Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session B10: Advances in Scanned Probe Microscopy 2: High Frequencies and Optical TechniquesFocus
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Sponsoring Units: GIMS Chair: Christopher Lutz, IBM Research – Almaden Room: 108 |
Monday, March 2, 2020 11:15AM - 11:27AM |
B10.00001: Measurement of fluorescent quantum yield using photothermal deflection spectroscopy Stephen Johnson, Brandon T Couch, Andrew Meyer, Brandon Heller Photothermal deflection spectroscopy (PDS) is technique best known for its ability to measure weak optical absorptions various media. In this presentation we demonstrate an extended application for PDS, namely, measurement of the fluorescent quantum yield (Φf) of fluorophores. Starting from first principles of energy conservation, a simple model for the photothermal deflection spectrum as a function of Φf is fit to the spectral data using Φf as a single fitting parameter. Using this method, extracted values of Φf for standard fluorophores such as Rhodamine 6G match closely with literature values. Given that this measurement technique requires no calibration standard, this method could potentially be used as a new standard procedure for determining Φf in fluorescent materials. |
Monday, March 2, 2020 11:27AM - 11:39AM |
B10.00002: Imaging chiral optical excitations through inelastic electron-light scattering Tyler Harvey, Jan-Wilke Henke, Ofer Kfir, Claus Ropers Circular dichroism spectroscopy offers rich insight into biomolecular structure and nanoscale magnetic domain structure, but resolution is limited by the optical wavelength. We demonstrate a nanometer-resolution circular dichroism technique that employs electrons to probe optical near fields. |
Monday, March 2, 2020 11:39AM - 11:51AM |
B10.00003: Visualization of Surface Acoustic Wave by Transmission Mode Microwave Impedance Microscopy Lu Zheng, Linbo Shao, Qicheng Zhang, Alan T Johnson, Marko Loncar, Keji Lai Surface acoustic wave (SAW) devices based on piezoelectric materials play a critical role in modern information technology and the research field of phononic metamaterials and quantum computing. High-resolution real-space mapping of the phononic modes is therefore of fundamental importance for the understanding of propagation, scattering, diffraction, and localization of the acoustic waves. However, it was challenging to image the GHz-range acoustic properties in piezoelectrics directly. Using a transmission-mode microwave impedance microscope (T-MIM), we demonstrate the ability to visualize SAW in multiple systems, including band-pass filter, resonator, and phononic crystals. Our results show that T-MIM can be used to locally probe acousto-electronic behaviors in various platforms with nanoscale spatial resolution. |
Monday, March 2, 2020 11:51AM - 12:03PM |
B10.00004: Experimental and numerical studies of near-field infrared phenomena at nanometer length scales P. McArdle, D. Lahneman, H. Jiang, M. M. Qazilbash, T. Slusar, H.-T. Kim, A. Biswas, F. Keilmann, J. Chen Broadband near-field infrared spectroscopy is fast emerging as a valuable experimental probe of nanomaterials. Light-matter interactions in polaritonic materials at nanometer length scales can be probed effectively with this experimental technique. When there is strong coupling of light to the probe-sample system in highly polar materials such as insulating SrTiO3, the phonon-polariton resonances should be described by detailed numerical simulations. More generally, experimental data needs to be accurately modeled to obtain optical properties at nanometer length scales in non-trivial geometries such as multilayered samples (for example, insulating SrTiO3 crystal with metallic surface), and materials with physical boundaries comparable to the probe apex (for example, nano-platelets of Cu2S). Near-field infrared spectra of materials with anisotropic dielectric function can also be modeled numerically (for example, rutile TiO2). We will present our results on the materials described above, thereby establishing the efficacy of detailed numerical simulations for analyzing experimental spectra. |
Monday, March 2, 2020 12:03PM - 12:39PM |
B10.00005: Time-Resolved Scanning Probe Techniques – Inspecting the Dynamical Properties of Nanoscale Solids in Real Space and Real Time Invited Speaker: Lukas Eng Lukas is a world-renowned investigator in nanometer scale photon-solid interactions. |
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