In all cases the Ref. Highly efficient photodetection can be achieved by using the metallic antenna to simultaneously improve both light absorption, as resonant elements, and photocarrier collection, as electrodes.
Tunable emission from 2-dimensional semiconductor with platelet optical antennas; Tunable emission from 2-D semiconductor with platelet optical antennas Author: In this thesis we will show a comprehensive study of the physical phenomena that limit the resolution for EBL at keV.
In support of this work, we investigated the impact of plasmonic resonances in metallic nanostructures.
The effect of atomic structure on electronic properties is also investigated, via correlation of atomic structure characterized by high resolution transmission electron microscopy, electronic structure probed by electron energy loss spectroscopy, and measured electronic properties.
An approximate expression resting on modal results is proposed for the resonant length of nanomonopoles, and a simple equivalent circuit, also resting on modal results, but involving transmission lines and a capacitor modelling the gap is proposed to determine the resonant wavelength of nanodipoles.
However, the challenge is its insufficient light absorption that largely limits the responsivity. Current commercial products used to detect THz radiation, like Golay cells and pyroelectric detectors, have only slow detection rates and poor sensitivities.
In this thesis, two types of room-temperature high-responsivity graphene-based THz detectors are presented, relying on the unique properties of graphene and the function of plasmonic antenna arrays which boost the interaction between THz waves and graphene.
The first design is based on an array of planar antennas arranged in series and shorted by graphene squares. This talk will be itemized into two main categories - materials and nanostructures. The observed orientation dependence of reverse tunneling is attributed to interface defects induced by different atomic structures.
Thesis Supervisor - Prof.
The tunability of photoluminescence by nearby antenna is analyzed in details. Highly efficient photodetection can be achieved by using the metallic antenna to simultaneously improve both light absorption, as resonant elements, and photocarrier collection, as electrodes.
Barry has written a number of highly cited works including five papers with more than citations each. Massachusetts Institute of Technology Date Issued: Therefore, motivated by its tremendous potential in the biochemistry and photochemical applications, this presentation focuses on the advancement of UV Plasmonics in terms of metallic nanostructure design, fabrication and material characterization.
Massachusetts Institute of Technology Other Contributors: Here, we explore the possibility of tuning the spontaneous emission of monolayer MoS 2 by coupling it with plasmonic platelet antennas, which can both convert freely propagating light into nanoscale and transmit radiation power into free space efficiently.
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Plasmon resonance frequency and intensity are demonstrated to be systematically tunable by varying device geometry. This ultrathin structure can facilitate the development of on-chip emitters and valley-based devices. The second detector is based on an array of interdigitated bow-tie antennas connected in parallel and shunted by graphene squares.
Publicly Accessible Penn Dissertations.Blog | Nanoclast; Novel Silicon Laser Sounds Like a Good Idea for Photonic Integrated Circuits. A laser that combines light and sound and. The Raman scattering results showed the highest enhancement factor (EF = 2) for antennas with an "inverted configuration," which involved having the triangles of the antenna facing back-to-back rather than the more conventional tip-to-tip bowtie arrangement.
plasmonic nanoantenna from what is obtained for that when is located in free space. Integrating a silver layer can reduce the antenna interaction with the dielectric sub- 4. Optical characterization of plasmonic nanostructures: near-field imaging of the magnetic field of light. [Denitza Denkova] -- This thesis focuses on a means of obtaining, for the first time, full electromagnetic imaging of photonic nanostructures.
This thesis investigates the fundamental nanoscale near-field light matter interaction between a probe tip and plasmonic antenna nanostructures. The thesis is focused on polarization control of metallic plasmon modes using scattering-type scanning near-field optical microscopy (s-SNOM).
She received her Ph.D. in Materials Science from Caltech with a thesis entitled, “Optics at the Nanoscale: Light Emission in Plasmonic Nanocavities” in She earned her M.S. in Materials Science at Caltech in and her B.S. in Materials Science and Engineering at .Download