READ ME File For 'dielectric holograms dataset'

Dataset DOI: 10.5258/SOTON/D0538


This dataset supports the publication:
B. P. Clarke, K. F. MacDonald, & N. I. Zheludev (2018). 
All-dielectric free-electron-driven holographic light sources. 
in Applied Physics Letters. 


Contents
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This research data description should be read and understood in the context of the corresponding manuscript. The figure numbers correspond to the figure numbers of the manuscript and the data corresponds to the data as shown in the figures.


The figure descriptions as given in the corresponding manuscript are given below.  

The zip archive contains the data for figures 1c, 2, and 3. 
For Figures 1c and 3, the raw CCD data (cartesian coordinate spatial distributions of electron-induced radiation emission) is provided.
[Figure 1a is a schematic diagram only; Figure 1b is a scanning electron microscope image only]


Figure 1. (a) Schematic illustration of a free-electron holographic light source:
The surface-relief pattern is engineered to couple the electromagnetic excitation
resulting from the normally incident free-electron impact at the central
target point to an output beam of a chosen wavelength and wavefront profile,
in particular, polar theta and azimuthal phi directions. (b) Scanning electron
microscopy image of a gold holographic source (after Ref. 26) designed to
produce an output beam at a wavelength of 800 nm at theta=30degrees. (c) Angular
distribution of 800+/-20nm light emission induced by the 30 keV electron-
beam impact at the target point of the holographic source shown in panel (b).


Figure 2. (a) Electron-induced light emission intensity spectra, in counts per
nA of 30 kV electron beam current, for unstructured polycrystalline GST,
silicon, silica, and sapphire (as labelled). (b) VIS-NIR spectral dispersion of
the real n and imaginary k parts of the refractive index for the same four
materials, as used in computational design of holographic sources (data for
GST are ellipsometrically measured for the experimental thin film and taken
for other materials from Refs. 34–36). Vertical lines running across panels
(a) and (b) denote the wavelengths selected for holographic emitter design.


Figure 3. Top row: Scanning electron microscope images of holographic emitters
for each of the four target materials, polycrystalline GST, silicon, silica,
and sapphire (columns as labelled; variations in imaging contrast/resolution
among these reflect variations in electrical conductivity). Subsequent rows:
Angular distribution of electron-beam-induced light emission at 550, 800, and
1000 +/- 20nm (rows as labelled) from holographic surface-relief structures
designed for said wavelengths on each target material, with corresponding figures
of merit for the proportion of light emitted in the intended theta = 30 degrees direction.
(The azimuthal emission angle phi is determined simply by the in-plane
orientation of the samples’ mirror symmetry axes and was set to approx. 300 degreesin all
cases. The bright feature at the bottom edge of each emission map is an artefact
of mirror geometry/alignment and may be disregarded.).



Geographic location of data collection: University of Southampton, U.K.

Related projects:
The Physics & Technology of Photonic Metadevices & Metasystems
Hayden, B., Richardson, D., Zheludev, N., Plum, E. & Muskens, O.
EPSRC
EP/M009122/1



Dataset available under a CC BY 4.0 licence


Publisher: University of Southampton, U.K.


Date: December 2018