Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session L62: Topological and Non-Hermitian PhotonicsInvited
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Sponsoring Units: DAMOP Chair: Wladimir Benalcazar, Pennsylvania State University Room: BCEC 258C |
Wednesday, March 6, 2019 11:15AM - 11:51AM |
L62.00001: Topological Photonics Invited Speaker: Marin Soljacic TBD |
Wednesday, March 6, 2019 11:51AM - 12:27PM |
L62.00002: Nontrivial topology from simple photonic structures Invited Speaker: Shanhui Fan Within the emerging area of topological photonics, which seeks to discover novel topological physics effects in photonic systems, much of the efforts have been devoted to discover non-trivial topology in photonic band structures. On the other hand, there are also interesting topological effects in other aspects of photonics. In this talk, as one of the examples, we discuss the non-trivial topology that arises from the dependency of the scattering matrix of a photonic crystal slab on the angles of incidence. We show that these scattering matrices can exhibit non-trivial topology, which leads to complete polarization conversion, as well as the capability for generation of arbitrary polarization by varying only the input angles. Being topological, these effects are robust to frequency variation, and thus is naturally broad-band. |
Wednesday, March 6, 2019 12:27PM - 1:03PM |
L62.00003: Exceptional points, coherent perfect absorption and disorder scattering in non-Hermitian media Invited Speaker: Stefan Rotter In my talk I will discuss the physics of exceptional points (EPs) and how encircling them creates a robust and asymmetric switch between the two resonant modes that meet at such an EP. In particular, I will focus on the topological aspects of this state transfer protocol that has meanwhile been implemented in a number of different experimental setups [1-3]. I will then point out that EPs can not only be obtained by merging two resonant states, but also by the coalescence of two S-matrix zeros giving rise to a perfect chiral absorber [4]. By studying the movement of such perfectly absorbing S-matrix zeros in a disordered system, we recently achieved the first experimental demonstration of a "random anti-laser" - a disordered system that perfectly absorbs a suitably shaped incoming wave state [5]. If time permits, I will also report on scattering states in disordered media with constant intensity and perfect transmission [6]. Implementing these states using several loudspeakers with gain and loss allows us to steer an incoming sound wave across a strongly disordered waveguide without any reflection or variation in its pressure [7]. |
Wednesday, March 6, 2019 1:03PM - 1:39PM |
L62.00004: Topological photonics in open systems Invited Speaker: Bo Zhen Topological order has raised great research interests in optical systems over the past years, while most of the efforts have been focused on closed and lossless (Hermitian) systems. Here, I will present some of the recent progresses in studying topological states in optical systems with open boundary conditions. On the one hand, radiation losses in these non-Hermitian systems give rise to new topological states that are not possible in Hermitian ones. On the other hand, the concept of topological invariants gives us new means to control the radiation fields, both in their amplitudes and polarization states. |
Wednesday, March 6, 2019 1:39PM - 2:15PM |
L62.00005: Photonic Topological Insulators in Synthetic Dimensions Invited Speaker: Mordechai Segev Topological phases enable protected transport along the edges of materials, offering immunity against scattering from disorder and imperfections. These phases were suggested and demonstrated not only for electronic systems, but also for electromagnetic waves, cold atoms, acoustics, and even mechanics. Traditionally, the underlying model of these systems is a spatial lattice in two or three dimensions. However, it recently became clear that many lattice systems can exist also in synthetic dimensions which are not spatial but extend over a different degree of freedom. Thus far, topological insulators in synthetic dimensions were demonstrated only in cold atoms, where synthetic dimensions have now become a useful tool for demonstrating a variety of lattice models that are not available in spatial lattices. Recently, efforts have been directed towards realizing topological lattices with synthetic dimensions in photonics, where they are connected to physical phenomena in high-dimensions, interacting photons, and more. We will describe our recent results demonstrating experimentally the first photonic topological insulator in synthetic dimensions. The ability to study experimentally photonic systems in synthetic dimensions opens the door for a plethora of unexplored physical phenomena ranging from PT-symmetry, exceptional points and unidirectional invisibility to Anderson localization in high dimensions and high-dimensional lattice solitons, topological insulator lasers in synthetic dimensions and more. Our study here paves the way to these exciting phenomena, which are extremely hard (if not impossible) to observe in other physical systems. |
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