Bulletin of the American Physical Society
2018 Joint Fall Meeting of the Texas Sections of APS, AAPT and Zone 13 of the SPS
Volume 63, Number 18
Friday–Saturday, October 19–20, 2018; University of Houston, Houston, Texas
Session P03: Optics |
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Chair: Lowell Wood, University of Houston Room: Science and Engineering Classroom (SEC) 203 |
Saturday, October 20, 2018 2:10PM - 2:22PM |
P03.00001: Computational Wide Area Optical Phase Contrast Microscopy Sean M. Guthrie, Ivan Vazquez, Mini Das This work focuses on computational imaging techniques aimed at reducing the cumbersomeness and cost of physical optical components. Here we present our preliminary results from a lens free wide area optical microscope. A wide area on-chip microscopy would allow faster and more efficient microscopy of sparse thin samples without the need to scan the sample. Our setup resembles that used in a Gabor Holographic method. The goal of this project is to investigate the effectiveness of a single-stage algorithm to obtain the phase of an image from intensity measurements alone. The technique will include both single and multiple source-to-sample distances in order to generate data to explore previously-established methodologies. We will adapt some popular methods used in x-ray phase retrieval to test our new device. In addition, we will develop theoretical methods and computational algorithms to suit an array of applications. |
Saturday, October 20, 2018 2:22PM - 2:34PM |
P03.00002: Modulated Bessel beams for non-diffracting circularly symmetric optical lattices Mariia Shutova, Aleksandr Goltsov, Anatoli Morozov, Zack Liege, Alexei V Sokolov We modify Bessel beams generated by an axicon employing binary phase modulation. We design a converter, which consist of a binary phase plate in combination with an axicon, that we use for converting the flat top beam into non-diffracting optical centrosymmetric lattice. Numerical simulations of the converter performance show that the resultant lattice has high peak intensity, which makes it a good option for our goal to overcome plasma generation threshold under the limited laser power condition. To find optimal parameters experimentally, we use the spatial light modulator to simulate the binary phase plate and the low intensity flat top He-Ne laser beam. The binary geometry of the phase plate allows its manufacturing using simple two-level lithography for high energy experiments. In addition, we take into account the effects of ultrashort laser pulse on the converter performance (plasma production and lattice stability) and simulate the time-dependent intensity output with a typical Ti:sapphire femtosecond Fourier transform limited laser pulse as an input.
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Saturday, October 20, 2018 2:34PM - 2:46PM |
P03.00003: Coupling of epsilon-near-zero and plasmonic modes in ALD-AZO coated nanoantenna array Subhajit Bej, Sudip Gurung, Aleksei Anopchenko, Brian Ko, Howard Ho Wai Lee Recently, there has been a revival of the interests in the optical properties of materials near their Epsilon-near-zero (ENZ) (real part of material permittivity crosses zero) regions. By integrating ENZ thin films into plasmonic nanoantenna arrays, hybrid ENZ-plasmonic systems can be formed. Most of the hybrid systems reported so far include ENZ thin film layers as substrates, which restrict the control of the coupling strength. Here, we study the optical response of gold nanoantenna arrays conformally coated with ENZ Al-doped zinc oxide (AZO) thin films. We grow the AZO nano-layers on top of gold nanoantennae by using the atomic layer deposition (ALD) technique. Both the simulated (finite-difference-time-domain) and the measured transmission spectra show resonance splitting due to the coupling between the localized surface plasmon and the Ferrell-Berreman modes. These plasmonic antenna arrays with ENZ AZO conformal coatings can support novel hybrid plasmonic-ENZ modes and may pave a way towards a completely new type of plasmonic devices. |
Saturday, October 20, 2018 2:46PM - 2:58PM |
