scholarly journals Intrinsic luminescence blinking from plasmonic nanojunctions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wen Chen ◽  
Philippe Roelli ◽  
Aqeel Ahmed ◽  
Sachin Verlekar ◽  
Huatian Hu ◽  
...  
Keyword(s):  
Electromagnetic Fields ◽  
Noble Metal ◽  
Light Emission ◽  
Raman Signal ◽  
Metal Structures ◽  
Intrinsic Luminescence ◽  
Scattering Spectrum ◽  
Domain Boundaries ◽  
Plasmon Resonances ◽  
Molecule Interactions

AbstractPlasmonic nanojunctions, consisting of adjacent metal structures with nanometre gaps, can support localised plasmon resonances that boost light matter interactions and concentrate electromagnetic fields at the nanoscale. In this regime, the optical response of the system is governed by poorly understood dynamical phenomena at the frontier between the bulk, molecular and atomic scales. Here, we report ubiquitous spectral fluctuations in the intrinsic light emission from photo-excited gold nanojunctions, which we attribute to the light-induced formation of domain boundaries and quantum-confined emitters inside the noble metal. Our data suggest that photoexcited carriers and gold adatom - molecule interactions play key roles in triggering luminescence blinking. Surprisingly, this internal restructuring of the metal has no measurable impact on the Raman signal and scattering spectrum of the plasmonic cavity. Our findings demonstrate that metal luminescence offers a valuable proxy to investigate atomic fluctuations in plasmonic cavities, complementary to other optical and electrical techniques.

scholarly journals Linewidth narrowing of aluminum breathing plasmon resonances in Bragg gratings decorated nanodisks

2021 ◽  
Author(s):  
Xiaomin Zhao ◽  
Chenglin Du ◽  
Rong Leng ◽  
Li Li ◽  
Weiwei Luo ◽  
...  
Keyword(s):  
Light Emission ◽  
Emission Control ◽  
Bragg Gratings ◽  
High Quality ◽  
Plasmon Resonances ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Radiative Losses

Plasmon resonances with high-quality are of great importance in light emission control and light-matter interaction. Nevertheless, the inherent Ohmic and radiative losses usually hinder the plasmon performance of the metallic...

Finite-Size Effects and Surface-Enhanced Raman Scattering in Noble-Metal Nanoparticles

2004 ◽  
Vol 818 ◽  
Author(s):  
Vitaliy N. Pustovit ◽  
Tigran V. Shahbazyan
Keyword(s):  
Raman Scattering ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Finite Size ◽  
Surface Enhanced Raman Scattering ◽  
Noble Metal Nanoparticles ◽  
Raman Signal ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

AbstractWe study the role of a strong electron confinement on the surface-enhanced Raman scattering from molecules adsorbed on small noble-metal nanoparticles. We describe a novel enhancement mechanism which originates from the different effect that confining potential has on s-band and d-band electrons. We demonstrate that the interplay between finite-size and screening efects in the nanoparticle surface layer leads to an enhancement of the surface plasmon local field acting on a molecule located in a close proximity to the metal surface. Our calculations show that the additional enhancement of the Raman signal is especially strong for small nanometer-sized nanoparticles.

scholarly journals Shape-Controlled Synthesis and Surface Plasmonic Properties of Metallic Nanostructures

MRS Bulletin ◽  
2005 ◽  
Vol 30 (5) ◽  
pp. 338-348 ◽  
Author(s):  
Younan Xia ◽  
Naomi J. Halas
Keyword(s):  
Electromagnetic Fields ◽  
Light Transmission ◽  
Analytical Techniques ◽  
Silver Nanostructures ◽  
Colorimetric Sensing ◽  
Free Electrons ◽  
Surface Plasmon Resonances ◽  
Metal Structures ◽  
Silver Nanostructure ◽  
Dielectric Interfaces

AbstractThe interaction of light with free electrons in a gold or silver nanostructure can give rise to collective excitations commonly known as surface plasmons. Plasmons provide a powerful means of confining light to metal/dielectric interfaces, which in turn can generate intense local electromagnetic fields and significantly amplify the signal derived from analytical techniques that rely on light, such as Raman scattering. With plasmons, photonic signals can be manipulated on the nanoscale, enabling integration with electronics (which is now moving into the nano regime). However, to benefit from their interesting plasmonic properties, metal structures of controlled shape (and size) must be fabricated on the nanoscale. This issue of MRS Bulletin examines how gold and silver nanostructures can be prepared with controllable shapes to tailor their surface plasmon resonances and highlights some of the unique applications that result, including enhancement of electromagnetic fields, optical imaging, light transmission, colorimetric sensing, and nanoscale waveguiding.

