scholarly journals Bright Single-Photon Emitters with a CdSe Quantum Dot and Multimode Tapered Nanoantenna for the Visible Spectral Range

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 916
Author(s):  
Maxim Rakhlin ◽  
Sergey Sorokin ◽  
Dmitrii Kazanov ◽  
Irina Sedova ◽  
Tatiana Shubina ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spectral Range ◽  
Focused Ion Beam ◽  
Optical Pumping ◽  
Single Photon ◽  
Ion Beam ◽  
Visible Spectral Range ◽  
Single Photons ◽  
Free Space Optical ◽  
Single Photon Emitters

We report on single photon emitters for the green-yellow spectral range, which comprise a CdSe/ZnSe quantum dot placed inside a semiconductor tapered nanocolumn acting as a multimode nanoantenna. Despite the presence of many optical modes inside, such a nanoantenna is able to collect the quantum dot radiation and ensure its effective output. We demonstrate periodic arrays of such emitters, which are fabricated by focused ion beam etching from a II-VI/III-V heterostructure grown using molecular beam epitaxy. With non-resonant optical pumping, the average count rate of emitted single photons exceeds 5 MHz with the second-order correlation function g(2)(0) = 0.25 at 220 K. Such single photon emitters are promising for secure free space optical communication lines.

ORGANIC SEMICONDUCTOR MICRO-PILLAR PROCESSED BY FOCUSED ION BEAM MILLING

2005 ◽  
Vol 03 (supp01) ◽  
pp. 223-228 ◽  
Author(s):  
WEN-CHANG HUNG ◽  
A. ADAWI ◽  
A. TAHRAOUI ◽  
A. G. CULLIS
Keyword(s):  
Quantum Dot ◽  
Single Molecule ◽  
Focused Ion Beam ◽  
Single Photon ◽  
Ion Beam ◽  
Photon Emission ◽  
Micro Machining ◽  
Single Photon Emission ◽  
Fabrication Procedure ◽  
Pillar Structure

In order to control light, different strategies have been applied by placing an optically active medium into a semiconductor resonator and certain applications such as LEDs and laser diodes have been commercialized for many years. The possibility of nanoscale optical applications has created great interesting for quantum nanostructure research. Recently, single photon emission has been an active area of quantum dot research. A quantum dot is place between distributed Bragg reflectors (DBRs) within a micro-pillar structure. In this study, we shall report on an active layer composed of an organic material instead of a semiconductor. The micro-pillar structure is fabricated by a focused ion beam (FIB) micro-machining technique. The ultimate target is to achieve a single molecule within the micro-pillar and therefore to enable single photon emission. Here, we demonstrate some results of the fabrication procedure of a 5 micron organic micro-pillar via the focused ion beam and some measurement results from this study. The JEOL 6500 dual column system equipped with both electron and ion beams enables us to observe the fabrication procedure during the milling process. Furthermore, the strategy of the FIB micro-machining method is reported as well.

scholarly journals Photophysics of GaN single-photon emitters in the visible spectral range

2018 ◽  
Vol 97 (16) ◽  
Author(s):  
Amanuel M. Berhane ◽  
Kwang-Yong Jeong ◽  
Carlo Bradac ◽  
Michael Walsh ◽  
Dirk Englund ◽  
...  
Keyword(s):  
Spectral Range ◽  
Single Photon ◽  
Visible Spectral Range ◽  
Single Photon Emitters

scholarly journals Single-photon emitters based on NIR color centers in diamond coupled with solid immersion lenses

2014 ◽  
Vol 12 (07n08) ◽  
pp. 1560011 ◽  
Author(s):  
D. Gatto Monticone ◽  
J. Forneris ◽  
M. Levi ◽  
A. Battiato ◽  
F. Picollo ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Single Photon ◽  
Collection Efficiency ◽  
Ion Beam ◽  
Nitrogen Vacancy ◽  
Color Centers ◽  
Enabling Technology ◽  
High Quantum Efficiency ◽  
Single Photon Emitters ◽  
Single Crystal Diamond

Single-photon sources represent a key enabling technology in quantum optics, and single color centers in diamond are a promising platform to serve this purpose, due to their high quantum efficiency and photostability at room temperature. The widely studied nitrogen-vacancy (NV) centers are characterized by several limitations, thus other defects have recently been considered, with a specific focus of centers emitting in the near-infra red (NIR). In the present work, we report on the coupling of native NIR-emitting centers in high-quality single-crystal diamond with solid immersion lens (SIL) structures fabricated by focused ion beam (FIB) lithography. The reported improvements in terms of light collection efficiency make the proposed system an ideal platform for the development of single-photon emitters with appealing photophysical and spectral properties.

scholarly journals Antenna Design for Directivity-Enhanced Raman Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Aftab Ahmed ◽  
Yuanjie Pang ◽  
Ghazal Hajisalem ◽  
Reuven Gordon
Keyword(s):  
Focused Ion Beam ◽  
Single Photon ◽  
Ion Beam ◽  
Ground Plane ◽  
Numerical Aperture ◽  
Circular Waveguide ◽  
Dipole Antenna ◽  
Electron Beam Evaporation ◽  
Beam Power ◽  
Raman Signal

