Article
Physics, Multidisciplinary
Nan Cheng, Francesco Serafin, James McInerney, Zeb Rocklin, Kai Sun, Xiaoming Mao
Summary: Periodic lattices in hyperbolic space exhibit non-Euclidean crystallographic symmetries and non-abelian translation groups, allowing for high-dimensional irreducible representations. This paper presents a general framework for constructing wave eigenstates of high-dimensional irreps in infinite hyperbolic lattices, generalizing Bloch's theorem, and discusses its implications on mode counting, degeneracy, and bulk-edge correspondence.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Hamed Nikbakht, Bob van Someren, Manfred Hammer, B. Imran Akca
Summary: We developed a new approach to achieve compact and low-loss hybrid optical waveguides by utilizing the interaction of weak optical modes and combining high-index and low-index materials. By combining a low-index polymer and a thin layer of silicon nitride, we achieved a minimum bending radius of 90 μm (with a bending loss of 0.005 dB/90 degrees) and a propagation loss of 0.7 dB/cm. The viability of this technology was demonstrated through a series of high-performance novel photonic integrated circuit components. This hybrid waveguide platform, enabled by a powerful and simple design concept, holds great promise for high-density and low-loss PICs.
Article
Optics
Bipin K. Singh, Vaishali Bambole, Subhashish Tiwari, Kaushal K. Shukla, Praveen C. Pandey, Vipul Rastogi
Summary: The study focuses on the photonic bandgap characteristics of one-dimensional exponential graded photonic crystals in the microwave region, revealing that the number of photonic bands increases with the thickness of graded layers. The bandwidth of photonic band gaps can be tuned by modulating the refractive index of the graded layer.
Article
Optics
Chaohan Cui, Liang Zhang, Linran Fan
Summary: Making analogy with atomic physics has proven to be a powerful tool for photonic technology, leading to the generation of photonic entanglement and the modification of the Mollow triplet through the realization of different configurations of dressed states. This enables the investigation of complex atomic processes and the realization of unique quantum functionalities based on photonic systems.
Article
Optics
Khadijah Alnasser, Steve Kamau, Noah Hurley, Jingbiao Cui, Yuankun Lin
Summary: The study simulated the generation of 2D twisted moire photonic crystals and observed various modes and phenomena in photonic band gaps formed at different twisted angles, gradient levels, and dielectric filling factors. The findings suggest that these interesting discoveries may lead to applications of twisted moire photonic crystals in integrated photonics.
Article
Optics
M. Gryga, D. Ciprian, P. Hlubina, P. Pokorny, J. Sobota
Summary: One-dimensional photonic crystals (1DPhCs) combined with a thin Au layer are used to demonstrate Tamm resonances for potential sensor applications. Two different structures with TiO2/SiO2 bi-layers and a termination layer show Tamm resonances within different band gaps. The first structure exhibits wide band gaps over the visible and near-infrared spectral range, and the Tamm resonance depth and width depend on the thickness of the Au layer. The second structure, with band gaps in both spectral ranges, shows deep Tamm resonances for a 20 nm Au layer thickness.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Condensed Matter
M. Blanco de Paz, M. A. J. Herrera, P. Arroyo Huidobro, H. Alaeian, M. G. Vergniory, B. Bradlyn, G. Giedke, A. Garcia-Etxarri, D. Bercioux
Summary: This article studies the topological properties of various two-dimensional photonic crystal structures through the combined study of topological quantum chemistry, Wilson loop spectra, and electromagnetic energy density.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Optics
F. Villa-Villa, J. M. Gutierrez-Villarreal, H. Perez-Aguilar, J. A. Gaspar-Armenta
Summary: In this work, we studied the propagation length of Bloch modes along the surface between a bulk medium and a one-dimensional truncated photonic crystal. We found that the propagation length can vary depending on factors like the number of periods composing the photonic crystal, absorption of materials, and the roughness of involved surfaces. Bloch modes located at the center of bandgaps propagate longer distances than those residing near the edges.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Sofyan A. Taya, Nael Doghmosh, Anurag Upadhyay
Summary: This study investigates the transmission spectra characteristics of a binary PC structure consisting of silica and silver under different conditions, by introducing irregularities into the photonic crystal. The results show that increasing the thickness of the silver layer widens the band gaps, while increasing the angle of incidence causes a blue shift in the band gaps.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
Yunxiu Li, Jinyan Ning, Jinyang Xi, Shenghao Wang, Jiong Yang
Summary: Fluctuations in operating temperatures can have a significant impact on the efficiency of solar cells due to changes in the electronic structures of absorption layer materials. We used the EPR method to study the temperature dependence of the band gap of FeS2 and found that the band gap reduction caused by vibrations is small and can be explained by the counteracting influences of different phonon modes. Our analysis also revealed that the shortening of the S-S bond length and the change in the Fe-S bond length are responsible for the increase and decrease in the band gap of FeS2, respectively.
