A5030281266- Optical Coatings and Gratings
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Near-Field Optical Microscopy
- Advanced X-ray Imaging Techniques
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Optical measurement and interference techniques
- Advanced Fiber Optic Sensors
- Advancements in Photolithography Techniques
- Advanced Fiber Laser Technologies
- Metamaterials and Metasurfaces Applications
- Digital Holography and Microscopy
- Integrated Circuits and Semiconductor Failure Analysis
- Semiconductor Lasers and Optical Devices
- Advanced Measurement and Metrology Techniques
- Advanced optical system design
- Adaptive optics and wavefront sensing
- Liquid Crystal Research Advancements
- X-ray Spectroscopy and Fluorescence Analysis
- Surface Roughness and Optical Measurements
- Electrowetting and Microfluidic Technologies
- Electromagnetic Simulation and Numerical Methods
- Optical Polarization and Ellipsometry
- Mechanical and Optical Resonators
Delft University of Technology
2016-2025
KTH Royal Institute of Technology
2021
The Hague University of Applied Sciences
2019
Philips (Netherlands)
2000-2018
NXP (Netherlands)
1988-2018
ITMO University
2018
VSL Dutch Metrology Institute
2012-2017
Physikalisch-Technische Bundesanstalt
2014
Institute for Magnetospheric Physics
2006-2011
Philips (Finland)
1992-2007
A high index dielectric nano-sphere can be excited and yet remain radiationless. method to excite the non-radiating anapole mode of a isotropic nanosphere is presented. With tightly focused radially polarized beam illumination, main-contributing electric dipole magnetic modes zero with only weak quadruple contributing total scattering. Further, standing wave illumination formed by two counter-propagating under $4\pi$ configuration, ideal radiationless ananpole excited.
We experimentally demonstrate long distance measurements with a femtosecond frequency comb laser using dispersive interferometry. The is derived from the unwrapped spectral phase of dispersed interferometer output and repetition laser. For an length 50 m this approach has been compared to independent counting interferometer. obtained mutual agreement better than 1.5 μm (3×10(-8)), statistical averaging less 200 nm. Our experiments that interferometry powerful method for accurate...
PURPOSE: To describe the radiologic findings of susceptibility changes in acute middle cerebral artery (MCA) thromboembolism detected with three-dimensional (3D) susceptibility-based perfusion magnetic resonance (MR) imaging and to compare detectability clinical value this sign those hyperdense MCA at computed tomography (CT). MATERIALS AND METHODS: Twenty-three patients (mean age, 55 years) underwent CT MR within first 6 hours after onset stroke. The presence as depicted on T2*-weighted 3D...
We experimentally demonstrate that a femtosecond frequency comb laser can be applied as tool for long-distance measurement in air. Our method is based on the of cross correlation between individual pulses Michelson interferometer. From position functions, distances up to 50 m have been measured. compared this counting interferometer, showing an agreement with measured distance within 2 μm (4×10−8 at m).
Circularly polarized electric fields incident on subwavelength apertures produce near-field phase singularities with vorticity $\ifmmode\pm\else\textpm\fi{}1$ depending the polarization handedness. These combine those associated orbital angular momentum and result in polarization-dependent transmission. We arbitrary longitudinal component of scattered by varying beam aperture configuration.
We present a comparison among several fully-vectorial methods applied to basic scattering problem governed by the physics of electromagnetic interaction between subwavelength apertures in metal film. The modelled structure represents slit-groove silver film deposited on glass substrate. benchmarked methods, all which use in-house developed software, include broad range approaches from finite-element volume-integral and finite-difference time domain various types modal based different...
The acetone concentration exhaled in the breath of three type 1 diabetes patients (two minors and one adult) healthy volunteer is studied using a quantum cascade laser-based spectroscopic system. Using signature between 1150 1250 cm–1 multiline fitting method, variations on order parts per billion by volume were measured. Blood glucose ketone concentrations blood measurements performed simultaneously to study their relation with breath. We focus personalized studies better understand role...
Abstract With the increasing use of ultrasonography, especially in medical imaging, novel fabrication techniques together with sensor designs are needed to meet requirements for future applications like three-dimensional intercardiac and intravascular imaging. These require arrays many small elements selectively record sound waves coming from a certain direction. Here we present proof concept an optical micro-machined ultrasound (OMUS) fabricated semi-industrial CMOS line. The is based on...
Abstract Typically, metal particles are difficult to manipulate with conventional optical vortex (OV) tweezers, because of their strong absorption and scattering. However, it has been shown that the field surface plasmonic polaritons, called (PV), is capable stable trapping dynamic rotation particles, especially those mesoscopic Mie size. To uncover different physical mechanisms OV PV we investigated force distribution potential particles. In tweezers stronger scattering causes a positive...
