Mooshammer, Fabian and Huber, Markus A. and Sandner, Fabian and Plankl, Markus and Zizlsperger, Martin and Huber, Rupert (2020) Quantifying Nanoscale Electromagnetic Fields in Near-Field Microscopy by Fourier Demodulation Analysis. ACS PHOTONICS, 7 (2). pp. 344-351. ISSN 2330-4022,
Full text not available from this repository. (Request a copy)Abstract
Confining light to sharp metal tips has become a versatile technique to study optical and electronic properties far below the diffraction limit. Particularly near-field microscopy in the mid-infrared spectral range has found a variety of applications in probing nanostructures and their dynamics. Yet, the ongoing quest for ultimately high spatial resolution down to the single-nanometer regime and quantitative three-dimensional nano-tomography depends vitally on a precise knowledge of the spatial distribution of the near fields emerging from the probe. Here, we perform finite element simulations of a tip with realistic geometry oscillating above a dielectric sample. By introducing a novel Fourier demodulation analysis of the electric field at each point in space, we reliably quantify the distribution of the near fields above and within the sample. Besides inferring the lateral field extension, which can be smaller than the tip radius of curvature, we also quantify the probing volume within the sample. Finally, we visualize the scattering process into the far field at a given demodulation order, for the first time, and shed light onto the nanoscale distribution of the near fields, and its evolution as the tip-sample distance is varied. Our work represents a crucial step in understanding and tailoring the spatial distribution of evanescent fields in optical nanoscopy.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANALYTICAL-MODEL; SPECTROSCOPY; ULTRAFAST; POLARITONS; ABSORPTION; NANOWIRES; PROBES; TIP; scattering-type SNOM; mid-infrared; nanoscopy; tomography; finite element method; demodulated fields |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Mar 2021 07:11 |
| Last Modified: | 31 Mar 2021 07:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/45249 |
Actions (login required)
 |
View Item |