Article
Materials Science, Multidisciplinary
Mahendra Kumar, Surendra Prasad
Summary: Theoretical design of truncated one dimensional ternary photonic crystal was proposed to analyze the properties of transverse electric surface modes. By varying the thickness of different layers, it was found that surface modes can be strongly or weakly bounded to the interface. The study emphasized the potential practical applications in mid-infrared photonics, such as bio-chemical sensors and optical filters.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Mahendra Kumar, Surendra Prasad
Summary: This paper presents a theoretical investigation of interface modes at the interface of two isotropic dielectric photonic crystals. The dispersive properties for both sigma - polarized waves and pi - polarized waves are discussed, including dispersion curve, photonic band gap (PBG) shrinking - optical holes, and Brewster points. It is shown that interface modes are of prime importance for sigma - polarized waves, while only DD and DE type interface modes exist for pi - polarized waves. Additionally, only EE type interface modes exist for pi - polarized waves, which are completely transmitted through the photonic structure. Therefore, depending on the properties of the chosen materials, this photonic structure can have various applications in sensor design, optical filters, optical switches, etc., and is suitable for exploring the electromagnetic behavior at the interface of different media.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yong You, Yan-Ge Liu, Yundong Hao, Huiyi Guo, Zhi Wang
Summary: The study focused on the surface modes (SMs) in hollow-core photonic bandgap fiber (HC-PBF) and their impact on fiber performance, naming the SMs and studying their characteristics such as mode field shape, coupling bandwidth, and coupling speed. The study compared coupling characteristics of SMs with different core diameters and validated the theoretical analysis with actual fiber, aiming to deepen understanding of HC-PBF and positively impact its development.
IEEE PHOTONICS JOURNAL
(2022)
Article
Physics, Condensed Matter
W. Belhadj, N. Ben Ali, H. Dakhlaoui, O. H. Alsalmi, H. Alsaif, A. Torchani
Summary: This study investigates the optical features of an ultra-high quality factor cavity using a numerical approach based on the transfer-matrix method. The results show that a tunable ultra-high Q-factor is achievable by adjusting the structural parameters and graphene chemical potential. The observed tunable features of this high Q-factor cavity make it an ideal candidate for ultrasmall tunable narrowband filters and sensing devices.
