贺！本所特聘讲座厉鼎毅院士荣获 「IEEE最高荣誉金奖」～

国际电机电子工程学会（IEEE）日前颁发最高荣誉金奖予本所特聘讲座厉鼎毅院士，以表彰厉院士于光纤通讯上的卓越贡献，特此恭贺！相关报导可参见下列网页。

Prof. Roel Baets于2009年8月26日（星期三）莅临本所访问，并于电机二馆105演讲厅发表演说，讲题为「Silicon Photonics: Opportunities and Challenges」，本所教师及学生皆热烈参与演讲活动，获益良多。

【作品名称】夏之雪
【参赛作者】白益豪   程志贤   吴仲伦

【作品说明】

艺术性：
珊瑚是群居性的无脊椎动物，牠主要是用「卵海战术」来孕育新的生命，又被称为夏之雪。

实物说明：
本创作是以电化学混成技术法合成奈米银结构并透过穿透式电子显微镜在暗视野模式下所拍摄的微观影像图。

Miniature optical autofocus camera by micromachined fluoropolymer deformable mirror

Professor Guo-Dung Su

Graduate Institute of Photonics and Optoelectronics, National Taiwan University

台湾大学光电所 苏国栋教授

Along with the progress of image sensors in recent years, fix-focus cameras on mobile electronic devices do not fulfill consumer needs. With the size of mobile devices getting smaller and smaller, the displacement-to-thickness ratio is getting larger, and that makes mechanical motor systems difficult to be packaged inside cameras to achieve autofocus function.

We propose a design using micromachined fluoropolymer deformable mirrors rather than traditional mechanical motor. With low color dispersion and adjustable power range of 20-diopter, deformable mirrors can be integrated into optical module and are well suitable for miniature optical auto-focus camera. A polymer membrane works as a reflective mirror surface to focus the light variably by adjusting the voltage difference. Fig. 1 shows a schematic drawing and photograph of the fabricated device.

We conducted an experiment between optical power versus applied voltage. The polymer membrane was actuated by the electrostatic force and deformation of the polymer membrane can be adjusted by changing voltage difference continuously. The optical power and deformation versus the applied voltage is plotted in Fig. 2. The maximum optical power achieved is around 20-diopter when 160 volts is applied, corresponding to 27-μm deformation at the center of the membrane. The optical power of an organic deformable mirror could be adjusted continuously.

At the beginning, when the mirror was not actuated, the far object (the train) with “HARIBO” can be seen clearly while the near object, the name card with “Jen-Liang Wang”, is blurred as show in Fig. 3(a).  After applying voltage to the deformable mirror, the effective focal length of the system changes. The focal point moves forward so that the near object can be clearly seen. We can see that there are still some aberrations at the edge of the images. This can be fixed by custom-designing the lenses.  We demonstrate that the deformable mirror is feasible as vari-focus devices in camera lens module without moving component. This part is also shown in the video file submitted.

White Organic Light-Emitting Devices with Low Driving Voltage and High Efficiency

Professor Jiun-Haw Lee

Graduate Institute of Photonics and Optoelectronics, National Taiwan University

台湾大学光电所 李君浩教授

By selectively doping yellow emitter in the ambipolar blue emitting layer (EML), white light organic light-emitting device (OLED) could be obtained and the driving voltage was reduced due to the recombination current increase. We doped rubrene near the maximum recombination zone of our OLED, 4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl doped in 9,10-bis(2’-naphthyl) anthracene (DPAVBi:ADN), 2V reduction in driving voltage was achieved. Although electron and hole mobilities of ADN are comparable, we found the recombination zone is near the interface of hole-transport layer (HTL) and EML interface the injection barrier for the hole is higher than that for the electron.

低反射有机发光二极管组件中的设计与应用，此低反射组件同时具有高吸收特性与破坏性干涉的共振腔结构，利用共振腔结构中填充的高吸收与高导电度有机吸收材料。介电层的材料是利用银粒子掺杂有机材料MPPDI而来。有机材料吸收的增强与导电性的增加主要分别来自奈米银粒子的掺杂所造成的表面电浆共振所引发的吸收增强与银本身电性较佳的结果。未做表面抗反射处理的低反射有机发光二极管组件所导致的反射超低大约只有4% (见图一)，这个值很接近空气与玻璃界面的反射；在人眼最敏感的波长550 nm部份，也只有5.5%。此组件在广视角的影像表现很好(见图二)，反射率也很低，在斜视角60^o时有反射率12.3％在550 nm，因此有利于当成手持显示装置在户外使用。

图一、液态OLED组件结构图

图二、外部量子效率不高，需要再优化