Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session S55: Nanostructures and Metamaterials IIFocus Live
|
Hide Abstracts |
Sponsoring Units: DMP Chair: Igal Brener, Sandia National Laboratories |
Thursday, March 18, 2021 11:30AM - 11:42AM Live |
S55.00001: Shaping an enhanced and highly directional thermal emission with localized surface phonon polariton resonances (LSPhPs) Stavroula Foteinopoulou, Ganga Chinna Rao Devarapu Semiconductors can have an infrared permittivity response that is reminiscent of noble-metal plasmonic responses to visible light. This occurs for a specific spectral window within a regime known as the reststrahlen band, where EM waves activate out-of-phase phonon vibrations in the material. Microscale objects made of such reststrahlen-band material support then highly localized resonances similar to localized surface plasmons (LSPs) around plasmonic nanoparticles. By analogy, these resonances are called localized surface phonon polariton resonances (LSPhPs). We show here how to utilize individual LSPhP resonances in a judiciously designed structure to achieve a highly forward thermal emission enhanced by an order of magnitude with respect to the bulk homogenous material. This study can be important for thermal photovoltaics, efficient THz sources, and passive radiative cooling devices. |
Thursday, March 18, 2021 11:42AM - 11:54AM Live |
S55.00002: Controlling the scattering of light with magnetic textures Ioan-Augustin Chioar, Christina Vantaraki, Merlin Pohlit, Richard M. Rowan-Robinson, Björgvin Hjörvarsson, Evangelos Th. Papaioannou, Vassilios Kapaklis We explored the use of a magnetic film of Y3Fe5O12 for steering light with mesoscale magnetic textures. Combining Kerr microscopy with magneto-optical diffractometry, we have investigated the link between the magnetic domain structure of an otherwise unpatterned magnetic film and the resulting scattering pattern of the transmitted light. |
Thursday, March 18, 2021 11:54AM - 12:06PM Live |
S55.00003: Consistent Multiphysics analysis of direct-bandgap semiconductor structures. Andrey Semichaevsky Subwavelength optics [1] is a relatively new technology that enables SERS, extraordinary transmission through aperture arrays, and near-field lenses. One of the challenges in understanding how light interacts with doped semiconductor subwavelength structures is the interaction between the light incident on a structured surface and the free charge carriers in its constituent materials. This work presents a Multiphysics method for the analysis of III-V semiconductor-based structured surfaces. which includes an electromagnetics model, a semiclassical carrier transport model (e.g., BTE), and a Kane Hamiltonian-based electronic structure model. The purpose of the Multiphysics model is the consistent account of local effective material properties that depend on free carrier densities. As an example, electromagnetic fields in subwavelength cavities in InAs:Si are simulated over a mid-IR wavelength range. The proposed analysis is useful for a variety of structured surfaces, including plasmonic waveguides and resonant structures. |
Thursday, March 18, 2021 12:06PM - 12:42PM Live |
S55.00004: Flying Micro-Lightsails: Optical Levitation and Propulsion of Nanostructured Ultralight Macroscopic Objects Invited Speaker: Harry Atwater The Breakthrough Starshot Initiative initiated in 2016 defined an audacious goal of sending a spacecraft beyond to a neighboring star, Proxima Centauri within the next half-century. Its vision for an ultralight spacecraft that can be accelerated by laser radiation pressure from an Earth-based source to ~20% of the speed of light demands the use of materials with extreme properties. Here we examine stringent criteria for the lightsail materials design, thermal management and dynamical stability, and discuss lightsail design and first experimental steps by exploration of small (<1 mm ) microscale lightsails. We explore nanophotonic design of materials, thermal management, and self-stabilizing optical manipulation, levitation and propulsion of lightweight macroscopic (i.e., mm, cm, or even meter-scale) micro-lightsails via radiation pressure. We consider the materials characteristics required to realize robust, thermally stable building blocks, and find that stable trajectories for dynamic motion of macro-objects can be achieved by controlling the anisotropy of light scattering along the object surface. With radiative cooling being the sole mechanism for passive thermal management in vacuum or space, we quantify the stringent requirements on material absorptivity that enable these structures to withstand high laser intensities and prevent excessive heating and mechanical failure. Achievement of stable optical manipulation and propulsion of macroscale (i.e., >> wavelength in size) structures, via radiation pressure appears to be possible by the use of structured optical beams and tailored nanophotonic design. Reaching this goal requires the conception and design of new ultralight photonic structures composed of materials with extreme optical, mechanical and thermal properties. |
