Polarization Selective Color Filter Based on Plasmonic Nanograting Embedded Etalon Structures

Abstract

In this paper, we propose a polarization-selective color filter that can generate two different color informations simultaneously depending on the polarization direction. The proposed color filter is mainly composed of the etalon structure to generate the color by the structural resonance properties while the upper layer of the etalon is made of plasmonic nanogratings to promote polarization-dependent color properties. When the duty ratio of the silver nanogratings is fixed, the proposed color filter can maintain identical optical properties for orthogonal polarization, while the etalon structure of the proposed color filter can manipulate different color information depending on the cavity height for the horizontal polarization. Finally, we experimentally confirm that polarization-dependent security images can be generated using the proposed color filters with a fixed duty ratio of various nanograting arrays.

Pillared cobalt metal–organic frameworks act as chromatic polarizers

“…In contrast, photonic metamaterials, whose properties follow from their nanostructured features, 20 are capable of showing a dichromatic linear dichroism, where changing the polarization of incident light the material leads to two distinct material colors. [21][22][23][24] This is a key advantage towards their application in polarimetry spectroscopy, security tags, and hyperspectral imaging, among others. 20,22,24 Interestingly, with regard to dichroic molecular crystals, the reticular chemistry concept behind metal-organic frameworks (MOFs) may offer a further degree of control over the orientation of molecules while simultaneously facilitating the use of well-known coordination complexes as chromophores.…”

Planar narrow bandpass filter based on Si resonant metasurface

“…This will potentially hinder the integration of such optical filters into the on-chip nanophotonics devices. The development of nanofabrication and nanomanufacturing gives new opportunities for designing optical filters based on nanoplasmonics or dielectric Mie resonances [41][42][43][44][45][46][47][48] . In this paper, we employ the multipolar resonance feature of dielectric metasurfaces, combining it with the BIC mechanisms, and design a Si metasurface based planar narrow-band-pass (PNBP) filter in the near infrared (NIR) spectral region.…”

Full Geometric Control of Hidden Color Information in Diffraction Gratings under Angled White Light Illumination

“…However, the combined use of these parameters to hide color information in gratings has not been achieved efficiently. Though previous works have used polarization selectivity , and directional stretching to encode color information in gratings, they are limited to only 2 independent polarization states or stretching directions that reveal the encoded information with no crosstalk. Hence, a solution to increase the information storage capacity of gratings is necessary.…”