Electrically Driven Varifocal Silicon Metalens
| Autor: | Josep Canet-Ferrer, Adeel Afridi, Pascal Berto, Romain Quidant, Johann Osmond, Laurent Philippet |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Silicon ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Phase (waves) FOS: Physical sciences Physics::Optics chemistry.chemical_element Applied Physics (physics.app-ph) 02 engineering and technology 01 natural sciences Silicon Metalens law.invention 010309 optics Planar law 0103 physical sciences Focal length Electrical and Electronic Engineering Física [Àrees temàtiques de la UPC] business.industry Optics Physics - Applied Physics Òptica 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry Rayleigh length Optoelectronics Resistor 0210 nano-technology business Refractive index Optics (physics.optics) Physics - Optics Biotechnology Voltage |
| Zdroj: | ACS Photonics UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.8b00948 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|