Article
Chemistry, Multidisciplinary
Hideki Fujiwara, Kota Sudo, Yuji Sunaba, Christophe Pin, Shutaro Ishida, Keiji Sasaki
Summary: This study demonstrates controlled orbital rotation of a single fluorescent nanodiamond trapped by a gold trimer nanoantenna using either rotating linearly polarized light or circularly polarized light. The rotation direction is found to be opposite to the light's polarization rotation, and different excitation sequences and the generation of a Poynting vector vortex of reversed handedness are responsible for this inversion.
Article
Optics
J. R. Capers, D. A. Patient, S. A. R. Horsley
Summary: This study presents two methods to directly manipulate the complex frequencies of quasinormal modes in a material. The first method involves using eigenpermittivity to shift the structure and place a desired quasinormal mode at a specific frequency. The second method uses perturbation theory to iteratively modify the structure until a desired selection of quasinormal modes occurs at desired complex frequencies.
Article
Chemistry, Physical
Yuki Nakashima, Katsuaki Tanabe
Summary: The study calculates the enhancement factors of the electromagnetic field between hydrogen-absorbing transition metals and noble metals, showing large enhancements in nanogaps that can potentially be utilized for energy applications such as hydrogen storage, sensing, and nuclear fusion. The field enhancement factors are sensitive to the particle separation but not the position in the gap, indicating geometric flexibility for applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Hiroyuki Kishida, Maiken H. Mikkelsen
Summary: Graphene quantum dots (GQDs) are luminescent nanomaterials with desirable properties, but their long radiative lifetimes limit their use. This study achieved fast and bright luminescence by coupling gap plasmon modes to nanoparticle emitters, resulting in a significant reduction in radiative lifetime.
Article
Multidisciplinary Sciences
Hyungsik Kim, Young Duck Kim, Tong Wu, Qingrui Cao, Irving P. Herman, James Hone, Jing Guo, Kenneth L. Shepard
Summary: This study reports on the emission of bright visible light from single atoms bridging a graphene nanogap, as well as the observation of a negative differential resistance. Ionized oxygen atoms, after bridging carbon atoms in the nanogap, produce a high peak-to-valley current ratio and peak current density, demonstrating highly reproducible light emission.
Article
Chemistry, Multidisciplinary
Chun-Yuan Wang, Yungang Sang, Xinyue Yang, Soniya S. Raja, Chang-Wei Cheng, Haozhi Li, Yufeng Ding, Shuoyan Sun, Hyeyoung Ahn, Chih-Kang Shih, Shangjr Gwo, Jinwei Shi
Summary: This study demonstrates a strong coupling system achieved by coupling localized surface plasmon modes. Under specific conditions, a root N scaling of Rabi splitting energy is observed, along with a confirmed giant Rabi splitting in the visible spectral range. Additionally, the coupling strength reaches the ultrastrong coupling regime in some cases, representing about 10% of the mode energy.
Article
Astronomy & Astrophysics
Kai Lin, Yang-Yi Sun, Hongsheng Zhang
Summary: The study examines scalar perturbations in a dynamical Vaidya black hole and explores quasinormal modes using the matrix method. Proper boundary conditions for quasinormal modes in a dynamical black hole are determined for the first time. The results show that eigenfrequencies differ at the apparent horizon and null infinity due to finite velocity propagation of physical interactions.
Article
Chemistry, Analytical
Samir Adhikari, Emmanuel K. Ampadu, Minjun Kim, Daegwon Noh, Eunsoon Oh, Donghan Lee
Summary: Using surface-enhanced Raman scattering (SERS) techniques with plasmonic nanogap substrates, trace amounts of nitro-based compounds such as TNT, RDX, and PETN were effectively detected down to picomolar concentrations in solution. This method offers a powerful approach for identifying different explosives based on the variations in SERS spectra observed.
Article
Physics, Multidisciplinary
M. Mahmodi Moghadam, Sh Mobarakabadi
Summary: Theoretical analysis of hybrid plasmon polariton wave in a cylindrical conductor-gap-dielectric structure was conducted using the quantum hydrodynamic model. Numerical results showed that quantum effects had little impact on the dispersion relations of the wave, but that propagation was highly sensitive to the radius of the metal cylinder, gap layer thickness, and dielectric permittivity in the structure.
Article
Nanoscience & Nanotechnology
Qiang Zhao, Huan Yang, Bangbang Nie, Yongsong Luo, Jinyou Shao, Gang Li
Summary: A convenient and cost-effective fabrication method for metallic nanogaps was proposed, which combines photolithographic metal patterning, swelling-induced nanocracking, and superimposition metal sputtering. The fabricated nanogap array showed excellent performance for molecule measurements and demonstrated high sensitivity for single-molecule detection.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Multidisciplinary
Juanjuan Ren, Sebastian Franke, Stephen Hughes
Summary: In this study, a quasinormal-mode (QNM) theory is used to quantitatively model the classical dipole spontaneous emission response in coupled loss and gain resonators near an exceptional point. The QNMs provide a rich and accurate description of the system, highlighting the limitations of the classical picture of spontaneous emission.
