Due to its distinct optical characteristics, such as electrical adjustability and robust spatial confinement, graphene surface plasmons (GSPs) possess significant potential for controlling light within a compressed two-dimensional (2D) domain at extremely small sub-wavelength scales. While the interaction of light with materials in three-dimensional (3D) space is well-established, our comprehension of 2D plasmons is still nascent, primarily explored in limited scenarios, such as the interaction of GSPs with structured graphene like nano-gaps. This investigation expands our insights by exploring how GSPs interact with metallic nano-plates, specifically focusing on GSP reflection phase shift. By developing a rigorous model, we show that highly confined GSPs, with significantly larger momentum than free space photons, undergo nearly complete internal reflection associated with an anomalous phase shift of 0.885π in the reflection. Our findings contribute a comprehensive understanding of manipulating GSPs using a straightforward nanostructure. This knowledge is essential for advancing nanostructure-integrated low-dimensional devices and 2D nanophotonics.
We discuss propagation behaviors of surface plasmons (SPs) in 2-dimensional (2D) and 1-dimensional (1D) materials, such as graphene and carbon nanotubes. Firstly, we introduce recent theoretical and experimental studies on the reflections of SPs at the edge of 2D material, and discuss corresponding anomalous phase shifts. Also, we extend our theoretical model to describe the tunneling of SPs through an abrupt nano-gap in 2D surface. Specifically, we examine gap-size dependent tunneling efficiency and the nature of phase shift. Finally, we apply our model to explain SP interaction with the end of 1D material, and discuss how the SP reflection in the 1D system can be described.
In this paper, we theoretically study optical responses of tightly-coupled terahertz metamaterial. Unlike loosely-coupled
one, tightly-coupled metamaterials exhibit resonant optical responses that are highly dependent on the interaction
between each unit resonators. In order to predict optical response and spectral behavior of effective parameters of the
metamaterials, a model based on coupled-mode theory is applied. Resonant optical response is shown to be highly
dependent on the gap-size between the resonators which relates to the inter-unit coupling, and we show that this
dependency implies the possibility of miniaturized metamaterials .
A dramatic spectral line narrowing of the edge-emission, at room temperature, from tris(quinolinolate) Al (Alq3),
N,N'-diphenyl-N,N'-bis(1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPD), 4,4'-bis(2,2'-diphenyl- vinyl)-1,1'-
biphenyl (DPVBi), and some guest-host small molecular OLEDs, fabricated on ITO-coated glass, is described. In all
but the DPVBi OLEDs, the narrowed emission band emerges above a threshold thickness of the emitting layer, and
narrows down to a full width at half maximum of only 5 - 10 nm. The results demonstrate that this narrowed emission
is due to irregular waveguide modes that leak from the ITO to the glass substrate at a grazing angle. While
measurements of variable stripe length (l) devices exhibit an apparent weak optical gain, there is no observable
threshold current or bias associated with this spectral narrowing. It is suspected that the apparent weak optical gain is
due to misalignment of the axis of the waveguided mode and the axis of the collection lens of the probe, but it is not
clear if such a misalignment can account for the for the observed evolution of the edge emission spectra with l.
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