Thursday, March 18, 2021 12:42PM - 12:54PM Live |
S55.00005: High-temperature silicon thermal diode and switch Maciej Kasprzak, Marianna Sledzinska, Karol Zaleski, Igor Iatsunskyi, Francesc Alzina, Sebastian Volz, Clivia Sotomayor Torres, Bartlomiej Graczykowski A thermal rectifier/diode is a nonreciprocal element or system that enables preferential heat transport in one direction. In this work we demonstrate a single-material thermal diode operating at high temperatures. The diode is made of nanostructured silicon membranes exhibiting spatially and temperature-dependent thermal conductivity and, therefore, falling into the category of spatially asymmetric, nonlinear nonreciprocal systems. We used an all-optical state-of-the-art experimental technique to prove rectification along rigorous criteria of the phenomenon. Using sub-milliwatt power we achieve rectification of about 14%. In addition, we demonstrate air-triggered thermal switching and passive cooling. Our findings provide a CMOS-compatible platform for heat rectification and applications in energy harvesting, thermal insulation and cooling, as well as sensing and potentially thermal logic. |
Thursday, March 18, 2021 12:54PM - 1:06PM Live |
S55.00006: Imaging the Motion of a Graphene Nanomechanical Resonator Network Brittany E Carter, Viva Rose Horowitz, David Miller, Andrew D Blaikie, Benjamin J Aleman Programmable networks of nanomechanical resonators offer a potential platform to construct phononic crystals and metamaterials, to simulate quantum phenomena, and to realize neuromorphic computing schemes. A key step in achieving programmability is to measure the coupling between resonators in the network. Typically, the coupling is calculated from spectra of resonant modes, which works well for a single pair of coupled resonators. However, as these networks are made larger in size, matching a given spectral mode splitting to an individual coupled pair in the network becomes increasingly challenging. Here we develop a means to identify which resonators are coupled by imaging the network’s amplitude and phase for each spectral peak with scanning interferometric microscopy (SIM). Together with a simple mechanical model, these images spatially resolve the coupling and energy distribution in the network. Using our technique, we image a network of graphene nanomechanical resonators and identify an isolated region of two strongly coupled resonators and a third weakly coupled resonator. As a tool for future programmable nanomechanical networks, our SIM approach could be used to tune resonators, to illuminate vibrational energy leaks, and to image energy flow in patterned waveguides. |
Thursday, March 18, 2021 1:06PM - 1:18PM Live |
S55.00007: Stoichiometry of the Core Determines the Electronic Structure of Environmentally Friendly Core-Shell III–V/II-VI Nanoparticles Mariami Rusishvili, Stefan Wippermann, Dmitri Talapin, Giulia Galli Recently III-V quantum dots (QDs) emerged as an environmentally friendly alternative to CdSe, however, they exhibit broader emission spectra and inferior photoluminescence quantum yield. Here we present a computational study of the opto-electronic properties of InxPz and InxGayPz QDs interfaced with zinc chalcogenide shells[1]. Using density functional theory, we show that fine-tuning the composition of the core is critical to achieving narrow emission lines. We show that core-shell nanoparticles where the core has the same diameter but different stoichiometries may absorb and emit at different wavelengths, leading to broad absorption and emission spectra. The value of the fundamental gap of the core-shell particles depends on the ratio between the number of group III and P atoms in the core and is maximized for 1:1 composition. We also show that the interplay between quantum confinement and strain determines the difference in the electronic properties of III-V QDs interfaced with ZnS or ZnSe shells. |
