Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session N26: Nanostructures and Metamaterials IIFocus Recordings Available
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Sponsoring Units: DMP DCMP Chair: Leena Singh, Los Alamos National Laboratory Room: McCormick Place W-187B |
Wednesday, March 16, 2022 11:30AM - 11:42AM |
N26.00001: Long-range dipole-dipole interactions in a plasmonic lattice. Ashwin K Boddeti, Jun Guan, Tyler Sentz, Xitlali G Juarez, Ward Newman, Cristian L Cortes, Teri W Odom, Zubin Jacon Spontaneous emission of quantum emitters can be enhanced by increasing the local density of optical states whereas engineering dipole-dipole interactions require modifying the two-point spectral density function. Here, we experimentally demonstrate long-range dipole-dipole interactions (DDIs) mediated by surface lattice resonances in a plasmonic nanoparticle lattice. Using angle-resolved spectral measurements and fluorescence lifetime studies, we show that unique hybrid plasmonic modes mediate long-range DDI between donor and acceptor molecules. The fluorescence lifetime measurements show density-dependent non-exponential decay dynamics. We observe significant and persistent long-range dipole-dipole |
Wednesday, March 16, 2022 11:42AM - 11:54AM |
N26.00002: Systematic design of topological metamaterials by symmetry relaxation Cyrill Bösch, Frank Schindler, Andreas Fichtner, Tena Dubcek, Marc Serra Garcia We present a method based on mathematical optimization to systematically design topological metamaterials. The method is combined with the adjoint gradient technique which allows us to design systems with a large number of design parameters, such as they appear in finite element simulations. |
Wednesday, March 16, 2022 11:54AM - 12:06PM |
N26.00003: Effect of Coupling on Hysteretic rf SQUID metamaterials Jingnan Cai, Steven M Anlage, Tamin Tai
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Wednesday, March 16, 2022 12:06PM - 12:18PM |
N26.00004: Dynamics of Near-Field Radiative Heat Transfer in Ensembles of Nanostructures Wilton J De Melo Kort-Kamp, Stephen Sanders, Lauren Zundel, Diego Dalvit, Alejandro Manjavacas The thermal radiation exchanged between bodies separated by macroscopic distances is accurately described by Planck's law. However, this description breaks down when the distance between objects or their size becomes significantly smaller than the so-called thermal wavelength. In this limit, the contribution of near-field components of the electromagnetic field, together with the strong responses provided by the optical resonances of nanostructures, results in enhanced radiative heat transfer, which can surpass the blackbody limit by several orders of magnitude. We introduce a theoretical framework to describe the temporal dynamics of near-field heat radiative heat exchange in ensembles of nanostructures, which is based on the use of an eigenmode expansion of the equations that govern this process. Using this formalism, we identify the fundamental principles that determine the thermalization of collections of nanostructures, revealing general but often unintuitive dynamics. Our results provide an elegant, precise, and efficient approach to investigate the temporal dynamics of radiative heat transfer in systems containing a large number of nanoparticles. |
Wednesday, March 16, 2022 12:18PM - 12:30PM |
N26.00005: Low Temperature Growth of Germanium Oxide Nanowires by Template Based Self Assembly and their Raman Characterization Supriyo Bandyopadhyay, Raisa Fabiha, Abigail H Casey, Gregory E Triplett We have synthesized ∼100 nm diameter GeO2 nanowires by electrodepositing Ge within the nanopores of anodized alumina films on aluminium substrates from an electrolyte, and then oxidizing the nanowires in air at ambient temperature for 24 hours, to form GeO2 nanowires. These nanowires have been imaged with scanning electron microscopy that shows excellent control over the diameter which varies by less than 10%. The nanowire length is more variable, with the maximum length being about 3 μm. They are vertically standing nanowires surrounded by alumina with the top exposed to air and the bottom in contact with the aluminum substrate. Plasmons from the aluminum substrate couple into the nanowires and affect their phonon modes. The plasmon coupling changes the phonon energies and spawns new phonon modes. The Raman spectra of the nanowires show the usual low wavenumber peaks characteristic of phonons in GeO2 nanowires (with slight wavevector shifts), but we also observe two unusual high wavenumbers peaks that could possibly be due to phonon-plasmon coupling. |
