On-chip near field fluorescence excitation and detection with nanophotonic waveguides for enhanced surface sensitivity (Conference Presentation)

2017 ◽  
Author(s):  
Md. Mahmud-Ul-Hasan ◽  
Pieter Neutens ◽  
Liesbet Lagae ◽  
Pol Van Dorpe
Keyword(s):  
Near Field ◽  
Fluorescence Excitation ◽  
Surface Sensitivity ◽  
Nanophotonic Waveguides ◽  
On Chip ◽  
Enhanced Surface

High-Resolution Scanning Electron Microscopy and Microanalysis of Supported Metal Catalysts

1999 ◽  
Vol 589 ◽  
Author(s):  
Jingyue Liu
Keyword(s):  
High Resolution ◽  
Low Voltage ◽  
Supported Catalysts ◽  
Metal Catalysts ◽  
Supported Metal Catalysts ◽  
Surface Sensitivity ◽  
Brightness Field ◽  
Backscattered Electron ◽  
Enhanced Surface ◽  
Supported Metal

AbstractThe use of a high-brightness field emission gun and novel secondary electron detection systems makes it possible to acquire nanometer-resolution surface images of bulk materials, even at low electron beam voltages. The advantages of low-voltage SEM include enhanced surface sensitivity, reduced sample charging on non-conducting materials, and significantly reduced electron range and interaction volume. High-resolution images formed by collecting the backscattered electron signal can give information about the size and spatial distribution of metal nanoparticles in supported catalysts. Low-voltage XEDS can provide compositional information of bulk samples with enhanced surface sensitivity and significantly improved spatial resolution. High-resolution SEM techniques enhance our ability to detect and, subsequently, analyze the composition of nanoparticles in supported metal catalysts. Applications of high-resolution SEM imaging and microanalysis techniques to the study of industrial supported catalysts are discussed.

scholarly journals Demonstration of an integrated nanophotonic chip-scale alkali vapor magnetometer using inverse design

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yoel Sebbag ◽  
Eliran Talker ◽  
Alex Naiman ◽  
Yefim Barash ◽  
Uriel Levy
Keyword(s):  
Spatial Resolution ◽  
Near Field ◽  
Computer Assisted ◽  
Experimental Characterization ◽  
Optical Isolation ◽  
New Concepts ◽  
On Chip ◽  
The Cost ◽  
Micrometer Scale

AbstractRecently, there has been growing interest in the miniaturization and integration of atomic-based quantum technologies. In addition to the obvious advantages brought by such integration in facilitating mass production, reducing the footprint, and reducing the cost, the flexibility offered by on-chip integration enables the development of new concepts and capabilities. In particular, recent advanced techniques based on computer-assisted optimization algorithms enable the development of newly engineered photonic structures with unconventional functionalities. Taking this concept further, we hereby demonstrate the design, fabrication, and experimental characterization of an integrated nanophotonic-atomic chip magnetometer based on alkali vapor with a micrometer-scale spatial resolution and a magnetic sensitivity of 700 pT/√Hz. The presented platform paves the way for future applications using integrated photonic–atomic chips, including high-spatial-resolution magnetometry, near-field vectorial imaging, magnetically induced switching, and optical isolation.

scholarly journals Direct quantification of topological protection in symmetry-protected photonic edge states at telecom wavelengths

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Sonakshi Arora ◽  
Thomas Bauer ◽  
René Barczyk ◽  
Ewold Verhagen ◽  
L. Kuipers
Keyword(s):  
Near Field ◽  
Edge States ◽  
Quantum Networks ◽  
Hall Effects ◽  
Upper Limits ◽  
On Chip ◽  
Symmetry Protected ◽  
Topological Robustness ◽  
Direct Quantification ◽  
Sub Wavelength

