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Xu XG. Analyzing Three-dimensional Tip Near-field Scattering of Infrared Polaritons through Peak Force Scattering-type Near-field Optical Microscopy. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:640. [PMID: 37613181 DOI: 10.1093/micmic/ozad067.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Xiaoji G Xu
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania, United States
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Mancini A, Gubbin CR, Berté R, Martini F, Politi A, Cortés E, Li Y, De Liberato S, Maier SA. Near-Field Spectroscopy of Cylindrical Phonon-Polariton Antennas. ACS NANO 2020; 14:8508-8517. [PMID: 32530605 DOI: 10.1021/acsnano.0c02784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Surface phonon polaritons (SPhPs) are hybrid light-matter states in which light strongly couples to lattice vibrations inside the Reststrahlen band of polar dielectrics at mid-infrared frequencies. Antennas supporting localized surface phonon polaritons (LSPhPs) easily outperform their plasmonic counterparts operating in the visible or near-infrared in terms of field enhancement and confinement thanks to the inherently slower phonon-phonon scattering processes governing SPhP decay. In particular, LSPhP antennas have attracted considerable interest for thermal management at the nanoscale, where the emission strongly diverts from the usual far-field blackbody radiation due to the presence of evanescent waves at the surface. However, far-field measurements cannot shed light on the behavior of antennas in the near-field region. To overcome this limitation, we employ scattering-scanning near-field optical microscopy (sSNOM) to unveil the spectral near-field response of 3C-SiC antenna arrays. We present a detailed description of the behavior of the antenna resonances by comparing far-field and near-field spectra and demonstrate the existence of a mode with no net dipole moment, absent in the far-field spectra, but of importance for applications that exploit the heightened electromagnetic near fields. Furthermore, we investigate the perturbation in the antenna response induced by the presence of the AFM tip, which can be further extended toward situations where for example strong IR emitters couple to LSPhP modes.
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Affiliation(s)
- Andrea Mancini
- Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maxilimians-Universität München, 80539 München, Germany
| | - Christopher R Gubbin
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Rodrigo Berté
- Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maxilimians-Universität München, 80539 München, Germany
| | - Francesco Martini
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
- Istituto di Fotonica e Nanotecnologie-CNR, Via Cineto Romano 42, 00156 Roma, Italy
| | - Alberto Politi
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Emiliano Cortés
- Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maxilimians-Universität München, 80539 München, Germany
| | - Yi Li
- School of Microelectronics, MOE Engineering Research Center of Integrated Circuits for Next Generation Communications, Southern University of Science and Technology, Shenzhen 518055, China
| | - Simone De Liberato
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Stefan A Maier
- Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maxilimians-Universität München, 80539 München, Germany
- Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
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Wang H, Janzen E, Wang L, Edgar JH, Xu XG. Probing Mid-Infrared Phonon Polaritons in the Aqueous Phase. NANO LETTERS 2020; 20:3986-3991. [PMID: 32320254 DOI: 10.1021/acs.nanolett.0c01199] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Phonon polaritons (PhPs) are collective phonon oscillations with hybridized electromagnetic fields, which concentrate mid-infrared optical fields that can match molecular vibrations. The utilization of PhPs holds the promise for chemical sensing tools and polariton-enhanced nanospectroscopy. However, investigations and innovations on PhPs in the aqueous phase remain stagnant because of the lack of in situ mid-infrared nanoimaging methods in water. Strong infrared absorption from water prohibits optical delivery and detection in the mid-infrared for scattering-type near-field microscopy. Here, we present our solution: the detection of photothermal responses caused by the excitation of PhPs by liquid phase peak force infrared (LiPFIR) microscopy. Characteristic interference fringes of PhPs in 10B isotope-enriched h-BN were measured in the aqueous phase and their dispersion relationship extracted. LiPFIR enables the measurement of mid-infrared PhPs in the fluid phase, opening possibilities and facilitating the development of mid-IR phonon polaritonics in water.
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Affiliation(s)
- Haomin Wang
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Eli Janzen
- Tim Taylor Department of Chemical Engineering, Kansas State University, Durland Hall, Manhattan, Kansas 66506, United States
| | - Le Wang
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - James H Edgar
- Tim Taylor Department of Chemical Engineering, Kansas State University, Durland Hall, Manhattan, Kansas 66506, United States
| | - Xiaoji G Xu
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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