Wednesday, March 16, 2022 12:30PM - 12:42PM |
N26.00006: Hot Electrons and Photochemical effects in Chiral Plasmonic Nanostructures Alexandre O Govorov, Oscar R Avalos-Ovando, Lucas V Besteiro The generation of energetic (hot) electrons and the photo-heating effect are intrinsic properties of any optically excited plasmonic nanocrystal [1,2]. High-energy hot electrons and phototemperature contribute to kinetic processes observed in plasmonic photodetectors, colloidal nanocrystals, and metastructures [1,2]. This talk will focus on the theory of hot electron generation and also present related applications for plasmonic photochemistry and chiral plasmonic photocatalysis [3,4,5]. |
Wednesday, March 16, 2022 12:42PM - 12:54PM |
N26.00007: Sandwiched Plasmonic Nanoparticle Lattices for White-Light Lasing Jun Guan, Ran Li, Xitlali G Juarez, Alexander D Sample, Yi Wang, George C Schatz, Teri W Odom This talk describes how a plasmonic nanolaser architecture can be designed to produce white-light lasing. We constructed a laser device based on a mixed dye solution sandwiched between two aluminum nanoparticle (NP) square lattices of different periodicities. The cavity modes were determined by two band-edge modes in one NP lattice and one band-edge mode in the other NP lattice. From a single lattice, simultaneous red and blue lasing was achieved using a binary dye solution, and the relative intensities of the two colors depended on the volume ratio of the dyes. Incorporating three dyes into the sandwich structure and optimizing their mixing ratios enabled simultaneous blue, green, and red lasing for a white-light emission profile. |
Wednesday, March 16, 2022 12:54PM - 1:06PM |
N26.00008: Purcell enhanced Er3+- ion fluorescence in a single nano-de-focusing plasmonic waveguide Nicholas A Gusken, Ming Fu, Maximilian Zapf, Michael Nielsen, Paul Dichtl, Robert Roeder, Carsten Ronning, Stefan A Maier, Rupert F Oulton Enhancing quantum emitter fluorescence by tailoring its electromagnetic environment on the nanoscale is key for realizing brighter light sources with associated control over their modal coupling behaviour. In this context, the Purcell effect [1] constitutes an important mechanism allowing to greatly enhance fluorescence rate of emitters when coupled to electromagnetic cavity modes. However, highly resonant structures such as dielectric cavities are inherently bandwidth limited, strongly restricting their use to one specific transition or optical state. Meanwhile, metallic structures can provide extremely high enhancement factors over a wide frequency range due to small modal volumes provided by plasmonic sub-wavelength confinement, even off-resonance. One important feature, which has remained elusive in this context, is the efficient coupling and guided extraction of enhanced quantum emission on and from the nanoscale. |
Wednesday, March 16, 2022 1:06PM - 1:18PM |
N26.00009: A nano gap can be much brighter when blocked Ji-Hun Kang, Dukhyung Lee, Seojoo Lee, Dai-Sik Kim, Q-Han Park We theoretically and experimentally demonstrate that, for a one-dimensional nano gap perforated in a thin (i.e., sub-wavelength-thick) metal plate, blocking the gap with a conducting layer can lead to a boost in light transmission through the gap, meaning that the gap can be much brighter than an unblocked one. This counter-intuitive phenomenon is shown to stem from the strongly modified cavity resonance condition of the fundamental gap mode reflecting at two gap ends. Our theory predicts that the blocking layer induces an anomalous phase shift to the gap mode reflection at the blocked end, giving rise to the emergence of the cavity resonance in a deep sub-wavelength thickness and boosted light transmission. From this, we reveal a non-intuitive consequence that a complete perforation of a gap does not always yield the brightest: the brightest one can appear when partially perforated with residual metal. This prediction is verified by optical spectroscopy with a gold sample. |