Light emission from metal‐insulator‐metal structures

1993 ◽  
Vol 73 (1) ◽  
pp. 384-393 ◽  
Author(s):  
P. Canet ◽  
C. Laurent ◽  
J. Akinnifesi ◽  
B. Despax
Keyword(s):  
Light Emission ◽  
Metal Insulator ◽  
Metal Structures ◽  
Metal Insulator Metal

Free Catalyst Synthesis of GaN Nanostructures on Si-Substrate via CVD

2013 ◽  
Vol 756 ◽  
pp. 59-65
Author(s):  
Qathan Nofan Abdullah ◽  
Fong Kwong Yam ◽  
Hassan Zainuriah ◽  
Mohamed Bououdina
Keyword(s):  
Gallium Nitride ◽  
Light Emission ◽  
Uv Light ◽  
Chemical Vapor ◽  
Emission Peak ◽  
Metal Catalyst ◽  
Yellow Light ◽  
Catalyst Synthesis ◽  
Scattering Spectrum ◽  
Diffraction Peaks

In this article gallium nitride (GaN) nanostructures have been grown through chemical vapor deposition (CVD) on Silicon substrate, no metal catalyst was used. A high purity of gallium nitride powder was evaporated at 1150°C for 3 hour and then annealed at temperature 1000°C under flow of ammonia (NH3)gas. XRD shows the diffraction peaks located at 2θ= 32.4, 34.4, 36.8, 48.1, 57.8, 63.5, 68.3, 69.2° corresponding to the (100), (002), (101), (102), (110), (103), (200) and (112) diffraction planes of the product. These results revealed that the diffraction peaks can be attributed to the hexagonal GaN phase with lattice constant of a = 3.189 Å and c = 5.200 Å. Raman scattering spectrum shows four phonons mode correspond to GaN nanostructure are detected at 560, 570, 720 and 740 cm-1corresponding E1(TO), E2(high),A1(LO) and E1(LO) respectively. Photoluminescence (PL) of the GaN nanostructure exhibited two emission peaks, a weak and broad ultraviolet (UV) light emission peak at 390 nm and a strong yellow light (YL) emission peak at 550 nm.

scholarly journals Semi-Intrinsic Luminescence in Marine Organisms

2021 ◽  
Author(s):  
Jeremy Mirza ◽  
Yuichi Oba
Keyword(s):  
Light Emission ◽  
Marine Species ◽  
Marine Organisms ◽  
Filter Feeding ◽  
Intrinsic Luminescence ◽  
Metridia Pacifica

Light emission is widespread in the oceans, with over three quarters of all observed marine species exhibiting bioluminescence. Several organisms such as the copepod Metridia pacifica and the ostracod Vargula hilgendorfii have been proven to synthesise their luciferin and luciferase to facilitate light emission. However, many luminescent species lack the capability to do this and instead it is possible that they acquire some of the components for their luminescence through predation or filter feeding on organisms that produce luciferins or precursors to these molecules. This has resulted in many organisms using certain luciferins, such as coelenterazine, as their substrate without possessing a clear mechanism to synthesise these. This chapter will review several examples of these semi-intrinsic luminescent systems and how the substrates and enzymes can be obtained for these reactions. Moreover, it will look at why particular luciferins, such as coelenterazine, are more widespread and utilised in this manner compared to other substrates.

scholarly journals Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches

RSC Advances ◽  
2016 ◽  
Vol 6 (116) ◽  
pp. 115284-115289 ◽  
Author(s):  
Annette Dowd ◽  
Mathias Geisler ◽  
Shaoli Zhu ◽  
Michelle L. Wood ◽  
Michael B. Cortie
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Surface Enhanced Raman

Large more reproducibly fabricated microstructures can also provide significant Raman signal enhancementviausually neglected multipolar plasmon resonances.

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