Nano-grating structures for application of 3D display system
Date Issued
2014
Date
2014
Author(s)
Lin, Ming-Yi
Abstract
The thesis explores various polarized emitting light source in polarized 3D system application by utilizing nano-grating structures. The temperature stability of the metal nano-grating structures is high, such that it is suitable for the modern display system. The nano-grating structures are fabricated by laser interference lithography, e-beam lithography and nano-imprint process, respectively. According to different fabrication processes, the samples are designed to function as a polarizer or a quarter wave plate. Moreover, nano-structure also works as a transparent electrode, which can be used in solar cell or polarized organic light emitting diode (OLED) devices. The thesis is divided into four primary tasks: linearly polarized OLED for 3D system, circularly polarized OLED for 3D system, nano-grating structure for transparent electrode and the image quality of 3D system based on nano-grating structures.
First, the metal nano-grating structures prepared by various fabrication processes are designed to function as a polarization selector to allow transmission for transverse magnetic (TM) wave and reflect transverse electric (TE) wave in the wavelength range of 400-700 nm. The transmission spectra and polarization characteristics of the designed sample are simulated by rigorous coupled wave analysis (RCWA) method to ensure the high polarization ratio of the emission light. By applying this technology to OLEDs, we successfully fabricated a green and a white light OLED with linearly polarized emission. The polarization ratio can reach around 90%.
Second, a simple method to measure the phase difference between two optical axis and the ellipticity of the circularly polarized light is demonstrated. The nano-grating structures working as the phase retarder are designed for narrow wavelength band, and then fabricated. The polarized characteristics of transmitted light are estimated theoretically and experimentally. The ellipticity of circularly polarized emission for all samples can reach around 90% and the cross-talk of those of samples are smaller than 7%. In addition, the metal grating quarter wave plate operating in the wavelength range of 400–700 nm is also designed and fabricated. It can simplify the fabrication of 3D system as the sample can function as a phase retarder in visible wavelength range. The nano-grating sample is further combined with linearly polarized OLED to form a circularly polarized OLED.
Third, the embedded grating structure is used to protect the grating from damage, and simultaneously function as the polarizing filter and the transparent electrode. The OLED with embedded structure can exhibit highly polarized emission and high efficiency, which has great potential in the future 3D display industries. On the other hand, for the application of the solar cell, the nano-grating transparent electrode is used to enhance the field intensities in the active layer and increase the absorption of the active layer. The TM wave can generate the surface plasmon polariton (SPP) mode, and the TE wave can excite the wave guide mode at the active layer. The power conversion efficiency of the plasmonic ITO-free polymer solar cell can reach as high as 3.64%.
Fourth, in terms of previous tasks, the images of the polarized 3D display system are simulated to understand the relation between the image quality and cross-talk. In addition, the optical components are also arranged to simulate the real 3D system. To observe the uniformity of the images, we not only measure the brightness of the images by luminous-meter but also take the photography. The nano-grating quarter wave plate shows a great potential in the application of polarized 3D laser projector system.
Subjects
3D立體顯示系統
奈米光柵結構
極化出光OLED
偏光片
相位延遲片
嵌入式結構
非使用銦錫氧化物
太陽能電池
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-103-D99941004-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):6b4c9e8c40a68f57f68fddbf96a4b3f6