Wood Anomalies and Surface-Wave Excitation with a Time Grating
書誌事項
- 公開日
- 2020-09-17
- 権利情報
-
- https://link.aps.org/licenses/aps-default-license
- DOI
-
- 10.1103/physrevlett.125.127403
- 10.48550/arxiv.2004.09178
- 公開者
- American Physical Society (APS)
この論文をさがす
説明
In order to confine waves beyond the diffraction limit, advances in fabrication techniques have enabled subwavelength structuring of matter, achieving near-field control of light and other types of waves. The price is often expensive fabrication needs and the irreversibility of device functionality, as well as the introduction of impurities, a major contributor to losses. In this Letter, we propose temporal inhomogeneities, such as a periodic drive in the electromagnetic properties of a surface which supports guided modes, to circumvent the need for subwavelength fabrication in the coupling of propagating waves to evanescent modes across the light line, achieving the temporal counterpart of the Wood anomaly. We show analytically and numerically how this concept is valid for any material platform and at any frequency, and propose and model a realistic experiment in graphene to couple terahertz radiation to plasmons with unit efficiency, demonstrating that time-modulation of material properties could be a tunable, lower-loss and fast-switchable alternative to the subwavelength structuring of matter for near-field wave control.
5 pages, 4 figures
収録刊行物
-
- Physical Review Letters
-
Physical Review Letters 125 (12), 127403-, 2020-09-17
American Physical Society (APS)
