Suppressing meta-holographic artifacts by laser coherence tuning

Abstract

A metasurface hologram combines fine spatial resolution and large viewing angles with a planar form factor and compact size. However, it suffers coherent artifacts originating from electromagnetic cross-talk between closely packed meta-atoms and fabrication defects of nanoscale features. Here, we introduce an efficient method to suppress all artifacts by fine-tuning the spatial coherence of illumination. Our method is implemented with a degenerate cavity laser, which allows a precise and continuous tuning of the spatial coherence over a wide range, with little variation in the emission spectrum and total power. We find the optimal degree of spatial coherence to suppress the coherent artifacts of a meta-hologram while maintaining the image sharpness. This work paves the way to compact and dynamical holographic displays free of coherent defects.

Angular‐Encrypted Quad‐Fold Display of Nanoprinting and Meta‐Holography for Optical Information Storage

“…During the past decade, the invention of metasurface has created a promising device platform to boost information density and encryption. [ 1–8 ] Featured with virtually two‐dimensional planar surfaces and artificial subwavelength‐scale nano‐textured patterns, metasurfaces have been studied and demonstrated to control light waves across the entire spectral range and enable various optical applications and functionalities, including optical cloaking, [ 9,10 ] plasmonic coloring, [ 11 ] wavefront shaping, [ 12–15 ] meta‐lenses, [ 16,17 ] meta‐holography, [ 18–23 ] etc.…”

“…Due to its compact scale and programmable versatility, more recent endeavors on metasurface have demonstrated to make it a competitive candidate for optical information encryption and storage. [ 1–8 ] For instance, by encoding the spectral amplitude/phase response, nanoprinting [ 24,25 ] /holography [ 18–23 ] graphs and encryption have been created to exhibit high‐resolution displays, which are attainable under microscopes or projected on an optical screen. Other attempts have also been made to successfully enable the simultaneous multiplexing channels of both nanoprinting and meta‐holography.…”

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to control light waves across the entire spectral range and enable various optical applications and functionalities, including optical cloaking, [9,10] plasmonic coloring, [11] wavefront shaping, [12][13][14][15] meta-lenses, [16,17] meta-holography, [18][19][20][21][22][23] etc.Due to its compact scale and programmable versatility, more recent endeavors on metasurface have demonstrated to make it a competitive candidate for optical information encryption and storage. [1][2][3][4][5][6][7][8] For instance, by encoding the spectral amplitude/phase response, nanoprinting [24,25] /holography [18][19][20][21][22][23] graphs and encryption have been created to exhibit high-resolution displays, which are attainable under microscopes or projected on an optical screen. Other attempts have also been made to successfully enable the simultaneous multiplexing channels of both nanoprinting and metaholography.

…”

“…to control light waves across the entire spectral range and enable various optical applications and functionalities, including optical cloaking, [9,10] plasmonic coloring, [11] wavefront shaping, [12][13][14][15] meta-lenses, [16,17] meta-holography, [18][19][20][21][22][23] etc.…”

Dynamic Augmented Reality Display by Layer‐Folded Metasurface via Electrical‐Driven Liquid Crystal

“…absorber, [1,2] nanoprinting display, [3][4][5] beam steering, [6,7] metalens, [8,9] metaholography, [10][11][12][13][14][15][16][17][18] and many others. [19,20] However, heading toward the development and achievement of more powerful meta-devices and even more complicated meta-systems, it inevitably demands the cascading and coupling between multilayer metasurfaces as a feasible design strategy.…”