EUROPEAN PHYSICAL JOURNAL B
(2021)
Article
Chemistry, Physical
Marcin Pastorczak, Katsiaryna Duk, Samaneh Shahab, Alexei A. Kananenka
Summary: Overtones and combinational modes are important in ultrafast vibrational energy relaxation in liquid water, but they are weak and often overlap with fundamental modes in isotopologues mixtures. We used femtosecond stimulated Raman scattering (FSRS) to measure the Raman spectra of H2O and D2O mixtures and compared the results with calculated spectra. We identified specific modes and bands and their contributions, which can provide insight into Raman spectra interpretation and vibrational relaxation pathways in isotopically diluted water systems.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Materials Science, Multidisciplinary
Cedric Kilchoer, Narjes Abdollahi, James A. Dolan, Doha Abdelrahman, Matthias Saba, Ulrich Wiesner, Ullrich Steiner, Ilja Gunkel, Bodo D. Wilts
ADVANCED OPTICAL MATERIALS
(2020)
Article
Chemistry, Physical
Philipp W. A. Schoenhoefer, Matthieu Marechal, Douglas J. Cleaver, Gerd E. Schroder-Turk
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Chemistry, Physical
Philipp W. A. Schoenhoefer, Matthieu Marechal, Douglas J. Cleaver, Gerd E. Schroeder-Turk
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Multidisciplinary Sciences
Marlous Kamp, Bart de Nijs, Nuttawut Kongsuwan, Matthias Saba, Rohit Chikkaraddy, Charlie A. Readman, William M. Deacon, Jack Griffiths, Steven J. Barrow, Oluwafemi S. Ojambati, Demelza Wright, Junyang Huang, Ortwin Hess, Oren A. Scherman, Jeremy J. Baumberg
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Chemistry, Physical
Tobias M. Hain, Michael A. Klatt, Gerd E. Schroder-Turk
JOURNAL OF CHEMICAL PHYSICS
(2020)
Review
Materials Science, Multidisciplinary
Alberto Alvarez-Fernandez, Cian Cummins, Matthias Saba, Ullrich Steiner, Guillaume Fleury, Virginie Ponsinet, Stefan Guldin
Summary: Optical metamaterials are artificially engineered structures with desired optical properties not found in nature, and bottom-up self-assembly methods such as BCP templating allow for tailored features at nanometer scales. The review explores optical phenomena arising from BCP-derived metamaterials, including dielectric and plasmonic characteristics, as well as diverse structural conformations and implementation in optical devices. Recent developments highlight unexplored opportunities for novel metamaterials and metasurface devices through BCP self-assembly.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Plant Sciences
Tobias M. Hain, Michal Bykowski, Matthias Saba, Myfanwy E. Evans, Gerd E. Schroeder-Turk, Lucja Kowalewska
Summary: Bicontinuous membranes in cell organelles demonstrate nature's ability to create complex nanostructures, with the SPIRE tool being able to accurately identify and analyze their features. Studying the structure of etioplasts reveals insights into storage capacities with different volume proportions and the role of plastid ribosome localization in their functioning.
Article
Materials Science, Multidisciplinary
Antonio Guenzler, Cedric Schumacher, Ullrich Steiner, Matthias Saba
Summary: This study presents a rigorous solution of Maxwell's equations in binary periodic materials using a combined Greens-Galerkin procedure. The method provides an accurate solution in regimes where homogenization theories fail and offers an explanation for the high fill fractions in the Maxwell-Garnett theory.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Physical
F. M. Schaller, H. Punzmann, G. E. Schroeder-Turk, M. Saadatfar
Summary: This paper explains the observations of a study on the X-ray computed tomography of granular ellipsoidal packings using a fundamental theoretical relationship for mixture distributions. The main finding is that the bi-disperse ellipsoidal packings studied can be interpreted as a mixture of two uncorrelated mono-disperse packings, insensitive to the compaction protocol.
Article
Materials Science, Multidisciplinary
Bilel Abdennadher, Rene Iseli, Ullrich Steiner, Matthias Saba
Summary: The circular dichroism (CD) is crucial for various applications, and artificial chiral materials have been developed due to the weak CD in natural materials. The chiro-optical effects can be enhanced by using layered chiral woodpile structures as photonic crystals or optical metamaterials. Our study reveals that light scattering at a chiral plasmonic woodpile can be understood by considering the evanescent Floquet states within the structure. Moreover, we demonstrate the existence of a broadband circular polarization bandgap in various plasmonic woodpiles, which could lead to an ultra-broadband circularly polarized thermal source.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Physics, Multidisciplinary
Stephan Wong, Matthias Saba, Ortwin Hess, Sang Soon Oh
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Cedric Kilchoer, Doha Abdelrahman, S. Narjes Abdollahi, Ava A. LaRocca, Ullrich Steiner, Matthias Saba, Ilja Gunkel, Bodo D. Wilts
ADVANCED PHOTONICS RESEARCH
(2020)
Article
Chemistry, Physical
Tianqi Sai, Matthias Saba, Eric R. Dufresne, Ullrich Steiner, Bodo D. Wilts
FARADAY DISCUSSIONS
(2020)
Article
Chemistry, Physical
Gerd E. Schroder-Turk
FARADAY DISCUSSIONS
(2020)
Article
Materials Science, Multidisciplinary
Matthias Saba, Stephan Wong, Mathew Elman, Sang Soon Oh, Ortwin Hess