Hybridization in the narrow gaps between surface plasmon polaritons (SPPs) along a metal and localized plasmons on metallic nano-objects strongly enhance electromagnetic field. Here, we employ plasmonic hybridization to achieve dynamic trapping manipulation of single nanowire flat surface. We reveal that achieved by exciting tweezers with linearly polarized laser beam could induce strong forces large rotational torques nanowire. The position orientation dynamically be controlled...
Carrying orbital angular momentum per photon, the optical vortex has elicited widespread interest. Here, we demonstrate that dual coaxial longitudinal polarization vortices can appear upon a nonparaxial propagation of tightly focused Pancharatnam-Berry tailored Laguerre-Gaussian beam. Most importantly, it is capable accessing arbitrary independent topological charges for both vortices, as well predesigned tunable spacing distances between them.
Shortly after their inception, superconducting nanowire single-photon detectors (SNSPDs) became the leading quantum light detection technology. With capability of detecting single-photons with near-unity efficiency, high time resolution, low dark count rate, and fast recovery time, SNSPDs outperform conventional techniques. However, lower energy single photons ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mo form="prefix"><</mml:mo>...
Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers.With the gradual increase intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise sequence thereby modulate nonlinear properties materials.In current traps, however, underlying physical mechanism is mainly confined within regime because threshold values required to excite RSA are extremely high.Herein, we demonstrate, both theory experiment, tweezing regime, proving that a fascinating...
Ptychographic extreme ultraviolet (EUV) diffractive imaging has emerged as a promising candidate for the next generationmetrology solutions in semiconductor industry, it can image wafer samples reflection geometry at nanoscale. This technique surged attention recently, owing to significant progress high-harmonic generation (HHG) EUV sources and advancements both hardware software computation. In this study, novel algorithm is introduced tested, which enables wavelength-multiplexed...
The application of wire grid polarizers as efficient polarizing beam splitters for visible light is studied. large differences between the transmissivity different polarizations are explained qualitatively by using theory metallic wave guides. results rigorous calculations obtained finite element method compared with experiments both classical and conical mount. Furthermore wire-grid in liquid crystal on silicon display systems considered.
A fast noninvasive method based on scattering from a focused radially polarized light to detect and localize subwavelength nanoparticles substrate is presented. The technique relies polarization matching in the far field between scattered spurious reflected fields. Results show localization uncertainty of ≈10^{-4}λ^{2} possible for particle area ≈λ^{2}/16. effect simple pupil shaping also shown.
Exhaled breath analysis is a potential non-invasive tool for diagnosing and monitoring airway diseases. Gas chromatography-mass spectrometry electrochemical sensor arrays are the main techniques to detect volatile organic compounds (VOC) in exhaled breath. We developed broadband quantum cascade laser spectroscopy technique VOC detection identification. The objective of this study was assess repeatability profiling with laser-based explore clinical applicability by comparing samples from...
Optical scatterometry is the state of art optical inspection technique for quality control in lithographic process.As such, any boost its performance carries very relevant potential semiconductor industry.Recently we have shown that coherent Fourier (CFS) can lead to a notably improved sensitivity reconstruction geometry printed gratings.In this work, report on implementation CFS instrument, which confirms predicted performances.The system, although currently operating at relatively low...
Optical angular momenta (AM) have attracted tremendous research interest in recent years. In this paper we theoretically investigate the electromagnetic field and momentum properties of tightly focused arbitrary cylindrical vortex vector (CVV) input beams. An absorptive particle is placed CVV fields to analyze optical torques. The spin-orbit motions can be predicted controlled when influences different parameters, such as topological charge, polarization initial phases, are taken into...
In the theory of partial coherence, coherence singularities can occur in spectral degree (SDOC): case fields at two different points are completely uncorrelated, phase SDOC is undefined. For a partially coherent vortex beam, detection linked to measurement topological charge, whose magnitude equals number ring dislocations its far field amplitude. However, distribution rarely mentioned literature and amplitude hardly reflect sign charge. this letter, we present phase-analysis method for...
We propose and experimentally demonstrate a noniterative diffractive imaging method for reconstructing the complex-valued transmission function of an object illuminated by spatially partially coherent light from far-field diffraction pattern. Our is based on pinhole array mask, which specially designed such that correlation in mask plane can be obtained directly inverse Fourier transforming Compared to traditional iterative methods using illumination, our robust degradation spatial coherence...