Thursday, March 18, 2021 1:18PM - 1:30PM Live |
S55.00008: Simultaneous Generation of Arbitrary Assembly of Polarization States for On-Chip Quantum Information Technology Yajun Gao, Ruwen Peng, Mu Wang Manipulating the polarization of light with metasurfaces is essential for integrated photonics and quantum information technology. Here we report on simultaneous generation of different types of polarization states with a single piece of metasurface. By introducing geometrical-scaling-induced phase modulations, we demonstrate that both circularly polarized and linearly polarized states can be simultaneously generated by a metasurface made of L-shaped resonators with different geometrical features. Upon illumination, each resonator diffracts the CP state with a certain GSI phase. The interaction of these diffractions leads to the desired output beams, where the polarization state and the propagation direction can be accurately tuned by selecting the geometrical shape, size, and resonator sequence in the unit cell. We also demonstrate that an image can be encoded with different polarization profiles at different diffraction orders and decoded with a polarization analyzer. This approach resolves a challenging issue in integrated optics and on-chip quantum information processing. |
Thursday, March 18, 2021 1:30PM - 2:06PM Live |
S55.00009: Large Scale Optical Metamaterials for Energy and Sustainability Invited Speaker: Xiaobo Yin Micro/nano-structured metamaterials offer significantly new opportunities for high efficiency devices and systems for energy harvesting, conversion and storage. There is, however, a tremendous gap between the proof-of-principle demonstrations at small scale and the intrinsically large scale real-world energy systems and sustainable applications. In this talk, I will give an overview of our research and, more specifically, present our recent development on how judiciously structured photonic materials address the challenge of the tremendous power hungry for space cooling and promote photosynthesis and crop yield in greenhouses. |
Thursday, March 18, 2021 2:06PM - 2:18PM Live |
S55.00010: Broadband, Non-resonant Platform for Electric field Enhancement Ganapathi Subramania, Stavroula Foteinopoulou Electric field enhancement over nanoscale volumes can typically be achieved by exploiting resonant phenomena such as structural surface plasmons in metals. Electric field enhancement is a key component in manipulating electromagnetic behavior impacting several phenomena such as sensing, light emission and non-linearity. However, their operational bandwidth is limited by the resonance bandwidth which is typically small. Broadband electric field enhancement over a large wavelength range (~ 2-10 μm) in the mid-infrared (Phys. Rev. Lett. 107, 163902(2011)) is possible using a double-grooved metallic structure as it operates non-resonantly. We will describe recent developments in the fabrication and optical response of broadband electric field enhancement structure. |
Thursday, March 18, 2021 2:18PM - 2:30PM On Demand |
S55.00011: Highly Stable Perovskite Supercrystals via Oil-in-Oil Templating Yingying Tang, Peter Schall Inorganic perovskites display an enticing foreground for their wide range of optoelectronic applications. Their beneficial optical properties, such as high photoluminescence quantum yield lend them excellent functionality and tunability, while their cubic shape makes them ideally suited for assembly of dense superstructures. Recently, highly ordered supercrystals (SCs) of inorganic perovskite nanocrystals (NCs) have been reported to possess novel collective optical properties, opening new opportunities for efficient devices. Here, we report the large-scale assembly control of spherical, cubic, and hexagonal SCs of inorganic perovskite NCs through templating by oil-in-oil emulsions. We show that an interplay between the roundness of the cubic NCs and the tension of the confining droplet surface sets the superstructure morphology, and we exploit this interplay to design dense hyperlattices of SCs. Remarkably, the SCs films show strongly enhanced stability for at least two months without obvious structural degradation and minor optical changes. Our results on the controlled large-scale assembly of perovskite NC superstructures provide new prospects for bottom-up production of optoelectronic devices based on the microfluidic production of mesoscopic building blocks. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700