scholarly journals Probing plasmonic hot spots on single gold nanowires using combined near-field techniques

2015 ◽  
Author(s):  
Patrick Hsia ◽  
Ludovic Douillard ◽  
Fabrice Charra ◽  
Sylvie Marguet ◽  
Sergei Kostcheev ◽  
...  
Keyword(s):  
Hot Spots ◽  
Near Field ◽  
Gold Nanowires ◽  
Field Techniques

scholarly journals Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography

2018 ◽  
Vol 9 ◽  
pp. 1536-1543 ◽  
Author(s):  
Gitanjali Kolhatkar ◽  
Alexandre Merlen ◽  
Jiawei Zhang ◽  
Chahinez Dab ◽  
Gregory Q Wallace ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Hot Spots ◽  
Near Field ◽  
Nanosphere Lithography ◽  
Plasmonic Nanostructures ◽  
Far Field ◽  
Optical Images ◽  
Spatial Frequencies ◽  
Comparison Of The Results ◽  
Non Destructive

We introduce a simple, fast, efficient and non-destructive method to study the optical near-field properties of plasmonic nanotriangles prepared by nanosphere lithography. Using a rectangular Fourier filter on the blurred signal together with filtering of the lower spatial frequencies to remove the far-field contribution, the pure near-field contributions of the optical images were extracted. We performed measurements using two excitation wavelengths (532.1 nm and 632.8 nm) and two different polarizations. After the processing of the optical images, the distribution of hot spots can be correlated with the topography of the structures, as indicated by the presence of brighter spots at the apexes of the nanostructures. This technique is validated by comparison of the results to numerical simulations, where agreement is obtained, thereby confirming the near-field nature of the images. Our approach does not require any advanced equipment and we suggest that it could be applied to any type of sample, while keeping the measurement times reasonably short.

scholarly journals Controlling the near-field excitation of nano-antennas with phase-change materials

2013 ◽  
Vol 4 ◽  
pp. 632-637 ◽  
Author(s):  
Tsung Sheng Kao ◽  
Yi Guo Chen ◽  
Ming Hui Hong
Keyword(s):  
Thin Layer ◽  
Phase Change ◽  
Hot Spots ◽  
Phase Change Materials ◽  
Near Field ◽  
Plasmon Coupling ◽  
New Approach ◽  
Field Excitation ◽  
Bio Assay ◽  
Nano Antennas

By utilizing the strongly induced plasmon coupling between discrete nano-antennas and quantitatively controlling the crystalline proportions of an underlying Ge2Sb2Te5 (GST) phase-change thin layer, we show that nanoscale light localizations in the immediate proximity of plasmonic nano-antennas can be spatially positioned. Isolated energy hot-spots at a subwavelength scale can be created and adjusted across the landscape of the plasmonic system at a step resolution of λ/20. These findings introduce a new approach for nano-circuitry, bio-assay addressing and imaging applications.

scholarly journals Manipulation of local optical properties and structures in molybdenum-disulfide monolayers using electric field-assisted near-field techniques

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Junji Nozaki ◽  
Musashi Fukumura ◽  
Takaaki Aoki ◽  
Yutaka Maniwa ◽  
Yohei Yomogida ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electric Field ◽  
Molybdenum Disulfide ◽  
Near Field ◽  
Field Techniques

scholarly journals Far-field midinfrared superresolution imaging and spectroscopy of single high aspect ratio gold nanowires

2020 ◽  
Vol 117 (5) ◽  
pp. 2288-2293 ◽  
Author(s):  
Kyle Aleshire ◽  
Ilia M. Pavlovetc ◽  
Robyn Collette ◽  
Xiang-Tian Kong ◽  
Philip D. Rack ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Optical Measurement ◽  
Near Field ◽  
Metal Nanostructures ◽  
Gold Nanowires ◽  
Far Field ◽  
Ambient Conditions ◽  
Fabry Perot ◽  
Imaging And Spectroscopy

Limited approaches exist for imaging and recording spectra of individual nanostructures in the midinfrared region. Here we use infrared photothermal heterodyne imaging (IR-PHI) to interrogate single, high aspect ratio Au nanowires (NWs). Spectra recorded between 2,800 and 4,000 cm−1 for 2.5–3.9-μm-long NWs reveal a series of resonances due to the Fabry–Pérot modes of the NWs. Crucially, IR-PHI images show structure that reflects the spatial distribution of the NW absorption, and allow the resonances to be assigned to the m = 3 and m = 4 Fabry–Pérot modes. This far-field optical measurement has been used to image the mode structure of plasmon resonances in metal nanostructures, and is made possible by the superresolution capabilities of IR-PHI. The linewidths in the NW spectra range from 35 to 75 meV and, in several cases, are significantly below the limiting values predicted by the bulk Au Drude damping parameter. These linewidths imply long dephasing times, and are attributed to reduction in both radiation damping and resistive heating effects in the NWs. Compared to previous imaging studies of NW Fabry–Pérot modes using electron microscopy or near-field optical scanning techniques, IR-PHI experiments are performed under ambient conditions, enabling detailed studies of how the environment affects mid-IR plasmons.

Study of Hot Spots Probing Based on Meta-Pillars Array

2019 ◽  
Vol 16 (9) ◽  
pp. 3692-3697
Author(s):  
Yisha You ◽  
Fujuan Huang ◽  
Yongqi Fu ◽  
Shaoli Zhu
Keyword(s):  
Hot Spots ◽  
Near Field ◽  
Optical Microscope ◽  
Microscopic Imaging ◽  
Secondary Sources ◽  
Imaging Application ◽  
Calculation Results ◽  
Wavelength Resolution ◽  
Near Field Scanning ◽  
Sub Wavelength

Inspired by imaging principle of near-field scanning optical microscope (NSOM), meta-pillars array is designed and analyzed on the basis of microscopic imaging application with high resolution. Finely focused spots acting as tiny secondary sources for illumination at near-field can be derived under supporting of the meta-pillars for the purpose of increasing imaging resolution. Numerical calculation is carried out on the basis of finite difference and time domain (FDTD) algorithm. Our calculation results demonstrate that the meta-pillars are capable of supporting the microscopic imaging at sub-wavelength resolution.

Surface plasmon “hot spots” detected by near-field polarization spectroscopy

2010 ◽  
Author(s):  
F. Tantussi ◽  
V. Clericò ◽  
C. Martella ◽  
V. Priya ◽  
F. Fuso ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Hot Spots ◽  
Near Field ◽  
Polarization Spectroscopy ◽  
Field Polarization
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