Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M03: Chiral Molecules and Chiral LightLive
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Chair: Jean Marcel Ngoko Djiokap, University of Nebraska - Lincoln |
Wednesday, June 2, 2021 2:00PM - 2:12PM Live |
M03.00001: Structuring light's chirality, enantio-sensitive light bending, and the chiral double slit experiment Andres F Ordonez Lasso, David Ayuso, Piero Decleva, Misha Ivanov, Olga Smirnova Structured light, which exhibits nontrivial intensity, phase, and polarization patterns in space, has key applications ranging from imaging and 3D micromanipulation to classical and quantum communication [J. Opt. 19, 013001]. However, to date, its application to molecular chirality [J. Phys. Chem. A, 118, 3472] has been limited by the weakness of magnetic interactions. Here we show how to lift this limitation by structuring light's local chirality – a new type of chirality effective within the electric-dipole approximation [Nat. Phot. 13, 866]. We introduce and realize an enantio-sensitive interferometer for efficient chiral recognition without magnetic interactions, which can be seen as a chiral version of Young's double slit experiment. We show that if the distribution of light's handedness breaks left-right symmetry, the interference of chiral and achiral parts of the molecular response leads to unidirectional bending of the emitted light, in opposite directions in media of opposite handedness. Our work introduces the concepts of polarization of chirality and chirality-polarized light, exposes the immense potential of sculpting light's local chirality to control the molecular response, and offers novel opportunities for efficient chiral discrimination, optical molecular fingerprinting, and imaging on ultrafast time scales using intense light. |
Wednesday, June 2, 2021 2:12PM - 2:24PM Live |
M03.00002: Tracking the bond stretching of chiral molecules using photoelectron circular dichroism Chi-Hong Isaac Yuen, Esteban Goetz, Julian Suarez, Christiane Koch, Loren Greenman In this talk, we propose a bond-length--sensitive probe of the chiral character of a dissociating chiral molecule prepared by a pump pulse. |
Wednesday, June 2, 2021 2:24PM - 2:36PM Live |
M03.00003: Transitions between Rydberg states in two-color corotating circularly polarized laser pulses Yonas A Gebre Higher-order Raman (Λ, V and S) transitions between Rydberg states of hydrogen atom involving the absorption and emission of at least three photons in the interaction with two-color corotating circularly polarized laser pulses is presented. Our work uses the numerical solution to the corresponding time-dependent Schrdinger equation to model the interaction. The results for the interaction with (ω, 2ω)-fields show that the simultaneous interaction with both fields results in an excited state distribution over a broad range of magnetic quantum numbers. By preparation of the atom in specific Rydberg states, the impact of the Λ-, V-, and S-transitions are found by analysis of the final distribution of the excited states. The same mechanism is also demonstrated for two-color fields with larger difference in central frequencies, i.e. (ω, 3ω)- and (ω, 4ω)-fields. |
Wednesday, June 2, 2021 2:36PM - 2:48PM Live |
M03.00004: The conservation of the spatiotemporal orbital angular momentum of light Chen-Ting Liao, Guan Gui, Nathan Brooks, Henry C Kapteyn, Margaret M Murnane Spatiotemporal orbital angular momentum (ST-OAM) of light processes transverse OAM that is different from conventional OAM of light with longitudinal OAM. A pulsed beam carrying ST-OAM has a localized electromagnetic field vortex that shows spiral phase winding structure in both space and time. In our experiment, we uncovered the conservation of transverse OAM in a second-harmonic generation process, where the spatiotemporal topological charge of the fundamental field is doubled along with the optical frequency. We also observed that the topology of a second-harmonic ST-OAM field could be altered by complex spatiotemporal astigmatism, leading to multiple phase singularities separated in space and time. |
Wednesday, June 2, 2021 2:48PM - 3:00PM Live |
M03.00005: Angle-Resolved Attosecond Streaking of Twisted Attosecond Pulses Gopal Dixit, Irfana Ansari, Deependra Jadoun The present work focuses on investigation of the amount of orbital angular momentum (OAM) encoded in the twisted attosecond pulses via energy- and angle-resolved attosecond streaking in pump-probe setup. It is found that the photoelectron spectra generated by the linearly polarised twisted pulse with different OAM values exhibit angular modulations, whereas circularly polarised twisted pulse yields angular isotropic spectra. It is demonstrated that the energy- and angle-resolved streaking spectra are sensitive to the OAM values of the twisted pulse. Moreover, the different combinations of the polarisation of the twisted pump pulse and strong infrared probe pulse influence the streaking spectra differently. The characterisation of the OAM carrying twisted attosecond pulses opens up the possibility to explore helical light-matter interaction on attosecond timescale. |