Article
Astronomy & Astrophysics
Filipe S. Miguel
Summary: Recent research suggests that the strong cosmic censorship conjecture is violated by near-extremal RNdS and BTZ black holes, but respected by Kerr-dS black holes. The study demonstrates that the coincidence between exterior and interior quasinormal frequencies does not occur for RNdS or Kerr-dS, keeping the conclusions of earlier work valid.
Article
Physics, Applied
I. Khan, C. Howell, T. L. McGinnity, L. Li, R. K. Roeder, A. J. Hoffman
Summary: In this study, we demonstrate that the absorption spectrum of zinc oxide nanoparticles is influenced by nanoparticle morphology and anisotropy in the dielectric permittivity. We identify and characterize distinct modes in the absorption spectrum and show that their broadening and maxima are governed by the effects of anisotropy and interparticle coupling.
APPLIED PHYSICS LETTERS
(2023)
Article
Astronomy & Astrophysics
Jamie Bamber, Oliver J. Tattersall, Katy Clough, Pedro G. Ferreira
Summary: Perturbing the frequencies of quasi-normal modes of a black hole can reveal fundamental information about space-time, but existing research is often limited to static systems and pays little attention to dynamically growing black holes.
Article
Optics
Shu-cheng Lo, Chia-wei Lee, Ruey-lin Chern, Pei-kuen Wei
Summary: In this work, high-performance surface plasmonic sensors using gold nanostructures and Bragg photonic structures are presented. The hybrid Tamm-plasmon mode, resulting from the Fano coupling between higher order Tatum plasmon states and Bloch-wave surface plasmon polariton on the gold nanoslit array, demonstrates high surface sensitivity and resonant quality. The experimental results show that the hybrid mode has significantly higher sensitivity and better signal-to-noise ratios in biomolecular interaction measurement.
Review
Optics
Christophe Sauvan, Tong Wu, Rachid Zarouf, Egor A. Muljarov, Philippe Lalanne
Summary: This Review addresses the scattering of electromagnetic waves by resonant systems and focuses on representing the scattered field as a superposition of the excited quasinormal modes (QNMs). It discusses the fundamental concepts of normalization, orthogonality, and completeness, which are crucial for understanding the excitation strength and basis expansion of QNMs. The paper reviews recent achievements, debates on normalization, and introduces the concept of QNM regularization with complex coordinate transforms.
Article
Materials Science, Multidisciplinary
Anne Nguyen, Jean-Jacques Greffet
Summary: This study analyzes the trade-off between fast modulation and efficiency of nanoscale incandescent sources and compares harmonic modulation and pulse modulation.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Cedric Blanchard, Leo Wojszvzyk, Cecile Jamois, Jean-Louis Leclercq, Celine Chevalier, Lydie Ferrier, Pierre Viktorovitch, Ioana Moldovan-Doyen, Francois Marquier, Jean-Jacques Greffet, Xavier Letartre
Summary: In this study, we introduce thermal metallo-dielectric metasurfaces as sources in the mid-infrared (IR) range. The emitter consists of a lossy metal, and the spectral and angular emission are controlled by a periodic array of high refractive dielectric resonators. We present a design that allows independent control of the emission bandwidth and the angular aperture, while ensuring a large emissivity. To validate the concept, we fabricated and characterized a metasurface, which showed good agreement with the theoretical predictions.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Yuzhe Xiao, Mikhail A. Kats, Jean-Jacques Greffet, Qiang Li, Georgia T. Papadakis
Summary: Thermal radiation refers to the emission of electromagnetic waves from hot objects. The engineering applications of thermal radiation are an active field of research, involving multiple disciplines such as materials science, photonics, and thermal physics.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
N. Fayard, A. Bouscal, J. Berroir, A. Urvoy, T. Ray, S. Mahapatra, M. Kemiche, J. A. Levenson, J. -J. Greffet, K. Bencheikh, J. Laurat, C. Sauvan
Summary: This work proposes a new type of periodic dielectric waveguide that enables strong interactions between atoms and guided photons with unusual dispersion. Through computation, the researchers demonstrate that cold Rubidium atoms can be trapped as close as 100 nm from the structure, favoring emission into guided photons.
Article
Mathematics
Mondher Besbes, Christophe Sauvan
Summary: This paper studies the role of static modes in the expansion of quasinormal modes, and shows that static modes have a significant contribution to the reconstruction of the electromagnetic field when computed with a specific solver.
