Temperature dependent refractive index of DNA-cetyltrimethylammonium chloride (CTMA) thin-solid-film was measured 20 to 90℃ to obtain its thermo-optic coefficient of -3.6×10-4 (dn/dT). DNA- CTMA film has high thermosoptic coefficient than other polymers. The film was deposited on coreless silica fiber (CSF) to serve as a multimode interferometer optical fiber temperature sensor. It is immersed in a water that changed temperature from 40 to 90℃. It has sensitivity of 0.25nm/℃.
Thin films of DNA biopolymer thin film are fabricated by a drop casting process on glass and silicon substrates, as well as freestanding. The refractive index is measured by elliposmetry and in bulk DNA film the refractive index is shown to be increased in the 600 to 900 nm DNA transparency window by doping with riboflavin. Further analysis with FT-IR, Raman, and XRD are used to determine whether binding between riboflavin and DNA occurs.
Deoxyribonucleic acid (DNA) has been a remarkable material in the development of optoelectronic devices for granted these days. In this research, we report on an optical phenomenon of DNA structures grown by a self-assembly process. Discrete 2D nanocrystal structures of DNA were prepared on a light-guiding substrate. The high evanescent field interaction between the guided light supplied via D-shaped optical fiber and DNA monolayers enabled the systematic investigating of the optical properties of DNA nanocrystal structures. In particular, light guided down the fiber and received by an optical spectrum analyzer enabled spectral analysis, while morphology studies of the self-assembly DNA were performed by atomic force microscopy.
In the development of optoelectronic devices, deoxyribonucleic acid has been a representative material which has received much recent attention as a promising research area. We constructed waveguide based on optical fiber components and polydimethylsiloxane (PDMS) channel with discrete two dimensional nano-scale DNA monolayers grown by a self-assembly process and DNA complexes with cetyltrimethylammonium (DNA-CTMA) based on different kinds of solution; butanol, ethanol, and hexafluoroisopropanol. We measured the spectral profile of waveguides using a near-infrared laser source. We expect that biomaterials such as DNA-lipid complexes will have a unique application in optical devices compared with traditional fossil fuel-based polymers.
We present spectral analyses of an optical fiber waveguide containing a DNA-based solution as the optical core material, as well as separately derived optical dispersion curves for several candidate solutions. Using an Abbe refractometer and a supercontinuum light source, the visible refractive indexes of DNA-toluene, DNA-CTMA-butanol, DNA-CTMAethanol, and DNA-CTMA-HFIP solutions are measured at several concentrations and several wavelengths. The optimal solutions for light guiding are injected into hollow optical fiber waveguides, and the transmission spectra are measured by optical spectrum analyzer.
Photoluminescence is one of the methods used for analyzing the optical characteristics of materials. For components
in solid-state lighting such as GaN-based LEDs, the use of an LED structure configuration on a patterned sapphire
substrate has shown to be highly effective in improving light-extraction efficiency. We proposed a compact and simple
photoluminescence measurement system based on fiber-optic probes that can be scanned over a 20 × 20 μm2 area with a
high spatial resolution. We applied the system in morphological study of InGaN/GaN epitaxial layers for LED
applications. With this system, we obtained peak intensity, peak wavelength, and full width at half maximum of the