AbstractTopological on-chip photonics based on tailored photonic crystals (PhCs) that emulate quantum valley-Hall effects has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information. We present a direct quantitative evaluation of topological photonic edge eigenstates and their transport properties in the telecom wavelength range using phase-resolved near-field optical microscopy. Experimentally visualizing the detailed sub-wavelength structure of these modes propagating along the interface between two topologically non-trivial mirror-symmetric lattices allows us to map their dispersion relation and differentiate between the contributions of several higher-order Bloch harmonics. Selective probing of forward- and backward-propagating modes as defined by their phase velocities enables direct quantification of topological robustness. Studying near-field propagation in controlled defects allows us to extract upper limits of topological protection in on-chip photonic systems in comparison with conventional PhC waveguides. We find that protected edge states are two orders of magnitude more robust than modes of conventional PhC waveguides. This direct experimental quantification of topological robustness comprises a crucial step toward the application of topologically protected guiding in integrated photonics, allowing for unprecedented error-free photonic quantum networks.

On-Chip Terahertz Near-Field Generation/Detection Scheme

2018 ◽  
Author(s):  
Dmitry S. Bulgarevich ◽  
Yusuke Akamine ◽  
Hideaki Kitahara ◽  
Valynn Katrine P. Mag-Usara ◽  
Hiroyuki Kato ◽  
...  
Keyword(s):  
Near Field ◽  
Detection Scheme ◽  
Field Generation ◽  
On Chip

Near-field measurements of soliton fission in nanophotonic waveguides

2014 ◽  
Author(s):  
C. Husko ◽  
M. Wulf ◽  
S. Combrie ◽  
A. De Rossi ◽  
L. Kuipers ◽  
...  
Keyword(s):  
Near Field ◽  
Field Measurements ◽  
Nanophotonic Waveguides ◽  
Soliton Fission

Atomic force microscopy imaging using a tip-on-chip: Opening the door to integrated near field nanotools

2010 ◽  
Vol 81 (9) ◽  
pp. 093707 ◽  
Author(s):  
J. Hayton ◽  
J. Polesel-Maris ◽  
R. Demadrille ◽  
M. Brun ◽  
F. Thoyer ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Near Field ◽  
Microscopy Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Atomic Force Microscopy Imaging ◽  
On Chip

scholarly journals Optical chromatography using a photonic crystal fiber with on-chip fluorescence excitation

2010 ◽  
Vol 18 (6) ◽  
pp. 6396 ◽  
Author(s):  
P. C. Ashok ◽  
R. F. Marchington ◽  
P. Mthunzi ◽  
T. F. Krauss ◽  
K. Dholakia
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Fluorescence Excitation ◽  
Crystal Fiber ◽  
On Chip

An LED-induced fluorescence detection system with integrated on-chip lens based on microfluidic chips technology/Ein LED-induziertes Fluoreszenzdetektionssystem mit integrierter „Lens-on-Chip“ basierend auf der mikrofluidischen Chiptechnologie

2013 ◽  
Vol 2 (1) ◽  
Author(s):  
Yingying Zhao ◽  
Qin Li ◽  
Xiao-Ming Hu ◽  
Dong-Fang Yang
Keyword(s):  
Optical Fibers ◽  
Detection Efficiency ◽  
Detection System ◽  
Research Work ◽  
Coupling Efficiency ◽  
Optical Excitation ◽  
Optical Signal ◽  
Microfluidic Chips ◽  
Fluorescence Excitation ◽  
On Chip

AbstractThe power density of optical excitation on microfluidic chips is attenuated due to the beam divergence of the optical fiber, making it difficult to collect either the emission or scattering light. The excitation power and coupling efficiency can be significantly increased by using an on-chip microlens system with integrated optical fibers, specially designed and simulated to reshape and collect the optical signal within the microfluidic chip.This article presents research work for designing, fabricating, and testing a type of on-chip microlens. The on-chip microlens was designed by Code VThe export light beam could be focused to a very small point to satisfy the requirements of the fluorescence excitation of samples. On the other hand, the detection efficiency could also be increased with the help of the on-chip microlens. The presented fabrication method does not require any assembly process or external driving force. To fabricate a microlens with a different focus, it is only necessary to change the figures on the mask. This technique can be used in a variety of applications as it is possible to produce customized microlens for specific applications.

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