Session Index

This paper proposes a new head-mounted device evaluation system, which uses a large-amplitude wavefront detector to measure the MR device, and uses program control to change the position of the light field. Finally, various information such as light intensity and aberration of the light source are obtained.

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Metalens is constructed of an artificial structure with a subwavelength period. It starts by growing GaN on the sapphire substrate and then spin-coated positive photoresist. Metalens pattern is transferred onto photoresist by an exposure process with EBL, and 50 nm thick nickel film is deposited on the sample. Subsequently, the photoresist is removed by the lift-off process. Finally, we employ the top-down approach to accomplish high-aspect-ratio GaN nanopillars. Our measurement setup combines with a twisted nematic liquid crystal to demonstrate the focusing ability of metalens to observe the light image focused by metalens in different polarized incident lights.

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Optical dispersion could severely affect pulse duration in ultrashort pulse laser. Therefore an accurate dispersion measurement and temporal pulse shaper is demonstrated for pulse compression. The present study proposes a 4-f deformable mirror (DM) pulse shaper integrated with spatial spectral interferometer (SSI) and SEA TADPOLE (spatially encoded arrangement temporal analysis by dispersion a pair of light e-field). The voltage vectors of DM are identified based on optical phase slope variation and are implemented with closed-loop PI controller. The experiment results show that the dispersion mode can be identified , and the identified modes shows great linearity with DM voltages squared.

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In this research, we demonstrate metalenses for collimation with different deflection angles. Because of the reversibility of the optical path, we use the reverse structure of imaging, i.e., several dipole sources placed on the focal point in front of metalenses. The divergent angles of the nearly collimated beams are more than plane waves by about +-0.15 degrees at full-width at half-maximum (FWHM), and the efficiencies are all above 70%.

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An optical module based on a liquid crystal (LC)-in-cavity structure is proposed for a miniature near-infrared spectrometer. By alternately coating dielectric materials on a glass substrate to form a multilayer film and allowing such two identical dielectric mirrors coated with conductive layers to sandwich a LC defect layer, defect modes within the photonic bandgap (PBG) can be generated. The wavelengths of the transmitted peaks of the defect modes can be manipulated by AC voltage. Because of the small volume, easy fabrication and low cost, this PBG structure characterized by tunable defect modes is an outstanding candidate for miniature spectrometer development.

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TBA

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