Article
Optics
V Blondot, C. Arnold, A. Delteil, D. Gerard, A. Bogicevic, T. Pons, N. Lequeux, J. P. Hugonin, J. J. Greffet, S. Buil, J. P. Hermier
Summary: We report the synthesis of hybrid light emitting particles with a diameter ranging from 100 to 500 nm, consisting of a compact CdSe/CdS/CdZnS semiconductor nanocrystal aggregate encapsulated by controlled nanometric size silica and gold layers. The addition of the gold nanoshell enhances the Purcell decay rate, as predicted by numerical simulations. Furthermore, we demonstrate the inhibition of Forster resonance energy transfer contribution.
Article
Optics
Hector Monin, Aurelian Loirette-Pelous, Eva De Leo, Aurelio A. Rossinelli, Ferry Prins, David J. Norris, Elise Baily, Jean-Paul Hugonin, Benjamin Vest, Jean-Jacques Greffet
Summary: We investigate the light emission of a patterned ensemble of colloidal quantum dots (cQDs) through experimental and theoretical study. Compared to a planar layer of cQDs, this system significantly modifies the emission spectrum and polarization. It demonstrates bright, directional, and polarized emission, including circular polarization in certain directions. We propose a light emission model based on a local Kirchhoff law, which accurately reproduces all experimental features. This model provides a quantitative figure of merit for assessing the emitted power. This work facilitates the systematic design of efficient ultrathin light emitting metasurfaces with controlled polarization, spectrum, and directivity.
Article
Optics
Anne Nguyen, Jean-Paul Hugonin, Anne-Lise Coutrot, Enrique Garcia-Caurel, Benjamin Vest, Jean-Jacques Greffet
Summary: This study reports the emission of polarized mid-wave infrared (MWIR) radiation from a 700 nm thick incandescent chiral metasurface. The polarization degree is above 0.5 with a circular polarization degree of 0.38 at 5 μm. The metasurface is heated by the Joule effect and the emission can be modulated beyond 10 MHz. This could enable detection techniques that use polarization as an additional degree of freedom.
Article
Optics
Aurelian Loirette-Pelous, Jean-Jacques Greffet
Summary: In this study, a new theoretical framework is built using established theoretical models and experimental results to explore the phenomena of photon Bose-Einstein condensation and photon thermalisation in semiconductors. The figures of merit for thermalisation and different experimental procedures are discussed. Finally, the fluctuations of the system and their relationship to different regimes are explored.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Laura Paggi, Alice Fabas, Hasnaa El Ouazzani, Jean-Paul Hugonin, Nikos Fayard, Nathalie Bardou, Christophe Dupuis, Jean-Jacques Greffet, Patrick Bouchon
Summary: The authors use low quality resonators to detect molecular absorption spectrum between 5 and 10 μm, resulting in improved system sensitivity.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Delphine Pommier, Zeilie Hufschmitt, Cheng Zhang, Yunhe Lai, Geirald Dujardin, Eric Le Moal, Christophe Sauvan, Jean-Jacques Greffet, Jianfang Wang, Elizabeth Boer-Duchemin
Summary: Quantum tunneling-driven optical nanoantennas play a vital role in the development of integrated plasmonic nanodevices. In this study, a tunneling junction between a nanoantenna and a thin gold film is used to electrically excite surface plasmons on the nanoscale. By employing an atomic force microscope, a novel method for completing the electrical circuit between the nanoantenna and the gold film is developed. Numerical modeling identifies the hybridized gap and antenna modes as the major contributors to the excitation of propagating surface plasmon polaritons.
Article
Optics
N. Fayard, I. Ferrier-Barbut, A. Browaeys, J. -J Greffet
Summary: This work proposes a protocol that bypasses the limitation of subradiant states by using a one-dimensional chain of N three-level atoms in a V-shaped configuration. The chain behaves as a time-varying metamaterial, enabling absorption, storage, and on-demand emission in a spectrally and spatially controlled mode. In the nonlinear regime, the transfer of doubly excited states from superradiant to subradiant states is demonstrated, providing a possible route for the optical characterization of their entanglement.
Article
Materials Science, Multidisciplinary
Elise Bailly, Kevin Chevrier, Camilo Perez De La Vega, Jean-Paul Hugonin, Yannick De Wilde, Valentina Krachmalnicoff, Benjamin Vest, Jean-Jacques Greffet
Summary: This article presents a technique to obtain the permittivity of fluorophores, such as dye molecules, from fluorescence measurements. The Brendel-Bormann model is found to accurately fit the emission spectra.
OPTICAL MATERIALS EXPRESS
(2022)
