Abstract:
Electrically controlled holographic varied-line-spacing (VLS) grating based on polymer dispersed liquid crystal (PDLC) is reported. Varied-line-spacing interference pattern is generated through interference between cylindrical wave and plane wave, and recorded in PDLC. Characteristics, such as spatial frequency, diffraction and electric-optic, are analyzed by experiments. The results show that the trend and range of grating period match well with the theoretical simulation. The relationships between diffraction efficiency and exposure intensity as well as exposure time are studied. The grating diffraction efficiency can be achieved more than 70% with spatial frequency from 530 mm
-1 to 650 mm
-1. Meanwhile, the grating has good electrically controlled property. The threshold voltage is 2.4 V/μm, and the rise time and fall time are 300 μs and 750 μs, respectively. The grating not only has advantages of ordinary VLS grating but also has electric-optic characteristics of PDLC. It has potential applications in the fields of optical fiber communication, photoelectric detection and spectrograph.
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Abstract: Electrically controlled holographic varied-line-spacing (VLS) grating based on polymer dispersed liquid crystal (PDLC) is reported. Varied-line-spacing interference pattern is generated through interference between cylindrical wave and plane wave, and recorded in PDLC. Characteristics, such as spatial frequency, diffraction and electric-optic, are analyzed by experiments. The results show that the trend and range of grating period match well with the theoretical simulation. The relationships between diffraction efficiency and exposure intensity as well as exposure time are studied. The grating diffraction efficiency can be achieved more than 70% with spatial frequency from 530 mm-1 to 650 mm-1. Meanwhile, the grating has good electrically controlled property. The threshold voltage is 2.4 V/μm, and the rise time and fall time are 300 μs and 750 μs, respectively. The grating not only has advantages of ordinary VLS grating but also has electric-optic characteristics of PDLC. It has potential applications in the fields of optical fiber communication, photoelectric detection and spectrograph.
