Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F17: Spectroscopy in Space and Time III; Super-resolution and Advanced ImagingFocus
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Sponsoring Units: DCP Chair: David Osborn, Sandia National Laboratories Room: Room 209 |
Tuesday, March 7, 2023 8:00AM - 8:36AM |
F17.00001: Invited Speaker: Haw YangTime-Resolved and Time-Dependent Spectroscopy of Single Nano Objects Moving in Solution Invited Speaker: Haw Yang An interesting challenge in experimental physical chemistry is how to interrogate chemical dynamics in complex environments. Here, a complex environment could be the solid-liquid interface of a functioning fuel cell, the interior of a living mammalian cell, or the juncture between an invading viral particle and a cell membrane, for example. These environments share the same characteristics: that they are anisotropic and highly heterogeneous both in space and in dynamics. Therefore, if quantitative experimental studies could be carried out in them, it would be possible to start addressing the fundamental question: To what extent are the current chemical dynamics concepts applicable in these environments? After all, the current chemical physics paradigm has been established under idealized conditions, isotropic, homogeneous, and primarily resting on a two-body interaction framework. |
Tuesday, March 7, 2023 8:36AM - 8:48AM |
F17.00002: Site-controlled coupling between plasomonic nanostructures and strain-localized excitons in nano-indented WSe2 Nicholas V Proscia, Blake S Simpkins, Samuel W LaGasse, Dante J O'Hara, Hsun-Jen Chuang, Kathleen M McCreary, Igor Vurgaftman, Berend T Jonker, Paul D Cunningham Localized excitons can be deterministically created in 2D transition metal dichalcogenides (TMDs) via strain engineering, which modifies the local band structure and gives rise to site-controlled single photon emission. This has led to recent interest in coupling these emitters to photonic structures to create on-chip-compatible platforms for quantum information and communications. Strong coupling to plasmonic nanostructures is a pathway to coherent control at room temperature. However, prior attempts to couple strain localized excitons in TMDs to plasmonic structures have remained in the weak coupling regime characterized by the Purcell effect. |
Tuesday, March 7, 2023 8:48AM - 9:00AM |
F17.00003: Probing quantum correlations in molecular systems with polarization-entangled photons Ravyn Malatesta Quantum-light can be a powerful tool for the field of molecular spectroscopy. We develop a theoretical framework to treat scattering of quantum photons by open quantum systems and use quantum process tomography to describe the interactions of polarization-entangled biphoton states with molecular systems. Using this theory, we compare what can be learned from single or multiple photon-scattering events of polarization entangled photons with what can be learned about quantum correlations in molecular systems using existing multidimensional electronic spectroscopies. |
Tuesday, March 7, 2023 9:00AM - 9:36AM |
F17.00004: Blinking-Based Multiplexing (BBM): Harnessing Molecular Photophysics for Single-Emitter Classification Invited Speaker: Kristin Wustholz Single-molecule fluorescence approaches have revolutionized biological and materials microscopy. However, many questions can only be addressed by multicolor imaging of multiple targets, a capability that is limited by the small subset of available, well-performing, and spectrally-distinct fluorescent probes. We recently introduced an alternative single-molecule multiplexing approach termed blinking-based multiplexing (BBM), wherein individual molecules are classified on the basis of their intrinsic blinking dynamics. We demonstrate accurate (>93.5%) binary classification of spectrally-overlapped rhodamine and quantum dot emitters using BBM, even when substantial blinking heterogeneity is observed. Classification can be accomplished using change point detection (CPD) analysis of blinking dynamics or a deep learning (DL) algorithm, the latter of which provides up to 96.6% accuracy. Here, we use CPD and DL algorithms to probe the excitation power, environmental, and molecular dependence of BBM. In addition to providing new opportunities in single-molecule spectroscopy and imaging, BBM represents a new take on single-molecule research, where blinking dynamics can be harnessed for more than just traditional localization or nanoreporting. |
Tuesday, March 7, 2023 9:36AM - 9:48AM |
