51 research outputs found
Reliable Nanofabrication of Single-Crystal Diamond Photonic Nanostructures for Nanoscale Sensing
In this manuscript, we outline a reliable procedure to manufacture photonic nanostructures
from single-crystal diamond (SCD). Photonic nanostructures, in our case SCD nanopillars on thin
(<1 ”m) platforms, are highly relevant for nanoscale sensing. The presented top-down procedure
includes electron beam lithography (EBL) as well as reactive ion etching (RIE). Our method introduces
a novel type of inter-layer, namely silicon, that significantly enhances the adhesion of hydrogen
silsesquioxane (HSQ) electron beam resist to SCD and avoids sample charging during EBL. In contrast
to previously used adhesion layers, our silicon layer can be removed using a highly-selective RIE step,
which is not damaging HSQ mask structures. We thus refine published nanofabrication processes to
ease a higher process reliability especially in the light of the advancing commercialization of SCD
sensor devices
Reliable Nanofabrication of Single-Crystal Diamond Photonic Nanostructures for Nanoscale Sensing
In this manuscript, we outline a reliable procedure to manufacture photonic
nanostructures from single-crystal diamond (SCD). Photonic nanostructures, in
our case SCD nanopillars on thin (< 1m) platforms, are highly relevant for
nanoscale sensing. The presented top-down procedure includes electron beam
lithography (EBL) as well as reactive ion etching (RIE). Our method introduces
a novel type of inter-layer, namely silicon, that significantly enhances the
adhesion of hydrogen silsesquioxane (HSQ) electron beam resist to SCD and
avoids sample charging during EBL. In contrast to previously used adhesion
layers, our silicon layer can be removed using a highly-selective RIE step
which is not damaging HSQ mask structures. We thus refine published
nanofabrication processes to ease a higher process reliability especially in
the light of the advancing commercialization of SCD sensor devices.Comment: v2: accepted for publication in Micromachines 2019, 10(11), 718;
https://doi.org/10.3390/mi1011071
Enhancement of bulk second-harmonic generation from silicon nitride films by material composition
We present a comprehensive tensorial characterization of second-harmonic
generation from silicon nitride films with varying composition. The samples
were fabricated using plasma-enhanced chemical vapor deposition, and the
material composition was varied by the reactive gas mixture in the process. We
found a six-fold enhancement between the lowest and highest second-order
susceptibility, with the highest value of approximately 5 pm/V from the most
silicon-rich sample. Moreover, the optical losses were found to be sufficiently
small (below 6 dB/cm) for applications. The tensorial results show that all
samples retain in-plane isotropy independent of silicon content, highlighting
the controllability of the fabrication process.Comment: 4 pages, 3 figures, 2 tables; Re-submitted to Optics Letter
Nanoscale sensing based on nitrogen vacancy centers in single crystal diamond and nanodiamonds : achievements and challenges
Powered by the mutual developments in instrumentation, materials and theoretical descriptions,
sensing and imaging capabilities of quantum emitters in solids have significantly increased in the past
two decades. Quantum emitters in solids, whose properties resemble those of atoms and ions, provide
alternative ways to probing natural and artificial nanoscopic systems with minimum disturbance and
ultimate spatial resolution. Among those emerging quantum emitters, the nitrogen vacancy (NV)
color center in diamond is an outstanding example due to its intrinsic properties at room temperature
(highly-luminescent, photo-stable, biocompatible, highly-coherent spin states). This review article
summarizes recent advances and achievements in using NV centers within nano- and single crystal
diamonds in sensing and imaging. We also highlight prevalent challenges and material aspects for
different types of diamond and outline the main parameters to consider when using color centers as
sensors. As a novel sensing resource, we highlight the properties of NV centers as light emitting
electrical dipoles and their coupling to other nanoscale dipoles e.g. graphene
Surface-induced charge state conversion of nitrogen-vacancy defects in nanodiamonds
We present a study of the charge state conversion of single nitrogen-vacancy
(NV) defects hosted in nanodiamonds (NDs). We first show that the proportion of
negatively-charged NV defects, with respect to its neutral counterpart
NV, decreases with the size of the ND. We then propose a simple model
based on a layer of electron traps located at the ND surface which is in good
agreement with the recorded statistics. By using thermal oxidation to remove
the shell of amorphous carbon around the NDs, we demonstrate a significant
increase of the proportion of NV defects in 10-nm NDs. These results are
invaluable for further understanding, control and use of the unique properties
of negatively-charged NV defects in diamondComment: 6 pages, 4 figure
Cascaded four-wave mixing in tapered plasmonic nanoantenna
We study theoretically the cascaded four-wave mixing (FWM) in broadband
tapered plasmonic nanoantennas and demonstrate a 300-fold increase in nonlinear
frequency conversion detected in the main lobe of the nanoantenna far-field
pattern. This is achieved by tuning the elements of the nanoantenna to resonate
frequencies involved into the FWM interaction. Our findings have a potentially
broad application in ultrafast nonlinear spectroscopy, sensing, on-chip optical
frequency conversion, nonlinear optical metamaterials and photon sources
Correction : Radtke et al. Plasma Treatments and Light Extraction from Fluorinated CVD-Grown (400) Single Crystal Diamond Nanopillars. C 2020, 6, 37
The authors would like to update the XPS spectrum in Figure 3c [...
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