Broadly tunable filter based on a graphene MEMS-photonic crystal composite structure and its application in single-pixel full-color displays

Abstract

A wide tunable narrowband filter composed of a graphene microelectromechanical system and a photonic crystal microcavity composite structure is investigated. The research reveals that the resonant transmission peak of this device can be continuously tuned over a range exceeding 200 nm, with a modulation voltage of less than 1.5 V. The voltage sensitivity of the resonant transmission peak can reach a maximum of −414.3 nm V⁻¹. Benefiting from the minimal deformation of the Bragg mirror with external voltage, the full width half maximum (FWHM) of the transmission peak can be reduced to as low as 0.72 nm. Furthermore, by utilizing the wide tunable range of this device, a wide color gamut range can be achieved in single-pixel, with a color gamut width reaching 159% of the Adobe RGB color gamut. This compact and low-power device holds significant application prospects in fields such as optical communication, spectral and chemical analysis, and wearable display devices.