Browsing by Author "Tu, Sheng-Han"

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Demonstration of a simplified optical mouse lighting module by integrating the non-Lambertian LED chip and the free-form surface
(2012-05-20)
Pan, Jui-Wen
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Tu, Sheng-Han
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光電系統研究所
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生醫電子轉譯研究中心
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Institute of Photonic System
A cost-effective, high-throughput, and high-yield method for the efficiency enhancement of an optical mouse lighting module is proposed. We integrated imprinting technology and free-form surface design to obtain a lighting module with high illumination efficiency and uniform intensity distribution. The imprinting technique can increase the light extraction efficiency and modulate the intensity distribution of light-emitting diodes. A modulated light source was utilized to add a compact free-form surface element to create a lighting module with 95% uniformity and 80% optical efficiency. (C) 2012 Optical Society of America
Functional imprinting structures on GaN-based light-emitting diodes for light pattern modulation and light extraction efficiency enhancement
(2010-07-01)
Tu, Sheng-Han
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Wu, Shang-Yen
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Lee, Yeeu-Chang
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Pan, Jui-Wen
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Kuo, Cheng-Huang
In this study, we demonstrated a simple method that can be used to simultaneously modulate the far field pattern and enhance the light extraction of GaN-based light-emitting diodes (LEDs). In this method, microstructures were imprinted on a reliable spin-on-glass surface on top of a transparent conductive layer. The far-field pattern was modulated using microoptical structures, and at the same time, the light extraction was enhanced owing to the small refractive index difference and surface roughness. There was no decrease in the electrical performance of these devices. The peak intensity shifted from 0 to 22A degrees in one-dimensional (1D) asymmetrically blazed periodic structures, and a flattened distribution with a uniform intensity within a span of 110A degrees was observed in two-dimensional (2D) symmetrically periodic structures. This method achieved 13 and 40% light enhancements for 1D and 2D structures, respectively.
Integration of Imprinting with Reflector for Designing High Efficiency Street-Lamp Module
(2010)
Pan, Jui-Wen
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Tu, Sheng-Han
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Fan, Chen-Wei
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Lin, Sheng-Han
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Huang, Jiun-Yang
A cost effective, high throughput, and high yield method for street lamp was proposed in this paper. We integrated the imprinting technology and the reflective optical element to improve the conventional street lamp. The novel design has 40% enhancement in illumination intensity, the uniform illumination and the glare effect elimination.
Integration of Non-Lambertian LED and Reflective Optical Element as Efficient Street Lamp
(2010-06-21)
Pan, Jui-Wen
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Tu, Sheng-Han
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Sun, Wen-Shing
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Wang, Chih-Ming
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Chang, Jenq-Yang
A cost effictive, high throughput, and high yield method for the increase of street lamp potency was proposed in this paper. We integrated the imprinting technology and the reflective optical element to obtain a street lamp with high illumination efficiency and without glare effect. The imprinting technique can increase the light extraction efficiency and modulate the intensity distribution in the chip level. The non-Lambertian light source was achieved by using imprinting technique. The compact reflective optical element was added to efficiently suppress the emitting light intensity with small emitting angle for the uniform of illumination intensity and excluded the light with high emitting angle for the prevention of glare. Compared to the conventional street lamp, the novel design has 40% enhancement in illumination intensity, the uniform illumination and the glare effect elimination. (C) 2010 Optical Society of America
Optical properties of light emitting diodes with a cascading plasmonic grating
(2010-12-06)
Wang, Chih-Ming
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Tsai, Yao-Lin
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Tu, Sheng-Han
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Lee, Chien-Chieh
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Kuo, Cheng-Huang
In this paper, the polarization dependent optical properties of InGaN/GaN multi-quantum wells (MQWs) LED with cascading plasmonic gratings are investigated using an angle-resolved photoluminescence (ARPL) spectrometer. The plasmonic gratings consist of two Ag gratings with a half-pitch displacement. The ARPL spectra of the TE-TM state present a broadband emission with resonance dips occasioned by the SP resonance while the TM-TE state presents resonance peaks with low sideband emission. The resonance properties can be tuned by modifying the geometric parameters of the plasmonic grating. The ARPL spectrum of the LED sample with pure GaN 1D grating is also measured and discussed. The investigated plasmonics LED represents resonance optical properties different from the conventional surface relief LED, which can be used in special applications. (C) 2010 Optical Society of America