Wednesday, March 16, 2022 1:18PM - 1:30PM |
N26.00010: Influence of Indium Nanoparticle Array Distributions on Deep-Ultraviolet Surface Plasmon Resonances Hongling Lu, Ethan Lu, Julia Trombley, Rachel S Goldman Noble metal nanoparticles (NPs) are often utilized as plasmonic materials, but their support of localized surface plasmon resonances (LSPRs) is limited to the visible to infrared regimes. In contrast, non-noble metal NPs are cheaper to synthesize and exhibit LSPRs extending from the IR to the UV spectral regions. Indium is of particular interest due to its potential as a low-loss, high-gain material with LSPRs tunable to the deep-UV range. To date, the plasmonic properties of In NPs with average NP diameter less than 20 nm have yet to be reported. Here, we present a computational-experimental approach to examine the influence of In nanoparticle (NP) array distributions on DUV surface plasmon resonances (SPR). Spectroscopic ellipsometry reveals that In NP arrays have negligible influence on Si absorptance for energies up to 6.4 eV. For energies beyond 6.4 eV, NP size distributions extracted from atomic-force micrographs are used as input into finite-difference time-domain (FDTD) simulations which predict absorptance enhancement with maxima at 7.95 ± 0.1 eV due to SPRs. SPR energy increases as the average NP diameter increases up to 12.5 nm but subsequently decreases beyond 12.5 nm, which can be attributed to intrinsic and extrinsic size-effects, respectively. |
Wednesday, March 16, 2022 1:30PM - 1:42PM |
N26.00011: Enhanced mid-infrared absorption by coupled surface plasmon-phonon polariton resonances in Fabry-Perot nanocavity array MyoungHwan Kim, SATYANARAYANA R KACHIRAJU, Ivan Nekrashevich, Imtiaz Ahmad, Hira Farooq, Long Chang, Sangsik Kim Resonant optical cavity is an essential component to enhance a coupling of light and the sub-wavelength scale resonator. We experimentally demonstrate subwavelength-scale resonant nanocavity arrays which have highly enhanced absorption spectrum in the mid-infrared via coupled surface plasmon-phonon polariton resonances. The metal-insulator-polar dielectric structure supports a guided mode in the lateral direction while vertically confining the mid-infrared wave (10 – 12 micro-meter wavelength) within an 80 nm thick dielectric spacer. The metal (Au)-insulator (Si) aperture array on polar dielectric (SiC) crystal form Fabry-Perot cavity array. The resonance appears at half-wave Fabry-Perot resonance condition of the coupled surface plasmon-phonon polariton mode. Our cavity arrays exhibit broadband, angle-insensitive, and frequency-tunable absorption up to 80% of the optical power and should benefit polariton-based mid-infrared applications. This work was performed, in part, at the Center for Integrated Nanotechnologies, an office of Science User Facility operated for the U. S. Department of Energy (DOE), Office of Science by Los Alamos National Laboratory (Contract 89233218CNA000001) and Sandia National Laboratories (Contract DE-NA-0003525). |
Wednesday, March 16, 2022 1:42PM - 1:54PM |
N26.00012: Transient spectroscopic studies on the co-dependence of hot-carrier dynamics and active optical response of a 1D plasmonic crystal Andrew S Kim, Mohammad Taghinejad, Kyutae Lee, Wenshan Cai Ultrafast nonlinear optical properties of plasmonic systems highly depend on the dynamics of hot carriers, defined as high energy electrons and holes generated upon the nonradiative decay of plasmon resonances. From a microscopic view, the third-order Kerr-type nonlinearity of an optically excited plasmonic metal follows the characteristic timescales of the formation and relaxation of hot carriers, until the electron-phonon scattering brings excited electrons to an equilibrium condition with the metal lattice. Understanding these characteristic timescales is thus pivotal for efficient design of active plasmonic platforms. Here, we present a comprehensive picture that reveals the interplay of hot-carrier transient dynamics and the optical response of a 1D plasmonic crystal. The sensitivity of lattice resonance modes to the in-plane momentum of impinging light allows the spectral tuning of the resonance wavelength. Therefore, exploring the co-dependence of hot-carrier relaxation dynamics and active linear and nonlinear resonance properties of the devised plasmonic crystal can be explored over a wide spectral range. As prospective applications, we demonstrate the ultrafast control of resonance band separation and coherent control of light attributes through hot-carrier dynamics. |