F17.00005: Imaging chiral optoelectronic based on STM-CD Kangkai LIANG, Liya Bi, Shaowei Li, Weike Quan The high performance chiral response of helicene molecule has been previously developed and covered in the visible spectrum. However, there is currently a lack of clear experimental maps that correlate local electronic structures with chiral properties in such structures. Here, we combine scanning tunneling microscope (STM) and circular dichroism (CD) to detect the electronic orbit and optical properties of B, N-Embedded Double Hetero [7] helicines. Our research has provided a strong foundation for understanding the chiral molecular orbital resulting from the selective absorption of light in the helicene molecule. We have developed an appealing method for imaging chiral optical materials in other systems. |
Tuesday, March 7, 2023 9:48AM - 10:24AM |
F17.00006: Widefield infrared photothermal imaging and spectroscopy Invited Speaker: Masaru Kuno Infrared Photothermal Heterodyne Imaging (IR-PHI) is now a well-established, chemical and morphological characterization technique widely applicable to environmental and material science applications. Examples include studying micro- and nanoplastics in spectrally complex, chemical environments[1] as well as monitoring cation migration in hybrid lead halide perovskites. IR-PHI has a spatial resolution of ~300 nm and works in a point-by-point scanning fashion. Time-expensive, single-point data acquisition limits image collection and subsequent material characterization. Here, we introduce a widefield modality to IR-PHI where photothermal IR images are acquired using a high-speed CMOS camera. The approach parallelizes data collection and makes possible hyperspectral imaging of specimens. Widefield image resolution and detection limits are established and compared with those of traditional IR-PHI. |
Tuesday, March 7, 2023 10:24AM - 10:36AM |
F17.00007: Simulations of Optical Measurements of Vibrating Metal Nanoparticle Rachel Gelfand Optical measurements of noble metal nanoparticles have been widely used to elucidate the mechanical properties of nanoparticle vibrations and their surrounding medium. Simulations of these experiments have the ability to further probe the contributing factors of these results. We have developed a central application for simulating both transient absorption and acoustic Raman scattering experiments of noble metal nanoparticles of arbitrary shape, size, composition, and surrounding medium. Developed with COMSOL Multiphysics' finite element solver, this application can be used to predict previously unmeasured sample configurations and interpret the results of previous experiments. We show that our simulations of transient absorption and acoustic Raman scattering measurements accurately produce experimental results for various studied geometries and report simulations of previously unmeasured nanoparticle shapes. |
Tuesday, March 7, 2023 10:36AM - 10:48AM |
F17.00008: Surface Enhanced Raman Spectroscopy in Molecular Junction by Remote Excitation Shusen Liao, Yunxuan Zhu, Jiawei Yang, Keith Sanders, Qian Ye, Alessandro Alabastri, Douglas Natelson Surface enhanced Raman spectroscopy (SERS) is enabled by local surface plasmon resonance (LSPR) in metallic nanostructures. The SERS enhancement factor can be as large as ~1010, which contributes to single molecule detection. When the SERS is excited by direct illumination of the nanostructure, the background heating of lattice and electrons can prevent further manipulation of the molecules. To overcome this flaw, we report SERS in electromigrated gold tunneling junctions through remote excitation: surface plasmon polaritons (SPPs) are excited at nearby gratings and then propagate to the junction and couple to the local nanogap plasmon modes. Like direct excitation of the nanogap, this remote excitation can generate both SERS emission and an open-circuit photovoltage (OCPV) from the junction. We compare the OCPV and SERS intensity in both direct and remote illumination configurations. Coupling efficiency for an ensemble of junctions is statistically analyzed to examine the consistency with propagation loss of SPPs and their coupling to LSPR modes, which we compare with numerical simulations. |
Tuesday, March 7, 2023 10:48AM - 11:00AM |
F17.00009: Gold Ion Beam Milled Gold Zero-Mode Waveguides Troy C Messina, Christopher I Richards, Ivan I Kravchenko, Bernadeta R Srijanto, Charles P Collier Zero-mode waveguides (ZMWs) are widely used in single molecule fluorescence microscopy for their enhancement of emitted light and the ability to study samples at physiological concentrations. ZMWs are typically produced using photo or electron beam lithography. We report a new method of ZMW production using focused ion beam (FIB) milling with gold ions. We demonstrate that ion-milled gold ZMWs with 200 nm apertures exhibit similar plasmon-enhanced fluorescence seen with ZMWs fabricated with traditional techniques such as electron beam lithography. |
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