Perturbative countersurveillance metaoptics with compound nanosieves

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.

Direction‐Controllable Plasmonic Color Scanning by Using Laser‐Induced Bubbles

“…Our research could open up new possibilities for the generation of ultracompact, efficient, and multi-dimensional multiplexing optical devices. We could envisage many promising applications including laser display, [47] colorimetric sensing, [48,49] anticounterfeiting, [50,51] information security, [52][53][54][55] and so forth.…”

Integrating lattice and gap plasmonic modes to construct dual-mode metasurfaces for enhancing light–matter interaction

“…Surprisingly, these three curves are nearly the same, and similar observations can also be obtained from the three λ G −P curves with P values of 350, 360, and 370 nm. Since current nanofabrication techniques can easily yield a precision within ±5 nm [5], the theoretical results in Fig. 2c indicate that the DMMs have a good tolerance for fabrication error, greatly benefiting their device applications.…”

“…Because of their intrinsic ability to confine electric fields (EFs) at a subwavelength scale, the resonant modes of photonic structures can sustain large EF enhancements and have brought about fruitful achievements in both fundamental and applied optics [1][2][3][4][5][6][7]. A variety of novel optical phenomena-such as Fano resonance [8], plasmon-exciton strong coupling [9], invisibility cloaking [10], giant circular dichroism [11], and large nonlinear response [12]-have been demonstrated using appropriately tailored resonant modes.…”

Lattice Constant Effect on Diffracted Transmission of ITO Periodic Nanostructures and Improvement of the Light Extraction Efficiency of Light-Emitting Diodes

“…However, owing to the large difference in the refractive indices between the semiconductor materials and the air, conventional LEDs still suffer from limited light extraction [8][9][10][11]. In the past three decades, a kind of typical periodic micro-structures-photonic crystals (PhCs)have attracted great interest due to their potential applications in the design of optical reflectors [12,13], absorbers [14], nanosieves [15], and filters [16,17].…”