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.

scholarly journals Single-Photon Detectors Based on Ultranarrow Superconducting Nanowires

Nano Letters ◽  
2011 ◽  
Vol 11 (5) ◽  
pp. 2048-2053 ◽  
Author(s):  
Francesco Marsili ◽  
Faraz Najafi ◽  
Eric Dauler ◽  
Francesco Bellei ◽  
Xiaolong Hu ◽  
...  
Keyword(s):  
Single Photon ◽  
Photon Detectors ◽  
Superconducting Nanowires ◽  
Single Photon Detectors

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 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.

scholarly journals Focused Ion Beam Processing of Superconducting Junctions and SQUID Based Devices

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
David C. Cox ◽  
John C. Gallop ◽  
Ling Hao
Keyword(s):  
Quantum Interference ◽  
Focused Ion Beam ◽  
Large Range ◽  
Ion Beam ◽  
Lead Times ◽  
Length Scale ◽  
Superconducting Quantum Interference Devices ◽  
Research Areas ◽  
New Research ◽  
Very High

AbstractFocused ion beam (FIB) has found a steady and growing use as a tool for fabrication, particularly in the length-scale of micrometres down to nanometres. Traditionally more commonly used for materials characterisation, FIB is continually finding new research areas in a growing number of laboratories. For example, over the last ten years the number of FIB instruments in the U.K. alone has gone from single figures, largely supplied by a single manufacturer, to many tens of instruments supplied by several competing manufacturers. Although the smaller of the two research areas, FIB fabrication has found itself to be incredibly powerful in the modification and fabrication of devices for all kinds of experimentation. Here we report our use of FIB in the production of Superconducting QUantum Interference Devices (SQUIDs) and other closely related devices for metrological applications. This is an area ideally suited to FIB fabrication as the required precision is very high, the number of required devices is relatively low, but the flexibility of using FIB means that a large range of smallbatch, and often unique, devices can be constructed quickly and with very short lead times.

Single photon detectors based on superconducting nanowires over large active areas

2009 ◽  
Vol 97 (1) ◽  
pp. 187-191 ◽  
Author(s):  
L. Zhang ◽  
Q. Zhao ◽  
Y. Zhong ◽  
J. Chen ◽  
C. Cao ◽  
...  
Keyword(s):  
Single Photon ◽  
Photon Detectors ◽  
Superconducting Nanowires ◽  
Single Photon Detectors

Focused-ion-beam overlay-patterning of three-dimensional diamond structures for advanced single-photon properties

2014 ◽  
Vol 116 (4) ◽  
pp. 044308 ◽  
Author(s):  
Qianqing Jiang ◽  
Dongqi Liu ◽  
Gangqin Liu ◽  
Yanchun Chang ◽  
Wuxia Li ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Single Photon ◽  
Ion Beam ◽  
Three Dimensional

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.

scholarly journals The role of chalcogen vacancies for atomic defect emission in MoS2

2020 ◽  
Author(s):  
Elmar Mitterreiter ◽  
Bruno Schuler ◽  
Katja Barthelmi ◽  
Katherine Cochrane ◽  
Jonas Kiemle ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Single Photon ◽  
Ion Beam ◽  
Photon Emission ◽  
Defect Engineering ◽  
Single Photon Emission ◽  
2D Semiconductors ◽  
Ab Initio Theory ◽  
Resolution Imaging

Abstract For two-dimensional (2D) layered semiconductors, control over atomic defects and understanding of their electronic and optical functionality represent major challenges towards developing a mature semiconductor technology using such materials. Here, we correlate generation, optical spectroscopy, atomic resolution imaging, and ab-initio theory of chalcogen vacancies in monolayer MoS2. Chalcogen vacancies are selectively generated by in-vacuo annealing, but also focused ion beam exposure. The defect generation rate, atomic imaging and the optical signatures support this claim. We discriminate the narrow linewidth photoluminescence signatures of vacancies, resulting predominantly from localized defect orbitals, from broad luminescence features in the same spectral range, resulting from adsorbates. Vacancies can be patterned with a precision below 10 nm by ion beams, show single photon emission, and open the possibility for advanced defect engineering of 2D semiconductors at the ultimate scale.

CRITICAL CURRENT DEPENDENCE OF STACKED JOSEPHSON JUNCTIONS DC SQUID IN Bi2Sr2CaCu2O8+Δ

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3270-3273 ◽  
Author(s):  
SANG-JAE KIM
Keyword(s):  
Magnetic Fields ◽  
Critical Current ◽  
Josephson Junctions ◽  
Quantum Interference ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Periodic Modulation ◽  
Superconducting Quantum Interference Device ◽  
Current Dependence ◽  
Loop Area

We investigate critical current (Ic) modulation of stacked Josephson junctions (SJJs) dc superconducting quantum interference device ( dc SQUID) on a Bi 2 Sr 2 CaCu 2 O 8+δ ( Bi -2212) whisker. A coupled SJJs with a completely perforated hole of 0.1 μ m × 0.2 μ m were fabricated by using a 3-D focused-ion-beam (FIB) etching method. Those dc SQUIDs exhibited uniform multi-branch structures and clearly oscillated critical current under external magnetic fields (He). With applying He, the clear periodic modulation patterns of Ic are obtained and well fitted to the calculated value from the loop area of 0.02 μm2.

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