Recent research results on DNA-lipid complexes have shown various attractive features on E/O or O/E devices, optical memories, switches and sensors by intercalating optical dye into DNA double helix. Physical properties of DN-lipid complexes are greatly dependent on kinds of lipids and chiral lipids from α-amino acids were prepared so that self-assembled structure of DNA molecules was organized. DNA-L-alanine-derived lipid formed a self-assembled film with a liquid crystalline structure, which showed a less water absorption. DNA devices absorbed water under high humidity which led to decreases of optical functions. However, it was possible to encapsulate the DNA-lipid complexes into sol-gel materials so that a water permeation was prevented by glass to stabilize and to keep the optical functions for a long time.
We observed optical properties of organic fluorescence materials doped DNA-CTMA and PMMA. The quantum yield in DNA-CTMA was higher than in PMMA. Amplified spontaneous emission properties of dye-doped DNA-CTMA film at ambient temperature were investigated. The narrowing of line shape and amplified spontaneous emission dependence occur at the same intensity indicates that both effects are the results of light amplification. We discussed the lasing capability by interacting DNA-CTMA.
DNA fibers were prepared by melt spinning method from DNA-CTMA powder. A hemicyanine dye, trans-4-{4-(dibutylamino)-styryl}-1-methylpyridinium iodide (DBASMPI) doped DNA-CTMA fiber with core diameter of 1 mm and dye concentration of 3.6 wt% was obtained by soaking it in an aqueous dye solution. Laser (532 nm) pumped amplified spontaneous emission (ASE) at 610 nm was observed in the dye-doped DNA-CTMA fiber. The ASE occurred at energy density 50 mW. The amplification of optical signals at 607 nm wavelength was confirmed. The results from ASE emphasize that DBASMPI doped DNA-CTMA fiber is appealing as a good candidate for optical amplifiers and superfluorescence sources in a variety of communication and sensor applications.
Various DNA-cationic lipid complexes and their bulk films were prepared and their physical properties were measured. Consequently, it was found that physical properties were greatly dependent on each lipids. The DNA-lipid complexes film formed by C-12 lipid of single-chain trimethylammonium type showed largest value on mechanical strength. Water absorption behaviors of the films were also dependent on kinds of lipids. It was found that fluorescence quantum yields of cyanine doped DNA-lipid films decreased nonlinearly with increasing relative humidity, while the fluorescence quantum yields were high compared with that of PMMA in whole range of relative humidity.
We observed optical properties from several kinds of Eu-chelates doped DNA-CTMA and PMMA films. The lifetime in DNA-CTMA was longer than in PMMA, and the quantum yield in DNA-CTMA was also higher than in PMMA. Among them, we calculated each cross section because we compared laser properties of Eu-chelates by interacting DNA-CTMA with PMMA. We will discuss the lasing capability by interacting DNA-CTMA.
A DNA-CTMA optical fiber was prepared by melt-spinning method for the first time. A hemicyanine dye, trans-4-(4-dibutylamino)-styryl)-1-methylpyridinium iodide (DBASMPI) doped DNA-CTMA fiber with core diameter of 1 mm and dye concentration of 3.6 wt% was obtained by soaking it in an aqueous dye solution. Laser (532 nm) pumped amplified spontaneous emission (ASE) at 610 nm was observed in the dye-doped DNA-CTMA fiber. The ASE occured at energy density 50 mW. The results from ASE emphasize that DBASMPI doped DNA-CTMA fiber is appealing as a good candidate for optical amplifiers and superfluorescence sources in a variety of communication and sensor applications.
A polythiophene-doped polymethylacrylate which have absorbance in visible region was synthesized by plasma polymerization, and its fluorescence spectra was studied. The absorption peak was 440nm, the fluorescence emission of spectra was 570nm. The intensity of the fluorescence emission of the polymer was higher than that of the polymer synthesized by radical polymerization. It is reasonable to suppose that chemical reaction of plasma polymerization was mild compared with radical polymerization.
We propose a novel method to design the shape of small elastic robots made entirely of electroactive polymer (EAP) gel. The gel operates as actuators in microsystems and can facilitate bending motions. In this paper, we bring out directional deformation from originally bending type polymer driven by electric fields. The key idea is to partially reduce the structural flexibility through shape design. To achieve directional motion, we designed gels with wave-shaped surfaces. The thick parts and thin parts of the surface are distributed in either one or two directions. We developed a mollusk type gel robot which shows bi-directional motion. In this way, we propose the method to design the desired deformation response by shape design of the material in advance. This technique is especially suited for MEMS consisting of soft materials.
The polymeric cross-linked hydrogel doped with dye 4- nitroaniline was prepared. The nonlinear optical properties of this material has been studied. The optical storage effects and the dynamic lens effects in this dye doped hydrogel under laser radiation have been observed. It is reasonable to show that this dye doped polymer get will find some applications in optical signal processing.
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