Nonlinear holography emerges as a promising technique for optical storage and optical display, in which the newly-generated optical frequencies not only provide extra multiplexing channels but also help in security encryption. Recently, the successful fabrication of 3D nonlinear photonic crystal (NPC) through femtosecond laser writing provides a powerful platform for multi-functional nonlinear holography. Here, we report the novel designs of 3D NPC structures for 3D dynamic holography and image processing at harmonic waves.

Conventional optical imaging systems have played a crucial role in various biomedical applications, including diagnosis, drug development, and tissue engineering. However, they usually suffer from the requirements of bulky optical components, particularly when operating in environments with limited space. Metasurfaces, composed of artificially thin nanostructures that manipulate light at the nanoscale level enabling precise control of the phase, amplitude, and polarization of light, offer a promising solution to the limitation. These technologies can be used in a wide range of bio-imaging applications, including light sheet microscopy, endoscopy, confocal microscopy, and more. In this talk, we will explore the use of metasurfaces in various bio-imaging applications and discuss their potential for revolutionizing diagnosis and treatment in the biomedical field.

Far-field super-resolution optical technology provides ways for high-capacity super-resolution optical data storage. Typical techniques necessitate high laser beam power and lead to photo-damage. Since they can convert near-infrared excitation to ultraviolet and visible emission, upconversion nanoparticles have potential for photo-activation. Furthermore, they have excited energy levels with long lifetime for low-power super-resolution optical microscopy. We demonstrate the application of upconversion nanoparticles with high-order luminescence emission for low-power super-resolution photo-activation for low-power super-resolution optical data storage. Upconversion nanoparticles were mixed with photo-active compounds. To stimulate photo-activation in the nanocomposite, super-resolution irradiation was used. Written features demonstrated super-resolution size upon low laser beam power.

Vector vortex beams (VVBs) have attracted world’s attention due to its promise of unprecedented capabilities for applications. It is important that develop an easy and feasible method to character the spatially inhomogeneous distribution of polarization of VVB. In this paper, we propose a method for measuring the polarization distribution of arbitrary vector vortex beams using polarization holography. The experimental results show that the results measured by polarization holography for VVBs are basically similar to those measured by the conventional method. We believe that polarization holography is expected to become a popular optical component processing technology in future.

The theory, design techniques, and fabrication of high harmonic diffractive (HHD) lenses is presented. HHD lenses are of high interest for ultralightweight and large aperture imaging systems. The interesting chromatic focal characteristics, image quality, and correction subsystems are discussed that can provide high image quality (achromatic and apochromatic) over broad optical bandwidths. A fabrication example is given of an HHD lens combined with a molded glass HHD lens combined with a single-order diffractive Fresnel lens, which is called a multiple-order diffractive engineered surface (MODE) lens. This type of lens is being developed for ultralightweight space telescopes, although they will have application in other areas.

Augmented Reality (AR) devices optically superimpose information over the real world through an optical channel which angular resolution is limited by total internal reflection in the image guide. This limitation is governed by packaging size, Field of View, resolution, and the brightness. We discuss two multiplexing and de-multiplexing methods to address this challenge. By applying wavelength and time multiplexing, like, what is used in optical communication. Along with diffraction multiplexing via an array of facets, an increase in the effective optical bandwidth for the AR display is demonstrated. The demonstrated hybrid approach NED projection system combines multiple domains of multiplexing to enhance the FOV of displays without the typical package volume and energy consumption trade-offs. Showing the untapped potential of multiplexing on Digital Micro-mirror Devices based near-to-eye displays.