A fluid-based active plasmonic grating filter

An advanced electrowetting fluid manipulation technology is adopted to realize the dynamic redistribution of the surrounding fluid media of silver grating, and thereby, the surface plasmon resonance is real-timely modulated. The results indicated that the wavelength of the resonance absorption peak of the designed fluid-based grating filter can be tuned smoothly and continuously by simply varying the electrowetting voltage. More importantly, the modulation is reversibly operated, fast responded, and energy efficient and can be flexibly integrated. By combining this electrowetting filtering function with the appropriate structural parameters according to the practical demands, such novel design can realize the fine-tuning of light covering the entire visible spectrum.