All-optical directional switching of non-thermal photocurrents in plasmonic nanocircuits
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arXiv
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| Format: | Preprint |
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2025
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| author | Zapata, Roméo Singh, Diana Markovic, Obren Hareau, Chantal Yang, Xingyu Mou, Ye Schwob, Catherine Gallas, Bruno Sanz-Paz, Maria Colas-des-Francs, Gérard Bouhelier, Alexandre Mivelle, Mathieu |
| author_facet | Zapata, Roméo Singh, Diana Markovic, Obren Hareau, Chantal Yang, Xingyu Mou, Ye Schwob, Catherine Gallas, Bruno Sanz-Paz, Maria Colas-des-Francs, Gérard Bouhelier, Alexandre Mivelle, Mathieu |
| contents | Controlling the flow of electricity in metallic circuits with light is a key goal for future optoelectronics. In this work, we demonstrate all-optical generation and directional control of non-thermal drift photocurrents in a plasmonic gold wire. We attribute this phenomenon to the Inverse Faraday Effect and show that the current's direction can be precisely reversed at a subwavelength scale by tailoring the incident light's polarization or laser beam position. A bespoke polarization modulation technique is employed to unambiguously separate ultrafast drift currents from the ubiquitous photothermal background. We further reveal a collaborative mechanism where macroscopic thermal gradients, acting as a driving force, are used to extract and remotely detect the locally-generated nanoscale photocurrents. This robust control and detection scheme paves the way for reconfigurable, all-optical nanocircuitry capable of ultrafast on-chip processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_01480 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | All-optical directional switching of non-thermal photocurrents in plasmonic nanocircuits Zapata, Roméo Singh, Diana Markovic, Obren Hareau, Chantal Yang, Xingyu Mou, Ye Schwob, Catherine Gallas, Bruno Sanz-Paz, Maria Colas-des-Francs, Gérard Bouhelier, Alexandre Mivelle, Mathieu Optics Controlling the flow of electricity in metallic circuits with light is a key goal for future optoelectronics. In this work, we demonstrate all-optical generation and directional control of non-thermal drift photocurrents in a plasmonic gold wire. We attribute this phenomenon to the Inverse Faraday Effect and show that the current's direction can be precisely reversed at a subwavelength scale by tailoring the incident light's polarization or laser beam position. A bespoke polarization modulation technique is employed to unambiguously separate ultrafast drift currents from the ubiquitous photothermal background. We further reveal a collaborative mechanism where macroscopic thermal gradients, acting as a driving force, are used to extract and remotely detect the locally-generated nanoscale photocurrents. This robust control and detection scheme paves the way for reconfigurable, all-optical nanocircuitry capable of ultrafast on-chip processing. |
| title | All-optical directional switching of non-thermal photocurrents in plasmonic nanocircuits |
| topic | Optics |
| url | https://arxiv.org/abs/2512.01480 |