Electrically Tunable Optofluidic Metasurface.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41787700.
- Also identified by DOI 10.1021/acsnano.5c18915 and PMC identifier 13001100.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The dynamic control of light at the nanoscale has been a longstanding challenge in photonics. More recently, fluidics has been added to the toolkit, leveraging liquid properties as an additional degree of freedom for tunability. Here, we present a tunable metasurface architecture that integrates an optofluidic layer. We use a guided mode resonance platform, whereby a silicon nitride grating is coated with indium tin oxide (ITO) as the active material, operating in the visible-NIR wavelength range (∼800 nm). Our design employs an all-dielectric structure with a fluidic gate to overcome the efficiency-loss trade-off typical of other dynamic metasurfaces. We demonstrate spectral and phase tuning, achieving a near-2π phase shift with a low voltage swing (±3 V), as well as maintaining a strong resonance amplitude (<i>R</i> > 80%) with an all-pass filter configuration. These results establish a foundation for high-performance tunable metasurfaces with broad cross-disciplinary applications.