Nanofocusing: reaching out

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vladimir A. Zenin ◽  
Sergey I. Bozhevolnyi
Keyword(s):  
Physical Phenomenon ◽  
Field Enhancement ◽  
Historical Background ◽  
Local Field Enhancement ◽  
Practical Applications ◽  
Electron Generation ◽  
Dielectric Media ◽  
Tapered Waveguide ◽  
Optical Modes ◽  
Fundamental Physical

Abstract Nanofocusing, the term coined by Mark Stockman, has been observed in many different tapered waveguide configurations, demonstrating the possibility for optical modes to be efficiently delivered to and concentrated into nanoscale regions far beyond the diffraction limit in dielectric media. Strong and broadband local field enhancement and slowdown effects associated with the nanofocusing have been exploited for enhancing linear and nonlinear optical phenomena and reaching out to a broad spectrum of diverse applications, from electron generation to water vaporization. Starting with the historical background, we carefully elaborate on the basic concepts and mechanisms involved. We then provide examples of the latest developments in this exciting quest for bringing the fundamental physical phenomenon of nanofocusing into the realm of practical applications in modern nanotechnology.

scholarly journals Luminescent tracks of high-energy photoemitted electrons accelerated by plasmonic fields

Nanophotonics ◽  
2015 ◽  
Vol 4 (4) ◽  
pp. 511-519
Author(s):  
Marcel Di Vece ◽  
Giorgos Giannakoudakis ◽  
Astrid Bjørkøy ◽  
Wingjohn Tang
Keyword(s):  
Confocal Microscopy ◽  
State Of The Art ◽  
Field Enhancement ◽  
Optical Excitation ◽  
High Energy ◽  
Intense Laser ◽  
Electron Interaction ◽  
Intense Laser Pulse ◽  
Local Field Enhancement ◽  
Metal Nanostructure

AbstractThe emission of an electron from a metal nanostructure under illumination and its subsequent acceleration in a plasmonic field forms a platform to extend these phenomena to deposited nanoparticles, which can be studied by state-of-the-art confocal microscopy combined with femtosecond optical excitation. The emitted and accelerated electrons leave defect tracks in the immersion oil, which can be revealed by thermoluminescence. These photographic tracks are read out with the confocal microscope and have a maximum length of about 80 μm, which corresponds to a kinetic energy of about 100 keV. This energy is consistent with the energy provided by the intense laser pulse combined with plasmonic local field enhancement. The results are discussed within the context of the rescattering model by which electrons acquire more energy. The visualization of electron tracks originating from plasmonic field enhancement around a gold nanoparticle opens a new way to study with confocal microscopy both the plasmonic properties of metal nano objects as well as high energy electron interaction with matter.

Hollow Au nanorattles for boosting the performance of organic photovoltaics

2019 ◽  
Vol 7 (47) ◽  
pp. 26797-26803 ◽  
Author(s):  
Zhi Yong Bao ◽  
Shenghua Liu ◽  
Yidong Hou ◽  
Aixue Shang ◽  
Feng Yan ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Local Field ◽  
Organic Photovoltaics ◽  
Plasmon Resonance ◽  
Resonance Energy Transfer ◽  
Field Enhancement ◽  
Resonance Energy ◽  
Local Field Enhancement ◽  
Plasmon Resonance Energy Transfer

The interplay between local field enhancement and plasmon resonance energy transfer boosts the performance of hollow Au nanorattle-incorporated organic photovoltaics.

scholarly journals Guided Optical Modes in Metal-Cladded Tunable Hyperbolic Metamaterial Slab Waveguides

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 176 ◽  
Author(s):  
Marcin Kieliszczyk ◽  
Bartosz Janaszek ◽  
Anna Tyszka-Zawadzka ◽  
Paweł Szczepański
Keyword(s):  
Power Flow ◽  
Guided Waves ◽  
Flow Direction ◽  
Nonlinear Effects ◽  
Optical Signal ◽  
Infrared Range ◽  
Graphene Sheets ◽  
Hyperbolic Metamaterial ◽  
Practical Applications ◽  
Optical Modes

We have theoretically investigated metal-cladded waveguides of tunable hyperbolic metamaterial (THMM) cores, employing graphene sheets as a tunable layer, in terms of guided waves propagation over near- to mid-infrared range, following the effective medium approximation. We have proven that these subwavelength guiding structures offer a number of effects usually not found in other types of waveguides, including controllable propagation gap and number of modes, inversion of power flow direction with respect to phase velocity, TM mode propagation, and absence of the fundamental mode, which occur as a result of controlled change of the guiding layer dispersion regime. This is the first time that the above-mentioned effects are obtained with a single, voltage-controlled waveguiding structure comprising graphene sheets and a dielectric, although the presented methodology allows us to incorporate other tunable materials beyond graphene equally well. We believe that such or similar structures, feasible by means of current planar deposition techniques, will ultimately find their practical applications in optical signal processing, controlled phase matching, controlled coupling, signal modulation, or the enhancement of nonlinear effects.

Local Field Enhancement of Mid-Infrared Light in an Integrated Photonic-Plasmonic Structure

2015 ◽  
Vol 33 (2) ◽  
pp. 368-371 ◽  
Author(s):  
Andrea Blanco-Redondo ◽  
Paulo Sarriugarte ◽  
Angel Garcia-Adeva ◽  
Joseba Zubia ◽  
Rainer Hillenbrand
Keyword(s):  
Local Field ◽  
Field Enhancement ◽  
Infrared Light ◽  
Local Field Enhancement ◽  
Mid Infrared ◽  
Plasmonic Structure
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