1.The Andrew & Erna Viterbi Faculty of Electrical & Computer Engineering, Technion—Israel Institute of Technology, Haifa 3200003, Israel
2.Department of Physical Engineering, Polytechnic University of Tirana—Faculty of Physical & Math Engineering, Tirana 1000, Albania
3.Faculty of Medical Sciences, Albanian University, Durrës Street, Tirana 1000, Albania
4.Department of Physics, MIT—Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
Guy Bartal (guy@ee.technion.ac.il)
Published:31 December 2024,
Published Online:24 October 2024,
Received:21 February 2024,
Revised:27 July 2024,
Accepted:27 August 2024
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Kher-Aldeen, J. et al. Dynamic control and manipulation of near-fields using direct feedback. Light: Science & Applications, 13, 3151-3157 (2024).
Kher-Aldeen, J. et al. Dynamic control and manipulation of near-fields using direct feedback. Light: Science & Applications, 13, 3151-3157 (2024). DOI: 10.1038/s41377-024-01610-2.
Shaping and controlling electromagnetic fields at the nanoscale is vital for advancing efficient and compact devices used in optical communications
sensing and metrology
as well as for the exploration of fundamental properties of light-matter interaction and optical nonlinearity. Real-time feedback for active control over light can provide a significant advantage in these endeavors
compensating for ever-changing experimental conditions and inherent or accumulated device flaws. Scanning nearfield microscopy
being slow in essence
cannot provide such a real-time feedback that was thus far possible only by scattering-based microscopy. Here
we present active control over nanophotonic near-fields with direct feedback facilitated by real-time near-field imaging. We use far-field wavefront shaping to control nanophotonic patterns in surface waves
demonstrating translation and splitting of near-field focal spots at nanometer-scale precision
active toggling of different near-field angular momenta and correction of patterns damaged by structural defects using feedback enabled by the real-time operation. The ability to simultaneously shape and observe nanophotonic fields can significantly impact various applications such as nanoscale optical manipulation
optical addressing of integrated quantum emitters and near-field adaptive optics.
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