| Title | Erasable thin-film optical diode based on a photoresponsive liquid crystal polymer |
| Authors | Zhang, Xinping Zhang, Jian Sun, Yujian Yang, Huai Yu, Haifeng |
| Affiliation | Beijing Univ Technol, Inst Informat Photon Technol, Beijing 100124, Peoples R China. Beijing Univ Technol, Coll Appl Sci, Beijing 100124, Peoples R China. Anshan Normal Univ, Anshan 114005, Liaoning, Peoples R China. Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 10083, Peoples R China. Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China. |
| Keywords | ORGANIZED HELICAL SUPERSTRUCTURES CHIRAL MOLECULAR SWITCHES SUBWAVELENGTH HOLE ARRAYS PHOTONIC CRYSTAL LIGHT TRANSMISSION SURFACE METAMATERIALS FILTERS |
| Issue Date | 2014 |
| Publisher | nanoscale |
| Citation | NANOSCALE.2014,6,(7),3854-3860. |
| Abstract | We report a thin-film optical diode written into thin films of a liquid-crystalline polymer (LCP), which is based on the photoinduced LC-to-isotropic phase transition of LCPs. The interference pattern between a collimated and a focused UV laser beam is imprinted as chirped volume-phase gratings in photoresponsive LCP films and no further processing steps like development or liftoff are required for the fabrication. The resultant thin-film device not only possesses the fundamental functions of an optical lens for laser beam focusing, but also shows diode effects with the focusing/defocusing function dependent on the direction of light incidence and orientation of the device. Furthermore, this photonic thin-film lens exhibits a spatially tunable spectroscopic response, revealing a unique physics of secondary excitations of resonance modes of the single-layer LCP waveguide grating structures. This reveals the mechanisms for the focusing/defocusing of laser beams by chirped grating structures. Erasability and reconstructibility of the photoresponsive LCPs guarantee rewritability of the thin-film diode lens. |
| URI | http://hdl.handle.net/20.500.11897/217667 |
| ISSN | 2040-3364 |
| DOI | 10.1039/c3nr06623a |
| Indexed | SCI(E) EI |
| Appears in Collections: | 工学院 |
