Article
Optics
Yago Arosa, Raul de la Fuente
Summary: Four different methods were analyzed for determining the group index by measuring the material dispersion in spectrally resolved white-light interferometry. Each method was evaluated for efficacy and advantages and drawbacks, considering the typical measurement range of a CCD camera from 400 to 1000 nm. Testing was conducted with two different samples, yielding similar results in both cases. Only methods requiring the acquisition of a few frames were considered.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Sunil Dahiya, Akansha Tyagi, Ankur Mandal, Thomas Pfeifer, Kamal P. Singh
Summary: This study demonstrates an ultrathin white light interferometer with picometer resolution achieved through wavefront division and self-calibration, suitable for measuring coherence length of submicrometer broadband incoherent sources, and proposes a versatile double-pass configuration.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Weifeng Jiang, Yangyang Zhu, Guofu Yin, Houhong Lu, Luofeng Xie, Ming Yin
Summary: This study establishes a mapping between the structural topology and the dispersion relation of elastic metamaterials using deep learning approaches. The proposed model accurately predicts the dispersion relation for a given structure and enables the inverse design of near-optimal structures based on the target dispersion relation. The deep learning-based approaches have shown capability in accelerating the design and optimization process, paving the way for new breakthroughs in metamaterials research.
MATERIALS TODAY PHYSICS
(2022)
Article
Optics
Qi Sun, James Williamson, Tom Vettenburg, David B. Phillips, Haydn Martin, Gilberto Brambilla, Xiangqian Jiang, Martynas Beresna
Summary: White light interferometry is a non-contact method for surface topography measurement. In this study, a new form of spectral interferometry utilizing an engineered scattering chip and a camera was demonstrated. By directly measuring the relationship between surface depth and white light speckle pattern, high-resolution surface profile measurements were achieved. This work opens up possibilities for developing compact and affordable white light interferometers with various applications in distance, strain, temperature, pressure measurements, etc.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Nathalie Destouches, Nipun Sharma, Marie Vangheluwe, Nicolas Dalloz, Francis Vocanson, Matthieu Bugnet, Mathieu Hebert, Jan Siegel
Summary: The technique of laser processing of nanocomposites allows for controlling the statistical properties of random metasurfaces, enabling multiplexing of multiple images. By manipulating absorption and interference effects, as well as the anisotropy of plasmonic nanoparticles, colors in reflection and transmission can be altered independently under white light, facilitating multiplexing of multiple images.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Optics
Jianshan Wang, Xiaohan Xie, Na Li, Jie Dong, Shuailing Wang, Yiqing Wang, Xingze Qiu, Jingping Xu, Yaping Yang
Summary: This article presents the design of pure passive white light cavities without the need for negative dispersion medium. The negative dispersion property of the cavity wall is achieved using two metal coatings with different reflection coefficients. Additionally, the performance of the white light cavities can be improved by employing atomic gas.
Article
Optics
Qiang Liu, Shi-Min Li, Da-Peng Zhou, Zhenguo Jing, Wei Peng
Summary: The proposed dynamic fiber-optic white light interferometry based on the compressed-sensing principle offers a new method for efficient spectrum data acquisition. By compressively sampling the interference spectra of a Fabry-Perot cavity, high acquisition rates can be achieved, as demonstrated by numerical simulations and nanometer-scale vibration experiments.
Article
Astronomy & Astrophysics
Daniel Vech, David M. Malaspina, Cynthia Cattell, Steven J. Schwartz, Robert E. Ergun, Kristopher G. Klein, Lily Kromyda, Alexandros Chasapis
Summary: This paper investigates electrostatic waves with time-dependent frequency features in the terrestrial foreshock, identifying significant frequency drift and peak power shifts. Analysis of data from the Magnetospheric Multiscale Mission reveals 46 wave packets with upstream propagation directions but downstream convection towards the bow shock. Interferometric analysis and comparison with theoretical waves show good agreement with Doppler shifted ion acoustic waves, suggesting potential mechanisms involving impulsive reflected ions in the growth of these waves.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Environmental Sciences
Jorge Nicolas-Alvarez, Xavier Carreno-Megias, Estel Ferrer, Miquel Albert-Gali, Judith Rodriguez-Tersa, Albert Aguasca, Antoni Broquetas
Summary: Future GEOSAR missions will provide permanent monitoring of continental areas of the planet with revisit times of less than 24 h. Different countries have conducted research on GEOSAR missions with applications including water cycle monitoring and early warning of disasters. The precision orbit determination technique proposed in this study, based on interferometry, has been experimentally validated and shown consistency and feasibility in tracking GEOSAR satellites.
