Bulletin of the American Physical Society
2020 Annual Meeting of the APS Four Corners Section (Virtual)
Volume 65, Number 16
Friday–Saturday, October 23–24, 2020; Albuquerque, NM (Virtual)
Session J04: Condensed Matter Physics IIILive
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Chair: Andrei Piryatinski, LANL |
Saturday, October 24, 2020 8:00AM - 8:24AM Live |
J04.00001: Engineering non-equilibrium light-emitting states in plasmonic nanocavities via interplay of coherent and dissipative interactions Invited Speaker: Andrei Piryatinski In quantum plasmonics, highly polarizable metal nanostructures supporting surface plasmon modes provide a source of strong enhancement in the photon local density of states. This has an effect similar to that of low-Q optical microcavities. Technological flexibility in design and fabrication of plasmonic cavities sets the stage for their applications as light emitting devices ranging from quantum-single-photon through coherent multi-photon sources. Provided strong coupling between the surface plasmons and quantum emitters (e.g., fluorescent dyes or semiconductor nanostructures) a low threshed coherent light emission can occur at room temperature from a state such Bose-Einstein condensate of exciton-plasmon-polaritons. Taking advantage of direct coherent and environment mediated dissipative interactions between the surface plasmons and quantum emitters, a reach phase diagram of non-equilibrium light-emitting states can be recovered. Using a driven-dissipative plasmonic Dicke model, we explore the non-equilibrium phase diagram with respect to these interactions. The analysis shows that the non-equilibrium superradiant and regular lasing states can be recovered in the dissipative coupling regime and a new anomalous lasing phase appears. Calculated photon emission spectra are demonstrated to carry distinct signatures of these phases. Furthermore, we employ numerical modelling of surface-plasmon response and plasmon interactions with semiconductor quantum dots in a metal nano-antenna and plasmonic lattices to demonstrate experimental feasibility of anomalous and regular lasing regimes. [Preview Abstract] |
Saturday, October 24, 2020 8:24AM - 8:36AM Live |
J04.00002: Mode coupling, Fano resonances, and Rabi splitting in hybrid nanostructure Dominic Bosomtwi, Marek Osinski, Viktoriia Babicheva A metasurface is a thin, two-dimensional artificial array of optical nanostructures with subwavelength lateral dimensions. Metasurfaces have generated tremendous attention in recent years due to their planar configuration, lightweight, design simplicity, straightforward fabrication procedure, ease of integration into photonic devices, and ability to control electromagnetic waves. Because of these advantages, metasurfaces have been considered as promising candidates for numerous practical applications, such as sensing, beam steering, lenses, imaging, and solar energy harvesting. Here, we numerically study the scattering response of a periodic paired array of multilayer silver-silicon nanopillar metasurfaces using full-wave simulation. We design a hybrid silver-silicon multilayer array metasurface and realize Fano resonances and Rabi splitting in the spectral response of the nanostructures. We study the interaction between bright and dark modes excited in the unit cell of the nanostructure. It gives rise to asymmetric spectral profile in the absorption or reflection spectra, resulting in the excitation of Fano resonance. The coupling between two Fano resonance states in the nanostructure results in the observation of Rabi splitting. [Preview Abstract] |
Saturday, October 24, 2020 8:36AM - 8:48AM Live |
J04.00003: Application of Differential Geometry on Extraordinary Magnetoresistance ZHENZHONG XING, Leo Rodriguez, Shanshan Rodriguez, Sathwik Bharadwaj, L. Ramdas Ram-Mohan Traditionally, the extraordinary magnetoresistance (EMR) is conducted on a circular symmetric device where a circular conductor embeds at the center of a semiconductor wafer with magnetic field on the direction of central axis, and researchers have been trying to optimize EMR with different geometry and dynamic magnetic field. It was shown that the duality between EMR and gravity theory can be used to construct a four dimensional action and compute the general field equations which provides a novel way to investigate the EMR shape optimization of different geometries and magnetic field configurations. From the general action, the specific field equations are derived in this paper for both ordinary and spherically symmetric EMR devices when tangential and perpendicular magnetic fields are applied respectively. [Preview Abstract] |
Saturday, October 24, 2020 8:48AM - 9:00AM Live |
