Abstract
All dielectric transmissive type polarization-tuned structural multicolor pixels (MCPs) are proposed and demonstrated based on a one-dimensional hydrogenated amorphous silicon (a-Si:H) grating integrated with a silicon nitride waveguide. Both bandpass and bandstop transmission filtering characteristics in the visible regime, centered at the same wavelength, have been achieved by tailoring the structural parameters including the duty ratio of the grating and the thickness of the dielectric waveguide. For the three manufactured MCPs, the transmission peak exceeds 70% for the transverse electric (TE) polarization and 90% for the transverse magnetic (TM) polarization as observed at the resonance and off-resonance wavelength, respectively. The polarization-switched transmissions are attributed to the guided mode resonance initiated by the interaction of the a-Si:H grating and the dielectric waveguide. A broad color palette covering the entire visible band was successfully realized from a suite of MCPs with varying grating pitches. The proposed structural color pixels are expected to facilitate the construction of dynamic displays, image sensors, optical data storage, security tags, and so forth.
Highlights
Color pixel has been demonstrated in reflection mode[17] while an all-dielectric transmissive tunable color pixel lacks its investigation
We propose and demonstrate an all dielectric polarization-tailored structural multicolor pixels (MCPs) based on an amorphous silicon (a-Si):H resonant grating, which are capable of responding to the transverse electric (TE) and transverse magnetic (TM) polarizations, so as to render vivid colors in additive-RGB and subtractive-CMY mode corresponding to the transmission peak and dip, respectively
The polarization angle of incident light is indicated by the alignment of the electric (E) field with respect to the x-direction so that the TE and TM polarizations refer to the E-field that is aligned parallel (θ = 0°) and perpendicular (θ = 90°) to the grating, respectively
Summary
Color pixel has been demonstrated in reflection mode[17] while an all-dielectric transmissive tunable color pixel lacks its investigation. We report an all-dielectric polarization-tuned transmissive color pixel which capitalizes 1D a-Si:H based on GMR for the first time. We propose and demonstrate an all dielectric polarization-tailored structural multicolor pixels (MCPs) based on an a-Si:H resonant grating, which are capable of responding to the transverse electric (TE) and transverse magnetic (TM) polarizations, so as to render vivid colors in additive-RGB and subtractive-CMY mode corresponding to the transmission peak and dip, respectively. The a-Si:H resonant grating has been thoroughly studied from the standpoint of color tuning by adjusting the periodicity of the grating and the polarization angle, thereby facilitating the creation of a broad range of color images. The proposed structural MCP, which is notable for its capacity to exhibit enhanced angular tolerance, is anticipated to play a vital role in polarization-sensitive security tags, anti-counterfeiting, holographic devices, ultrafast display devices, and optical data storage[4,5,20,21,22,23,24]
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