Article
Engineering, Electrical & Electronic
Guoqiang Wen, Hongxia Zhang, Tianyue Li, Jiayi Qu, Dagong Jia, Tiegen Liu
Summary: This study proposes a new method for measuring 10-km polarization-maintaining fibers (PMFs) using all-fiber white light interferometry and dispersion compensation based on frequency-domain transformation, which improves measurement accuracy and spatial resolution.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Yago Arosa, Carlos Damian Rodriguez-Fernandez, Alejandro Doval, Elena Lopez Lago, Raul de la Fuente
Summary: The uncertainties of refractive and group index in dispersion measurement by spectrally resolved white light interferometry were analyzed in depth. The study identified the contributions of various parameters affecting these indices, presented results for a fused silica sample, and established the effects that most deteriorate measurement accuracy. Finally, the total uncertainty of the two indices was determined by quadratically combining the different contributions.
Article
Optics
Semyon Goncharov, Kilian Fritsch, Oleg Pronin
Summary: In this study, supercontinuum generation and pulse compression are achieved in two stacked multipass cells using dielectric mirrors. The 230 fs pulses at 1 MHz with 12 μJ energy are compressed by a factor of 33, resulting in 7 fs pulses with a peak power of 1.0 GW and an overall transmission of 84%. This light source is particularly suitable for applications such as time-resolved angle-resolved photoemission spectroscopy (ARPES), photoemission electron microscopy, and nonlinear spectroscopy.
Article
Optics
Petr Bouchal, Radim Chmelik, Zdenek Bouchal
Summary: The study reveals the connection between white-light phase and optical path difference using the self-coherence function of spatially incoherent light, and utilizes an associated field to restore the cumulative OPD. This method is crucial for quantitative phase microscopy, but processing beyond quasi-monochromatic approach is still lacking.
Article
Engineering, Electrical & Electronic
Qiang Liu, Zhenguo Jing, Yueying Liu, Ang Li, Zhenjie Xia, Wei Peng
Summary: A novel laser frequency modulated phase-shifting white-light interferometry (PS-WLI) is proposed to absolutely demodulate the cavity length of dynamic low-finesse Fabry-Perot sensor. By combining the advantages of frequency-switched two-step phase shifting interferometry and scanning WLI, the method can achieve absolute measurement with high sampling rate, effectively demodulating vibration signals between 0.5 to 20 kHz.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Kaihua Cui, Qian Liu, Xiaojin Huang, Hui Zhang, Lulu Li
Summary: This study presents an algorithm to detect and compensate for scanning error in white-light interferometry, which can achieve high-accuracy measurements under interference and relax the environment requirements for white-light interferometer applications.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Anne-Sophie Munser, Marcus Trost, Sven Schroeder, Martina Graf, Miriam A. Rosenbaum, Andreas Tuennermann
Summary: Due to its high sensitivity and quick measurement principle, angle-resolved scattering (ARS) measurements show promising potential as a rapid analysis tool for bacterial cells, especially at small sample sizes and low cell numbers. This study has demonstrated that scattered light from various bacterial cell samples can be analyzed at the single-cell level, which is a significant benefit compared to time-consuming conventional methods that require hours or days of cellular growth. With the proposed setup and data analysis method, it is possible to detect scatter differences among cell types as well as measure cell concentration.
Article
Chemistry, Multidisciplinary
Nabarun Polley, Samim Sardar, Peter Werner, Ingo Gersonde, Yuya Kanehira, Ilko Bald, Daniel Repp, Thomas Pertsch, Claudia Pacholski
Summary: In this research, optical fibers equipped with plasmonic flow sensors were fabricated as photothermomechanical nanopumps for active transport of target analytes. The nanopumps were prepared by stacking a thermoresponsive polymer monolayer and a plasmonic nanohole array on an optical fiber tip. The pump mechanism relied on the temperature-dependent collapse and swelling of the polymer, while the required heat was generated by the photo thermal effect in the plasmonic nanohole array. Simultaneous detection of analytes was achieved by monitoring changes in the plasmonic sensor's optical response. The active mass transport through the nanohole array was visualized using particle imaging velocimetry. The presence of the pump mechanism led to a 4-fold increase in sensitivity compared to the purely photothermal effect, demonstrating the potential of these photothermomechanical nanopumps for sensing applications.
