Abstract
The progress of metaoptics relies on identifying photonic materials and geometries, the combination of which represents a promising approach to complex and desired optical functionalities. Material candidate options are primarily limited by natural availability. Thus, the search for meta-atom geometries, by either forward or inverse means, plays a pivotal role in achieving more sophisticated phenomena. Past efforts mainly focused on building the geometric library of individual meta-atoms and synthesizing various ones into a design. However, those efforts neglected the powerfulness of perturbative metaoptics due to the perception that perturbations are usually regarded as adverse and in need of being suppressed. Here, we report a perturbation-induced countersurveillance strategy using compound nanosieves mediated by structural and thermal perturbations. Private information can be almost perfectly concealed and camouflaged by the induced thermal-spectral drifts, enabling information storage and exchange in a covert way. This perturbative metaoptics can self-indicate whether the hidden information has been attacked during delivery. Our results establish a perturbative paradigm of securing a safer world of information and internet of things.
Highlights
Metaoptics has enabled tremendous fundamental discoveries and novel applications[1,2,3,4,5], which further our understanding of the world and enrich our daily life with wonders
Perturbations are usually regarded as adverse to the designed functionalities and in need of being suppressed, especially in systems with high quality factors[18,19,20] and structures with sizes down to the nanoscale[21,22,23,24,25,26]. This factor results in neglecting the powerfulness of perturbations as a positive component in metaoptics, removing the possibility to open up the research world of perturbative metaoptics, which may be rich in interesting phenomena and promising applications
The origin of perturbative metaoptics Metamaterials and metasurfaces have recently enabled a number of novel advanced information security approaches with advantages of high capacity and security[28,29,30,31,32,33,34], opening up a new avenue for applications of metaoptics
Summary
Metaoptics has enabled tremendous fundamental discoveries and novel applications[1,2,3,4,5], which further our understanding of the world and enrich our daily life with wonders. A general way in this research is to build a library of individual geometric meta-atoms and to integrate a variety of them into a design to achieve the desired phenomena In this strategy, perturbations (i.e., the small deviation of structural parameters) are usually regarded as adverse to the designed functionalities and in need of being suppressed, especially in systems with high quality factors[18,19,20] and structures with sizes down to the nanoscale[21,22,23,24,25,26]. Perturbations have recently been used to theoretically solve the problem of reverse design in elastic metamaterials[27], which indicates the potential of
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