J04.00004: High refractive index metasurfaces for programmable laser emission Vahid Karimi, Viktoriia Babicheva Metasurfaces of high-refractive-index materials, such as silicon or III-V compounds of gallium arsenide and similar materials, can fulfill control of light at the subwavelength scale facilitated by the excitation of Mie resonances [1]. The metasurfaces with Mie resonances have a high potential in being utilized for control of coherent light states. The integration of high-index metasurfaces and light-emitting devices, such as VCSELs and VeCSELs, has been shown as a viable technique to engineer arbitrary beam-shaping design with programmable controllability and lasering profiles. We perform numerical simulations of III-V compound metasurfaces, and we analyze the reflection, transmission, and absorption profiles of the nanostructure consisting of III-V compounds. We study different thicknesses of the intermediate layer and arrays of various periodicity, as well as nanopillar heights and radii. The metasurface's prominent scattering features originate from nanopillar Mie resonances upon illumination from either substrate or superstrate side. We demonstrate that adding the high-index intermediate layer can shift desired resonances along the spectrum. [1] V. Karimi, V. E. Babicheva, Proc. SPIE 11460, Metamaterials, Metadevices, and Metasystems 2020, 114601F (2020). [Preview Abstract] |
Saturday, October 24, 2020 9:00AM - 9:12AM Live |
J04.00005: Role of Atomic and Electronic Structure of LiTaO$_{\mathrm{3\thinspace }}$and LiNbO$_{\mathrm{3}}$ Piezoelectric for Direct NanoBonding™ with Si And SiO$_{\mathrm{2}}$:~ Comparison of Measured Surface Energies with Computed $\Delta $G and Infra-Red Absorption Mohammed Sahal, Abbie Elison, Shefali Prakash, Srivatsan Swaminathan, Riley Rane, Brian Baker, Jacob Kintz, Aliya Yano, Saaketh Narayan, Alex Brimhall, Lauren Puglisi, Robert Culbertson, Nicole Herbots Piezoelectric LiTaO$_{\mathrm{3\thinspace }}$/LiNbO$_{\mathrm{3}}$/Si hetero-structures have two major issues: mismatch of crystal structure, lattice constants and especially coefficient of thermal expansion, by an order of magnitude.~Hence, this work uses NanoBonding$^{\mathrm{TM\thinspace }}$[1] to directly bond LiTaO$_{\mathrm{3}}$ to Si and LiNbO$_{\mathrm{3}}$ to SiO$_{\mathrm{2\thinspace }}$via Surface Energy Engineering (SEE). SEE modifies in synergy surface hydro-affinity (H-A) and Surface Energy (SE) to far-from-equilibrium states likely to react in air at RT. HA and SE are measured via Three Liquid Contact Angle Analysis in air. SEs are 41 \textpm 2 mJ/m$^{\mathrm{2\thinspace }}$for LiTaO$_{\mathrm{3}}$ and 39 \textpm 2.5 mJ/m$^{\mathrm{2}}$ for LiNbO$_{\mathrm{3}}$, thus close. SE is compared to computed $\Delta $Gs of interaction for LiTaO$_{\mathrm{3}}$, -104 mJ/m$^{\mathrm{2}}$, and LiNbO$_{\mathrm{3}}$, -115 mJ/m$^{\mathrm{2}}$, in 25{\%} H$_{\mathrm{R}}$. Thus, $\Delta $Gs favor water adsorption with negative values, -104 mJ/m$^{\mathrm{2}}$ and -115 mJ/m$^{\mathrm{2\thinspace }}$respectively.~Negative $\Delta $G can favor spontaneous bonding of LiTaO$_{\mathrm{3}}$ to Si and hydrophobic LiNbO$_{\mathrm{3}}$ to hydrophilic SiO$_{\mathrm{2}}$. Experimentally, SEE is needed to activate bonding of LiTaO$_{\mathrm{3}}$ to Si, and LiNbO$_{\mathrm{3}}$ to SiO$_{\mathrm{2}}$. [1] Herbots, et al. U.S. Pat. {\#} 9,018,077 (2015), 9,589,801(2017), pend. (2020) [Preview Abstract] |
Saturday, October 24, 2020 9:12AM - 9:24AM |
J04.00006: Magnetic Behavior of Multilayered [Co/Pt] Thin Films Aaron Gentillon, Karine Chesnel Understanding the formation of magnetic domain patterns in ferromagnetic thin films and their evolution under a magnetic field is useful for application in nanotechnologies such as magnetic storage. We are specifically studying domains patterns in multilayered [Co/Pt]\textunderscore N thin films with perpendicular magnetic anisotropy (PMA). We are imaging the domain patterns via Atomic and Magnetic Force Microscopy (AFM/MFM) at remanence as well as in the presence of a magnetic field applied in-situ. The films consist of 3 nm thick Co layers and 0.7 nm thick Pt layers, with a number of repeats N, varying from 6 to 20. We are investigating how the number of layers N affects the domain size and therefore the domain density but also the degree of PMA exhibited by the films. We will show images of magnetic domain patterns collected at remanence as well as over a range of field values from about 0.10 T to 0.60 T. The data shows the evolution of the magnetic domain morphology from a maze-like state at remanence and low field values, toward a bubble state at higher field values. The bubble-like domains then disappear as the sample reaches saturation, occurring at about 1 T. When the field is released, the magnetic pattern may remain in a bubble state. This study provides with a unique view of how the thin films react to external magnetic fields and how to optimize domain density . [Preview Abstract] |
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