Article
Optics
Daniel Repp, Angela Barreda, Francesco Vitale, Isabelle Staude, Ulf Peschel, Carsten Ronning, Thomas Pertsch
Summary: Semiconductor nanowire lasers can have their lasing threshold modified by their environment, and using metallic substrates can access low-volume Surface-Plasmon-Polariton (SPP) modes and describe mode competition in nanowire lasers. The study found that an aluminum substrate decreases the lasing threshold for ZnO nanowire lasers, while a silver substrate increases the threshold compared to a dielectric substrate. These findings allow for predictions about the interaction between planar metals and semiconductor nanowires, guiding future improvements in highly-integrated laser sources.
Article
Materials Science, Multidisciplinary
Chengjun Zou, Purushottam Poudel, Sarah L. Walden, Katsuya Tanaka, Alexander Minovich, Thomas Pertsch, Felix H. Schacher, Isabelle Staude
Summary: Tunability is crucial for practical applications of high-efficiency metasurface-based nanophotonic devices and systems. The research in this area has made significant progress in terms of tuning mechanisms, speed, and active functionalities. However, most of the demonstrated works are based on a single type of physical stimulus, which limits the modulation range and design options of the metadevices. This article experimentally demonstrates that multi-responsive metasurfaces can be achieved by combining asymmetric, highly resonant metasurfaces with multi-responsive polymeric materials, providing new design freedom for multifunctional metadevices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Valerio Flavio Gili, Dupish Dupish, Andres Vega, Massimo Gandola, Enrico Manuzzato, Matteo Perenzoni, Leonardo Gasparini, Thomas Pertsch, Frank Setzpfandt
Summary: Quantum ghost imaging (QGI) is an imaging protocol that exploits photon-pair correlations from spontaneous parametric down-conversion (SPDC). In this study, a two-dimensional single-photon avalanche diode (SPAD) array detector is used for spatially resolving the path in QGI implementation. By utilizing non-degenerate SPDC, samples can be investigated at infrared wavelengths without the need for SWIR cameras, while spatial detection can still be performed in the visible region using silicon-based technology. These findings advance QGI schemes for practical applications.
Article
Physics, Applied
F. Vitale, D. Repp, T. Siefke, U. Zeitner, U. Peschel, T. Pertsch, C. Ronning
Summary: In this study, a mode selection scheme based on distributed feedback was proposed to achieve quasi-single mode lasing action in plasmonic nanowires. The orientation of the nanowire on the grating was found to affect the emission spectrum, with an additional peak emerging when the nano-cavity was perpendicular to the ridge direction. This peak was attributed to a hybrid mode dominating the mode competition and supported by localized plasmon polaritons on the metal grating ridges.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Aso Rahimzadegan, Sergey Lepeshov, Wenjia Zhou, Duk-Yong Choi, Juergen Sautter, Dennis Arslan, Chengjun Zou, Stefan Fasold, Carsten Rockstuhl, Thomas Pertsch, Yuri Kivshar, Isabelle Staude
Summary: Introduced metasurfaces as promising candidates to replace bulky optical components, and explored dielectric metasurfaces with complex supercells composed of Mie-resonant dielectric nanocylinders and nanoscale rings. Demonstrated the signature of an optical response relying on staggered optically induced magnetic dipole moments, and suggested possible applications in resonant nanophotonics by broadening the modulation capabilities of metasurfaces.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Yunus Denizhan Sirmaci, Angela Barreda Gomez, Thomas Pertsch, Jens H. Schmid, Pavel Cheben, Isabelle Staude
Summary: The paper proposes and demonstrates a novel silicon nanophotonic waveguide consisting of a chain of resonantly forward scattering nanoparticles with spectrally overlapping electric and magnetic dipolar Mie-type resonances. The propagation loss of the meta-waveguides in the telecom spectral range is as low as 0.4 dB mm(-1), surpassing the current record for Mie-resonant waveguides by more than an order of magnitude. The meta-waveguides also support a negative group index over a broad spectral range and exhibit regions of vanishing and anomalous dispersion within the transmission band. Furthermore, compact resonance-protected waveguide bends and efficient splitters can be implemented within just 320 nm propagation length.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Fatemeh Abtahi, Pallabi Paul, Sebastian Beer, Athira Kuppadakkath, Anton Pakhomov, Adriana Szeghalmi, Stefan Nolte, Frank Setzpfandt, Falk Eilenberger
Summary: Second-harmonic generation (SHG) is observed in periodic stacks of alternating, subwavelength dielectric layers due to the broken symmetry at the surface. The surface SHG is significantly enhanced by the large number of surfaces in these stacks. Experimental results on SiO2/TiO2 multilayer stacks grown by PEALD demonstrate substantial SHG under large angles of incidence, surpassing that of simple interfaces. The experimental results are in agreement with theoretical calculations.