Wednesday, March 16, 2022 1:54PM - 2:06PM |
N26.00013: Electrically-tunable active metasurfaces and metadevices based on phase transition of vanadium dioxide Ruwen Peng, Fang-Zhou Shu, Jia-Nan Wang, Bo Xiong, Yu Liu, Ben-Qi Hou, Ren-Hao Fan, Dong-Xiang Qi, Mu Wang In recent years, dynamically tunable nanophotonic materials and devices have drawn intense attention with great promise for practical applications. In this work, we present several electrically-tunable active metasurfaces and metadevices based on the phase transition of VO2, which include electrically tunable broadband infrared waveplates with dynamic metasurfaces, continuously and reversibly electro-tunable optical nanoantennas, and electrically-tuned flexible active absorbers. First, we experimentally demonstrate the electrically-tunable broadband infrared waveplates by combining phase-change material (VO2) and dispersion-free metasurface. The polarization states are modulated through the electrically-induced phase transition of vanadium dioxide, where the output polarization state can be continuously tuned from horizontal polarization to vertical polarization, or from circular polarization to linear polarization. In the second, we experimentally demonstrate a continuously and reversibly electro-tunable optical nanoantenna, by integrating an asymmetric gold nanodisk dimer array with a vanadium dioxide film. Thirdly, we have demonstrated a metal-flexible PCM(VO2)-metal infrared meta-absorber with mechanical flexibility and electrical tunability. The investigations here can be applied in dynamic digital displays, optical data storage, imaging sensors, and active wearable devices. |
Wednesday, March 16, 2022 2:06PM - 2:18PM |
N26.00014: Doubly resonant nanocavities for molecular frequency upconversion at the single-photon level Philippe Roelli, Christophe Galland, Wen Chen, Tobias J Kippenberg, Huatian Hu, Zsuzsanna Koczor-Benda As applications in fields like security or medicine require sensitive schemes in order to detect IR photons, an interesting strategy consists in converting weak IR signals into the optical domain. In the conversion process suggested here, an incoming IR field drives resonantly a molecular vibration and modifies its excited state population, which is mapped onto the scattered Raman signal produced during the interaction between the same vibrational mode and an optical pump beam. The modified vibrational population gives rise to an additional emission of coherent optical photons on the Raman sidebands that can be detected with existing single photon counting techniques. To insure an optimal overlap between the two beams and the molecular system, doubly resonant nanocavities confine the fields into similar mode volumes and increase the efficiency of the conversion process. |
Wednesday, March 16, 2022 2:18PM - 2:30PM |
N26.00015: Coupling between Split-Ring Resonators and Antiferromagnetic Magnons Rolando Valdes Aguilar, Daniel M Heligman We report on the results of simulations of the terahertz response of a split ring resonator (SRR) metamaterial coupled to a hypothetical antiferromagnetic material characterized by a magnon resonance. The simulations were done using finite difference time domain (FDTD) techniques. By adjusting the magnon frequency we find a hybridization of the resonant normal modes of the SRR and the magnon manifested as an avoided crossing. By varying the physical separation between the metamaterial and the antiferromagnet with a dielectric spacer, we evaluated the coupling strength between the two. |
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