Overcoming losses in superlenses with synthetic waves of complex frequency.

Autor: Guan F; New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China., Guo X; New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China.; CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China., Zeng K; New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China., Zhang S; CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China., Nie Z; Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA., Ma S; New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China., Dai Q; CAS Key Laboratory of Nanophotonic Materials and Devices, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China., Pendry J; The Blackett Laboratory, Department of Physics, Imperial College London, SW7 2AZ London, UK., Zhang X; New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China.; Faculty of Science, University of Hong Kong, Hong Kong, China.; Faculty of Engineering, University of Hong Kong, Hong Kong, China., Zhang S; New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China.; Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong, China.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2023 Aug 18; Vol. 381 (6659), pp. 766-771. Date of Electronic Publication: 2023 Aug 17.
DOI: 10.1126/science.adi1267
Abstrakt: Superlenses made of plasmonic materials and metamaterials can image features at the subdiffraction scale. However, intrinsic losses impose a serious restriction on imaging resolution, a problem that has hindered widespread applications of superlenses. Optical waves of complex frequency that exhibit a temporally attenuating behavior have been proposed to offset the intrinsic losses in superlenses through the introduction of virtual gain, but experimental realization has been lacking because of the difficulty of imaging measurements with temporal decay. In this work, we present a multifrequency approach to constructing synthetic excitation waves of complex frequency based on measurements at real frequencies. This approach allows us to implement virtual gain experimentally and observe deep-subwavelength images. Our work offers a practical solution to overcome the intrinsic losses of plasmonic systems for imaging and sensing applications.
Databáze: MEDLINE
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