In pursuit of photo-induced magnetic and chiral microscopy★
University of California Irvine, Department of Electrical Engineering and Computer Science,
2 University of California Irvine, Department of Chemistry, 92697 Irvine, CA, USA
* e-mail: email@example.com
Accepted: 24 January 2018
Published online: 1 June 2018
Light-matter interactions enable the perception of specimen properties such as its shape and dimensions by measuring the subtle differences carried by an illuminating beam after interacting with the sample. However, major obstacles arise when the relevant properties of the specimen are weakly coupled to the incident beam, for example when measuring optical magnetism and chirality. To address this challenge we propose the idea of detecting such weakly-coupled properties of matter through the photo-induced force, aiming at developing photo-induced magnetic or chiral force microscopy. Here we review our pursuit consisting of the following steps: (1) Development of a theoretical blueprint of a magnetic nanoprobe to detect a magnetic dipole oscillating at an optical frequency when illuminated by an azimuthally polarized beam via the photo-induced magnetic force; (2) Conducting an experimental study using an azimuthally polarized beam to probe the near fields and axial magnetism of a Si disk magnetic nanoprobe, based on photo-induced force microscopy; (3) Extending the concept of force microscopy to probe chirality at the nanoscale, enabling enantiomeric detection of chiral molecules. Finally, we discuss difficulties and how they could be overcome, as well as our plans for future work.
Key words: Photo-induced force microscopy / optical magnetism / chirality / magnetic force / chiral force / azimuthally polarized beam / structured light / nanostructures / magnetic nanoantenna / magnetic resonance
© J. Zeng et al., published by EDP Sciences, 2018
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