期刊
OPTICS EXPRESS
卷 22, 期 24, 页码 29479-29492出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.029479
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- National Science Council of Taiwan [MOST 103-2112-M-006-012-MY3]
- Advanced Optoelectronic Technology Center, National Cheng Kung University, under the Top University Project from the Ministry of Education
This study demonstrates for the first time a continuously tunable photonic bandgap (PBG) of wide spectral range based on a blue phase (BP) wedge cell. A continuously shifting PBG of the BP wedge cell occurs due to the thickness gradient of the wedge cell at a fixed temperature. The wedge cell provides a gradient of boundary force on the LCs and thus forms a distribution of BP crystal structure with a gradient lattice. Additionally, a spatially tunable lasing emission based on a dye-doped BP (DDBP) wedge cell is also demonstrated. The tunable band of the PBG and lasing emission is about 130 nm and 70 nm, respectively, which tuning spectral ranges are significantly wider than those of CLC and DDCLC wedge cells, respectively. Such a BP device has a significant potential in applications of tunable photonic devices and displays. (C) 2014 Optical Society of America
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