We have developed angular-insensitive birefringent filters using discotic and calamitic liquid crystals. The filters show no angle dependence in oblique directions and the field of view exceeds +/- 60 degrees. Since the multilayer discotic and calamitic liquid crystal films have the same retardation in the oblique and normal directions, the filter achieves completely angle-insensitive optical properties. This optical filter is expected to be used in high precision and thin small devices in telecommunications and sensor applications.
We have developed a new method to detect the optical rotation of glucose in the aqueous humor with high accuracy, separating the influence of the cornea with a phase difference thousands of times larger than that of glucose. Using this method and a simple experimental system simulating the eye (cornea and aqueous humor), we confirmed the detection of optical rotation of glucose at a normal glucose concentration equivalent (approximately 100 (mg/dl)) to aqueous glucose solution. We believe that this result will significantly advance the development of painless noninvasive glucose sensors.
We have developed a reflective polarization volume grating using liquid crystal applicable to the wavelength band of optical communication. This diffraction element has the features of realizing both high diffraction angle and high diffraction efficiency which could not be achieved with conventional elements. In order to apply these features to the optical communication wavelength bands, we achieved the alignment of liquid crystal with the required film thickness (7 μm), and, we confirmed high diffraction efficiency (95%) with large diffraction angle (1800 lines/mm) at the optical communication wavelength (1550 nm). In addition, we also confirmed that the high efficiency is maintained approximately 100 nm wavelength band width. We believe that this liquid crystal polarization volume grating can contribute to increasing the transmission speed with low error due to mixed wavelengths in the high wavelength resolution transmission.
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