Wednesday, June 2, 2021 3:00PM - 3:12PM Live |
M03.00006: Ultrafast optical rotation in chiral molecules David Ayuso, Andres F Ordonez Lasso, Misha Ivanov, Olga Smirnova Sculpting sub-cycle temporal structures of optical waveforms allows one to image and even control electronic clouds in atoms, molecules and solids. In this presentation, I will show how the transverse spin component arising upon spatial confinement of such optical waveforms enables extremely efficient chiral recognition and control of ultrafast chiral dynamics. When an intense few-cycle, linearly polarized laser pulse is tightly focused into a medium of randomly oriented chiral molecules, the medium generates light which is elliptically polarized, with opposite helicities and opposite rotations of the polarization ellipse in media of opposite handedness [Ayuso et al, arXiv:2011.07873]. In contrast to conventional optical activity of chiral media, this new nonlinear optical activity is driven by purely electric-dipole interactions and leads to giant enantio-sensitivity in the near VIS-UV domain, where optical instrumentation is readily available. Adding a polarizer turns the rotation of the polarization ellipse into highly enantio-sensitive intensity of the nonlinear-optical response. Sub-cycle optical control of the incident light wave enables full control over the enantio-sensitive response. The proposed all-optical method not only enables chiral discrimination with extreme enantio-efficiency, but also ultrafast imaging and control of chiral dynamics using commercially available optical technology. |
Wednesday, June 2, 2021 3:12PM - 3:24PM On Demand |
M03.00007: Enantioselective orientation of chiral molecules induced by terahertz pulses with twisted polarization Ilia Tutunnikov, Long Xu, Robert W Field, Keith Nelson, Yehiam Prior, Ilya Averbukh Chirality and chiral molecules are key elements in modern chemical and biochemical industries. Individual addressing and the eventual separation of chiral enantiomers have been and still are important elusive tasks in molecular physics and chemistry, and a variety of methods have been introduced over the years to achieve these goals. Here, we theoretically demonstrate that a pair of cross-polarized THz pulses interacting with chiral molecules through their permanent dipole moments induces in these molecules an enantioselective orientation. This orientation persists for a long time, exceeding the duration of the THz pulses by several orders of magnitude, and its dependency on temperature and pulses' parameters is investigated. This persistent orientation may enhance the deflection of the molecules in inhomogeneous electromagnetic fields, potentially leading to viable separation techniques. |
Wednesday, June 2, 2021 3:24PM - 3:36PM On Demand |
M03.00008: Second harmonic generation and orthogonal orbital angular momentum of spatiotemporal optical vortices Scott Hancock, Sina Zahedpour Anaraki, Howard M Milchberg Spatiotemporal optical vortices (STOVs) are a new type of intrinsic optical orbital angular momentum (OAM) structure in which the OAM vector is orthogonal to the propagation direction [1,2] and the optical phase circulates in space-time. Here, we experimentally and theoretically demonstrate, for the first time, the generation of the second harmonic of a STOV-carrying pulse along with the conservation of STOV-based OAM. Our experiments and calculations [3] verify that photons can have intrinsic orbital angular momentum perpendicular to their propagation direction. |
Wednesday, June 2, 2021 3:36PM - 3:48PM On Demand |
M03.00009: Mode structure and orbital angular momentum of spatiotemporal optical vortex (STOV) pulses Scott Hancock, Sina Zahedpour Anaraki, Howard M Milchberg Spatiotemporal optical vortex (STOVs)-carrying pulses are a recently discovered class of polychromatic optical structures with orbital angular momentum (OAM) orthogonal to the direction of propagation [1-3]. |
Wednesday, June 2, 2021 3:48PM - 4:00PM On Demand |
M03.00010: Trojan Wave Packets in the Circularly Polarized and the Magnetic Fields on the multi-layer Langmuir type $(1)$ Helium trajectories extended for odd number of electron atoms Matt Kalinski We extend the concept of the Langmuir type $(1)$ ``Hoop Earrings" rotating Helium-like model |
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