In this era of digital advancement, securing communication and data has become crucial. Nanophotonic metasurfaces have shown great potential in light manipulation, but they are limited in spectral range and wavelength handling. This limitation hampers their effectiveness in optical imaging and information encryption, where broader spectral coverage and multiple resonant peaks are desired. We propose an innovative approach to address these challenges. Our multi-resonant high-Q metasurface platform integrates subwavelength plasmonic meta-atoms with a specially designed DBR substrate. This platform enables simultaneous excitation of multiple high-Q resonant modes across a broad spectrum. Through optimizing the nanostructures, the metasurface can support up to 15 high-Q peaks without compromising operational efficiency. To demonstrate our platform's performance, we present two practical applications. The first is a hyperspectral imaging system using a single multi-wavelength metasurface chip. The second application combines structural color printing and vectorial holographic imaging for advanced optical information encryption, leveraging our platform's capabilities.

The manipulation of focused light beams is widely used in our lives, such as camera lenses and signal transmission. Although there are traditional lenses that realize off-axis focusing, the requirements of tilting need extra space, and the tilting stage hinders its compact integration. These disadvantages hinder the development of device miniaturization or increased construction complexity. Meta-devices composed of artificial nanostructures can manipulate the incident electromagnetic wave's phase, polarization, and amplitude. Meta-devices show excellent performance and novel applications to meet optical demands. The significant advantages of meta-devices are their new properties, lighter weight, and compact size. Here, we demonstrate cascaded meta-devices for focal length tuning in the z-axis (1-dimensional, 1D), focal spot manipulation in the x-y plane (2-dimensional, 2D), and x-y-z axis (3-dimensional, 3D). The varifocal meta-devices are used for bioimaging and 6G signal transmission.

The data increase necessitates high-capacity, low-energy optical data storage. Bridging the memory gap between units and processors requires techniques and materials mimicking the efficiency of the human brain’s memory based on synaptic plasticity. Optical techniques show promise, yet energy-efficient optical data storage compels advanced media. Upconversion nanoparticles are luminescent nanomaterials for high-capacity, low-energy optical data storage. We used upconversion nanoparticles for ultra-low-energy optical data storage with synaptic-like behaviour by switching upconversion states under low light power irradiation. We achieved features with sub-nanojoule-level energy consumption and synaptic-like functions of the human brain’s memory, enabling short-term and long-term memory.

Adaptive optics normally concerns the feedback correction of phase aberrations. Such correction has been of benefit in various optical systems, with applications ranging in scale from astronomical telescopes to superresolution microscopes. Here we extend this powerful tool into the vectorial domain, encompassing higher dimensional feedback correction of both polarisation and phase. This technique is termed vectorial adaptive optics (V-AO). This technique pushes the boundaries of traditional scalar beam shaping by providing feedback control of extra vectorial degrees of freedom. This paves the way for next generation AO functionality by manipulating the complex vectorial field.

Our report details a novel approach using polarization holography for the precise detection of vector vortex beams' (VVBs) polarization distribution. We will discuss multiple methodologies facilitated by this technique, offering insights into VVBs' characterization. Upon successful detection, we extract the VVBs' polarization states, allowing for their accurate placement on the Poincaré sphere. The obtained results affirm polarization holography's potential as an effective alternative to conventional measurement methods. This advancement propels polarization holography towards widespread adoption in optical component processing.

We have developed flexible and stretchable terahertz/infrared imaging sheets with carbon nanotube films. We report on multi-view terahertz/infrared visualization, which have enabled us to fully image both the whole outer and inner surface of various objects. We show several examples of omnidirectional terahertz/infrared imaging inspections in a non-destructive and non-contact manner.

A wavelength and time multiplexed image transfer by employing multiple light sources and volume hologram grating expands the field-of-view of the image guide combiner for near-to-eye beyond its total internal reflection limit.

Potential of diffraction grating formed inside a transparent medium generated by sound wave is investigated for display applications. The typical range of surface deformation and index modulation is calculated.

Deflectometry is an established technique in optical metrology used for ultra-precise 3D measurements of specular surfaces. This talk will discuss how deflectometric information can be utilized for novel eye-tracking methods that evaluate the gaze direction in single-shot with high accuracy. Potentials and limitations of different flavors will be discussed.

Reflective Micro Electro Mechanical System (MEMS) display as a spatial light modulator with synchronized nano-second pulse effectively diffracts light into one of multiple diffraction orders with high efficiency. Beam and image steering in a time sequential manner by this principle is applied for optical systems such as lidar, near-to-eye display and high-framerate cameras. We overview diffractive MEMS based beam and image steering by using a concept Time-to-Angle Conversion.

A wavelength and time multiplexed image transfer by employing multiple light sources and volume hologram grating expands the field-of-view of the image guide combiner for near-to-eye beyond its total internal reflection limit.