Antenna performance can be described by two fundamental parameters: directivity and radiation efficiency. Here, we demonstrate nanoantenna designs in terms of improved directivity. Performance of the antennas is demonstrated in Raman scattering experiments. The radiated beam is directed out of the plane by using a ground plane reflector for easy integration with commercial microscopes. Parasitic elements and parabolic and waveguide nanoantennas with a ground plane are explored. The nanoantennas were fabricated by a series of electron beam evaporation steps and focused ion beam milling. As we have shown previously, the circular waveguide nanoantenna boosts the measured Raman signal by 5.5x with respect to a dipole antenna over a ground plane; here, we present the design process that led to the development of that circular waveguide nanoantenna. This work also shows that the parabolic nanoantenna produces a further fourfold improvement in the measured Raman signal with respect to a circular waveguide nanoantenna. The present designs are nearly optimal in the sense that almost all the beam power is coupled into the numerical aperture of the microscope. These designs can find applications in microscopy, spectroscopy, light-emitting devices, photovoltaics, single-photon sources, and sensing.

Mechanism of the nanoscale localization of Ge quantum dot nucleation on focused ion beam templated Si(001) surfaces

2006 ◽  
Vol 17 (17) ◽  
pp. 4451-4455 ◽  
Author(s):  
A Portavoce ◽  
M Kammler ◽  
R Hull ◽  
M C Reuter ◽  
F M Ross
Keyword(s):  
Quantum Dot ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Ge Quantum Dot

scholarly journals Site-Controlled Telecom Single-Photon Emitters in Atomically-thin MoTe2

2021 ◽  
Author(s):  
Huan Zhao ◽  
Michael Pettes ◽  
Yu Zheng ◽  
Han Htoon
Keyword(s):  
Single Photon ◽  
Transition Metal Dichalcogenides ◽  
Zeeman Splitting ◽  
Single Photons ◽  
Layer By Layer ◽  
Single Photon Emitters ◽  
Anisotropic Exchange Interaction ◽  
Pillar Arrays ◽  
Linearly Polarized ◽  
Metal Dichalcogenides

Abstract Quantum emitters (QEs) in two-dimensional transition metal dichalcogenides (2D TMDCs) have advanced to the forefront of quantum communication and transduction research1 due to their unique potentials in accessing valley pseudo-spin degree of freedom (DOF)2 and facile integration into quantum-photonic, electronic and sensing platforms via the layer-by-layer-assembly approach.3 To date, QEs capable of operating in O-C telecommunication bands have not been demonstrated in TMDCs.4-7 Here we report a deterministic creation of such telecom QEs emitting over the 1080 to 1550 nm wavelength range via coupling of 2D molybdenum ditelluride (MoTe2) to strain inducing nano-pillar arrays.8,9 Our Hanbury Brown and Twiss experiment conducted at 10 K reveals clear photon antibunching with 90% single photon purity. Ultra-long lifetimes, 4-6 orders of magnitude longer than that of the 2D exciton, are also observed. Polarization analysis further reveals that while some QEs display cross-linearly polarized doublets with ~1 meV splitting resulting from the strain induced anisotropic exchange interaction, valley degeneracy is preserved in other QEs. Valley Zeeman splitting as well as restoring of valley symmetry in cross-polarized doublets are observed under 8T magnetic field. In contrast to other telecom QEs,10-12 our QEs which offer the potential to access valley DOF through single photons, could lead to unprecedented advantages in optical fiber-based quantum networks.

Superconducting Nanodevices

2017 ◽  
Author(s):  
J. Gallop ◽  
L. Hao
Keyword(s):  
Quantum Interference ◽  
Focused Ion Beam ◽  
Single Photon ◽  
Ion Beam ◽  
Photon Detectors ◽  
Superconducting Nanowires ◽  
Barrier Materials ◽  
Physical Scale ◽  
Nanoscale Fabrication ◽  
Quantum Technology

This article reviews recent progress in superconducting nanodevices, with particular emphasis on fabrication methods developed for superconducting nanowires and nanoscale Josephson junctions based on different barrier materials. It evaluates the future potential of superconducting nanodevices, including nano-superconducting quantum interference devices (nanoSQUIDs), in light of improvements in nanoscale fabrication and manipulation techniques, along with their likely impacts on future quantum technology and measurement. The article first considers efforts to realize devices at the physical scale of 100 nm and below before discussing different types of Josephson junction such as trilayer junctions. It also describes the use of focused ion beam milling and electron beam lithography techniques for junction fabrication at the nanoscale and the improved energy sensitivity detectable with a nanoSQUID. Finally, it looks at a range of applications for nanoSQUIDs, superconducting single photon detectors, and other superconducting nanodevices.

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