Article
Materials Science, Multidisciplinary
Viktor Bender, Tobias Bucher, Mohammad Nasimuzzaman Mishuk, Yuxuan Xie, Isabelle Staude, Falk Eilenberger, Kurt Busch, Thomas Pertsch, Bayarjargal N. Tugchin
Summary: Photoluminescence spectroscopy is used to study the excitonic properties of mechanically exfoliated monolayer MoS2 under various physical and chemical stimuli. The study characterizes midgap exciton states originating from lattice defects and compares them to existing models. Statistical data analyses reveal a photoluminescence enhancement through physisorption of water molecules on the controversial excited-state A biexciton (AXX*). Additionally, the study shows that surface roughness does not account for changes in doping level within monolayer MoS2 on gold substrates, and reports a shift in the electron-phonon coupling properties due to physisorbed water films on top of the samples.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Multidisciplinary Sciences
Xuchen Wang, Mohammad Sajjad Mirmoosa, Viktar S. Asadchy, Carsten Rockstuhl, Shanhui Fan, Sergei A. Tretyakov
Summary: Photonic time crystals are artificial materials with spatially uniform but temporally varying electromagnetic properties. This study extends the concept of photonic time crystals to two-dimensional artificial structures called metasurfaces. By designing a microwave metasurface, the researchers confirmed the existence of momentum bandgaps and exponential wave amplification, demonstrating the potential of metasurfaces as a material platform for emerging photonic space-time crystals and for amplifying surface-wave signals in wireless communications.
Article
Nanoscience & Nanotechnology
Maryam Moradi, Isabelle Staude, Thomas Pertsch, Michael Jaeger, Ulrich S. Schubert
Summary: By utilizing a spin-coating-based sample fabrication procedure, we developed a gold-quantum dot hybrid system that exhibited reversible photoluminescence switching in response to redox processes. The system relied on a nanometric thick polymer spacer layer that was redox-responsive, enabling attachment of the quantum dots to a gold film. The study demonstrated a reversible and reproducible 2.3 ± 0.6-fold photoluminescence intensity switching factor upon oxidation and reduction of the spacer layer.
ACS APPLIED NANO MATERIALS
(2023)
Article
Optics
Dominik Beutel, Ivan Fernandez-Corbaton, Carsten Rockstuhl
Summary: The evaluation of lattice sums is necessary for analyzing the interaction between objects on a lattice. In electromagnetic scattering scenarios involving arrays of particles forming metamaterials, metasurfaces, or photonic crystals, Ewald's method can improve the convergence of lattice sums. This study presents a derivation of exponentially convergent series for the solutions of the Helmholtz equation, specifically for different dimensional cases and involving the interaction of sublattices. The derived formulas are applicable to various multipolar orders and have been validated through comparison with direct computation of lattice sums.
Article
Optics
Chang Liu, Wilhelm Eschen, Lars Loetgering, Daniel Penagos S. Molina, Robert Klas, Alexander Iliou, Michael Steinert, Sebastian Herkersdorf, Alexander Kirsche, Thomas Pertsch, Falk Hillmann, Jens Limpert, Jan Rothhardt
Summary: Table-top extreme ultraviolet (EUV) microscopy provides new possibilities for studying biological samples without using labels. In this study, we demonstrate ptychographic EUV imaging of dried, unstained model specimens, such as germlings of a fungus and bacteria cells, at a wavelength of 13.5 nm. By using a position-correlated ptychography approach, we achieve a millimeter-squared field of view with sub-60 nm spatial resolution, enabling the identification of nanoscale material composition inside the specimens. This work will advance EUV imaging applications and open up new possibilities in life science research.
Article
Chemistry, Multidisciplinary
Benedikt Zerulla, Dominik Beutel, Christof Holzer, Ivan Fernandez-Corbaton, Carsten Rockstuhl, Marjan Krstic
Summary: This article introduces a novel multi-scale approach for simulating the nonlinear optical response of molecular materials. The approach combines ab initio quantum-chemical and classical Maxwell-scattering computations. By incorporating the first hyperpolarizability tensor computed with time-dependent density-functional theory into a multi-scattering formalism, the optical interaction between neighboring molecules is considered. The approach is versatile and accurate, making it suitable for exploring nonlinear photonic molecular materials in structured photonic environments in the future.
ADVANCED MATERIALS
(2023)
