Electrically Driven Varifocal Silicon Metalens
Optical metasurfaces have shown to be a powerful approach to planar optical elements, enabling an unprecedented control over light phase and amplitude. At that stage, where a wide variety of static functionalities have been accomplished, most efforts are being directed toward achieving reconfigurabl...
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Published in | ACS photonics Vol. 5; no. 11; pp. 4497 - 4503 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
21.11.2018
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Subjects | |
Online Access | Get full text |
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Abstract | Optical metasurfaces have shown to be a powerful approach to planar optical elements, enabling an unprecedented control over light phase and amplitude. At that stage, where a wide variety of static functionalities have been accomplished, most efforts are being directed toward achieving reconfigurable optical elements. Here, we present our approach to an electrically controlled varifocal metalens operating in the visible frequency range. It relies on dynamically controlling the refractive index environment of a silicon metalens by means of an electric resistor embedded into a thermo-optical polymer. We demonstrate precise and continuous tuneability of the focal length and achieve focal length variation larger than the Rayleigh length for voltage as small as 12 V. The system time-response is of the order of 100 ms, with the potential to be reduced with further integration. Finally, the imaging capability of our varifocal metalens is successfully validated in an optical microscopy setting. Compared to conventional bulky reconfigurable lenses, the presented technology is a lightweight and compact solution, offering new opportunities for miniaturized smart imaging devices. |
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AbstractList | Optical metasurfaces have shown to be a powerful approach to planar optical elements, enabling an unprecedented control over light phase and amplitude. At that stage, where a wide variety of static functionalities have been accomplished, most efforts are being directed toward achieving reconfigurable optical elements. Here, we present our approach to an electrically controlled varifocal metalens operating in the visible frequency range. It relies on dynamically controlling the refractive index environment of a silicon metalens by means of an electric resistor embedded into a thermo-optical polymer. We demonstrate precise and continuous tuneability of the focal length and achieve focal length variation larger than the Rayleigh length for voltage as small as 12 V. The system time-response is of the order of 100 ms, with the potential to be reduced with further integration. Finally, the imaging capability of our varifocal metalens is successfully validated in an optical microscopy setting. Compared to conventional bulky reconfigurable lenses, the presented technology is a lightweight and compact solution, offering new opportunities for miniaturized smart imaging devices. |
Author | Philippet, Laurent Canet-Ferrer, Josep Osmond, Johann Afridi, Adeel Berto, Pascal Quidant, Romain |
AuthorAffiliation | The Barcelona Institute of Science and Technology ICREA- Institució Catalana de Recerca i Estudis Avançats Neurophotonics Laboratory, CNRS UMR 8250 |
AuthorAffiliation_xml | – name: The Barcelona Institute of Science and Technology – name: Neurophotonics Laboratory, CNRS UMR 8250 – name: ICREA- Institució Catalana de Recerca i Estudis Avançats |
Author_xml | – sequence: 1 givenname: Adeel orcidid: 0000-0001-5402-7485 surname: Afridi fullname: Afridi, Adeel organization: The Barcelona Institute of Science and Technology – sequence: 2 givenname: Josep surname: Canet-Ferrer fullname: Canet-Ferrer, Josep organization: The Barcelona Institute of Science and Technology – sequence: 3 givenname: Laurent surname: Philippet fullname: Philippet, Laurent organization: The Barcelona Institute of Science and Technology – sequence: 4 givenname: Johann surname: Osmond fullname: Osmond, Johann organization: The Barcelona Institute of Science and Technology – sequence: 5 givenname: Pascal surname: Berto fullname: Berto, Pascal organization: Neurophotonics Laboratory, CNRS UMR 8250 – sequence: 6 givenname: Romain surname: Quidant fullname: Quidant, Romain email: romain.quidant@icfo.eu organization: ICREA- Institució Catalana de Recerca i Estudis Avançats |
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Keywords | electro-thermo-optical control varifocal metalens reconfigurability dielectric nanodisks metasurfaces |
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Title | Electrically Driven Varifocal Silicon Metalens |
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