens College of the City University of New York (CUNY), Queens, New York 11367, USA
| | - Roger Chang
- Department of Chemical Engineering, City College of New York of the City University of New York (CUNY), New York, New York 10031, USA.
| | - Xiang-Tian Kong
- Department of Mechanical Engineering, Bourns Hall, University of California at Riverside, Riverside, California 92521, USA
| | - Matthew Moocarme
- Department of Physics, Graduate Center of the City University of New York (CUNY), New York, New York 10016, USA. and Department of Physics, Queens College of the City University of New York (CUNY), Queens, New York 11367, USA
| | - Gaurav Ahuja
- Department of Mechanical Engineering, Bourns Hall, University of California at Riverside, Riverside, California 92521, USA
| | - Ilona Kretzschmar
- Department of Chemical Engineering, City College of New York of the City University of New York (CUNY), New York, New York 10031, USA.
| | - Luat T Vuong
- Department of Physics, Graduate Center of the City University of New York (CUNY), New York, New York 10016, USA. and Department of Physics, Queens College of the City University of New York (CUNY), Queens, New York 11367, USA and Department of Mechanical Engineering, Bourns Hall, University of California at Riverside, Riverside, California 92521, USA
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Son T, Lee D, Lee C, Moon G, Ha GE, Lee H, Kwak H, Cheong E, Kim D. Superlocalized Three-Dimensional Live Imaging of Mitochondrial Dynamics in Neurons Using Plasmonic Nanohole Arrays. ACS NANO 2019; 13:3063-3074. [PMID: 30802028 DOI: 10.1021/acsnano.8b08178] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We investigated the transport of neuronal mitochondria using superlocalized near-fields with plasmonic nanohole arrays (PNAs). Compared to traditional imaging techniques, PNAs create a massive array of superlocalized light beams and allow 3D mitochondrial dynamics to be sampled and extracted almost in real time. In this work, mitochondrial fluorescence excited by the PNAs was captured by an optical microscope using dual objective lenses, which produced superlocalized dynamics while minimizing light scattering by the plasmonic substrate. It was found that mitochondria move with an average velocity 0.33 ± 0.26 μm/s, a significant part of which, by almost 50%, was contributed by the movement along the depth axis ( z-axis). Mitochondrial positions were acquired with superlocalized precision (σ x = 5.7 nm and σ y = 11.8 nm) in the lateral plane and σ z = 78.7 nm in the z-axis, which presents an enhancement by 12.7-fold in resolution compared to confocal fluorescence microscopy. The approach is expected to serve as a way to provide 3D information on molecular dynamics in real time.
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Crouch GM, Han D, Bohn PW. Zero-Mode Waveguide Nanophotonic Structures for Single Molecule Characterization. JOURNAL OF PHYSICS D: APPLIED PHYSICS 2018; 51:193001. [PMID: 34158676 PMCID: PMC8216246 DOI: 10.1088/1361-6463/aab8be] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Single-molecule characterization has become a crucial research tool in the chemical and life sciences, but limitations, such as limited concentration range, inability to control molecular distributions in space, and intrinsic phenomena, such as photobleaching, present significant challenges. Recent developments in non-classical optics and nanophotonics offer promising routes to mitigating these restrictions, such that even low affinity (K D ~ mM) biomolecular interactions can be studied. Here we introduce and review specific nanophotonic devices used to support single molecule studies. Optical nanostructures, such as zero-mode waveguides (ZMWs), are usually fabricated in thin gold or aluminum films and serve to confine the observation volume of optical microspectroscopy to attoliter to zeptoliter volumes. These simple nanostructures allow individual molecules to be isolated for optical and electrochemical analysis, even when the molecules of interest are present at high concentration (μM - mM) in bulk solution. Arrays of ZMWs may be combined with optical probes such as single molecule fluorescence, single molecule fluorescence resonance energy transfer (smFRET), and fluorescence correlation spectroscopy (FCS) for distributed analysis of large numbers of single-molecule reactions or binding events in parallel. Furthermore, ZMWs may be used as multifunctional devices, for example by combining optical and electrochemical functions in a single discrete architecture to achieve electrochemical ZMWs (E-ZMW). In this review, we will describe the optical properties, fabrication, and applications of ZMWs for single-molecule studies, as well as the integration of ZMWs into systems for chemical and biochemical analysis.
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Affiliation(s)
- Garrison M. Crouch
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556
| | - Donghoon Han
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556
| | - Paul W. Bohn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556
- Departmemt of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556
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Kim K, Lee W, Chung K, Lee H, Son T, Oh Y, Xiao YF, Ha Kim D, Kim D. Molecular overlap with optical near-fields based on plasmonic nanolithography for ultrasensitive label-free detection by light-matter colocalization. Biosens Bioelectron 2017; 96:89-98. [PMID: 28463741 DOI: 10.1016/j.bios.2017.04.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 04/19/2017] [Accepted: 04/27/2017] [Indexed: 01/19/2023]
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