Session Index

Metasurfaces are flat optical devices consisting of artificially fabricated photonic meta-atoms with unique optical responses, and have been extensively studied for thier extraordinary abilities to modulate electromagnetic waves. Recent advances in the metasurface have revealed that flat metasurface optics can be implemented with various functions or tremendous performance compared to conventional optics, showing great potential for future imaging applications. For example, high-quality metasurface holography with both spatial amplitude and phase information at subwavelength-scale resolution is achieved, mitigating chronic bottlenecks in traditional holograms. In addition, metasurface lenses, called metalenses, have powerful features such as a flatness, a high numerical aperture, and multi-functions that do not appear in convensional optical lenses. Based on these meta-optics, several practical studies on imaging applications have recently been reported. In this talk, we will present several optical metasurface applications for three-dimensional imaging. Physical mechanisms and concepts of various optical metasurfaces will be outlined. Then, we will discuss their recent states for optical applications such as holography, microscope, and augmented reality. Especially, our recent works will be introduced that show their feasiblity in augmented reality imaging with ultrawide field of view not shown in convensional optics. Finally, our perspectives in this area will be discussed.

 

Displacement related measuring techniques play an important role in modem technology, being widely applied in many fields, such as in the semiconductor industry, precision manufacturing, and in metrology instruments. In current research, much attention is being paid to the development of more precise measuring devices or methods with the ability to provide exact displacement information with higher precision. Laser interferometers are very useful for displacement measurement. However, due to the fact that most interferometers are based on a non-common optical path (NCOP) design, it is difficult to avoid the problem of environmental disturbance arising from temperature fluctuations, air drift, etc. In order to improve the problems faced by the traditional interferometers, I have exerted much effort for the development of a heterodyne grating interferometer based on a quasi-common-optical-path (QCOP) configuration for displacement measurement. The QCOP configuration means that the measurement and reference beams of the interferometer have almost equivalent optical paths. Surrounding disturbances can be compensated for by this configuration, making the system less sensitive to environmental disturbances. The measurement system consists of a heterodyne light source, two-dimensional holographic grating, specially designed set of half-wave plates, and lock-in amplifiers. The QCOP design relies on the phase shift between the zeroth and first diffraction orders. The measurement system has a stability of less than 14 nm over 1 hr. Based on the QCOP design, a positioning system capable of nanometer resolution over the millimeter traveling range was developed. The device achieved a positioning resolution of 2.3 nm over a traveling range of 20 mm.

 

In this paper we demonstrate fabrication of large scale liquid crystal device with graphene-based electrodes. Various measurements was used to characterize graphene properties. Photo alignment method was used instead of mechanical rubbing technique to preserve the graphene layer underneath. Identical modulation characteristics over entire surface area was measured.

 

This research proposes an improve polarization converter which can generate radially and azimuthally polarized beams. In this design, it has advantages of a simple, symmetric, compact, and robust structure. Furthermore, the use of lateral displacement beamsplitters reduces the cost, substantially. Moreover, this design has high potential in related applications.

 

A novel all-optical integrated dual-tomography (AO-IDT) system is proposed and demonstrated by combining phase-only SLM based digital holographic microscopy with optical tweezer. A free-floating cell is trapped and rotated in full-angle directions; illumination beam is scanned for each rotation and transmitted wavefronts are combined for enlarged isotropic spatial frequency coverage