P03.00004: Emissive properties of quantum emitters coupled to ultra-thin epsilon-near-zero films Aleksei Anopchenko, Subhajit Bej, Norbert Danz, Girish Saran Agarwal, Howard Ho Wai Lee Plasmonic substrates are commonly used for enhancing emissivity of quantum emitters such as atoms, molecules or quantum dots in QED photochemistry and surface-enhanced spectroscopies. Substrates made of novel materials such as hyperbolic metamaterials, 2-dimensional, and epsilon-near-zero (ENZ) materials have emerged recently. Here, we present our study of the emissive properties of classical and quantum emitters placed on the surface of ultra-thin ENZ films which support plasmon polariton modes. Quantum emitters with the emission wavelength matching the ENZ polariton wavelength show enhanced emission rates due to increased local density of optical states. Active control of the emitters coupled to a gated ENZ-insulator-metal heterostructure is discussed. Strong coupling between polariton modes in the heterostructure is observed, which is tunable by an external electric field. Quantum emission switching between polariton branches of the hybrid mode is predicted. |
Saturday, October 20, 2018 2:58PM - 3:10PM |
P03.00005: Atomic layer deposition of aluminum doped zinc-oxide thin films for zero-index optics Sudip Gurung, Subhajit Bej, Garand Tyson, Aleksei Anopchenko, Howard Ho Wai Lee Ultra-thin and ultra-smooth transparent conducting oxide materials with epsilon-near-zero (ENZ) (real part of material permittivity crosses zero) properties are important for zero-index optical applications, for instance, perfect absorption and advanced quantum/nonlinear ENZ applications. In this paper, we demonstrate the use of atomic layer deposition (ALD) technique to fabricate high quality aluminium doped zinc oxide (AZO) nanofilms with precisely controlled thicknesses and desired optical properties in the near-infrared spectral region. The ultra-thin (< 100 nm) and ultra-smooth (RMS roughness ~ 1.5 nm) AZO films are synthesized by ALD using diethylzinc (DEZ), trimethylaluminum (TMA), and water precursors on two different substrates (silicon and fused silica). Spectroscopic ellipsometry is used to characterize the optical and electrical properties of the deposited AZO films. We show that the ENZ frequency and the growth rate of AZO are strongly dependent on the substrate, and they can be precisely tuned by deposition parameters such as dopant ratio and deposition temperature. These ALD grown AZO nano-layers with tunable ENZ frequencies enable the development of ultra-compact and tunable metamaterial devices. |
Saturday, October 20, 2018 3:10PM - 3:22PM |
P03.00006: Epsilon-near-zero Resonance Excitation in AZO nano-coated Optical Fiber Waveguide Jingyi Yang, Aleksei Anopchenko, Sudip Gurung, Khant Minn, Subhajit Bej, Howard Ho Wai Lee We experimentally demonstrate a novel optical waveguide design of side-polished fiber coated with a nano-film of aluminum-doped zinc oxide (AZO). The flat platform of the side-polished fiber is provided by etching/polishing out the cladding of a conventional single mode fiber apart from the doped core. AZO nano-films with epsilon-near-zero (ENZ) wavelength (real part of permittivity of the material crosses zero) at telecommunication wavelengths are fabricated onto the D-shaped platform by atomic layer deposition. Due to the evanescent field coupling between the optical fiber core mode and the modes supported by the AZO nano-layer, a highly confined ENZ mode in the AZO nano-film on the D-shaped platform could be excited. Furthermore, we investigate the polarization-dependent ENZ mode coupling properties with ambient refractive indices. Our results show the first experimental demonstration on the excitation of highly confined ENZ mode on optical fibers. These hybrid ENZ-optical fibers have potential applications for zero-index photonics, for instance, for studying enhanced nonlinear ENZ effects in fiber, quantum emission in ENZ media, and subwavelength mode in-fiber optical- and bio-sensing. |
Saturday, October 20, 2018 3:22PM - 3:34PM |
P03.00007: Optical Nano-antenna on Photonic Crystal Fiber Khant Minn, Blake Birmingham, Brian Ko, Marlan O Scully, Howard Ho Wai Lee, Zhenrong Zhang Metallic nanowire probes supporting plasmon polariton modes can localize the optical fields at nanoscale for near-field imaging and sensing applications such as tip-enhanced Raman spectroscopy (TERS). In this paper, we report the design, fabrication and far-field characterization of a photonic-plasmonic optical fiber probe where light in a photonic crystal fiber (PCF) couples with the surface plasmons of a nanowire optical antenna. The needle-shaped antenna is grown by electron beam assisted chemical deposition of platinum on the PCF’s end facet. By controlling the deposition parameters, height and base diameter of the antenna can be tuned to optimize plasmonic resonance conditions. Far field emission to the side of the probe, optical spectra and mode profiles transmitted through the probe demonstrate the excitation of surface plasmons on the antennae. The probe can be implemented into TERS setup to obtain spectroscopic information at the nanoscale. |
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