权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Photonic Crystals for Radiation-Field Control

用于辐射场控制的光子晶体的开发

基本信息

批准号：
10559001
负责人：
INOUE Kuon
金额：
$ 8.32万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10559001/
关键词：
Photonic Crystal Photonic Bandgap Control of Radiation Field Photonic Band Structure Nano-Technology Light-Matter-Interaction Light Waveguide Group Velocity 光の伝播特性

项目摘要

1. We have successfully fabricated three-types of two-dimensional (2D) photonic-crystal slabs or quasi-three dimensional ones from Al_xGa_<1-x> As by using the state-of-art semiconductor micro-machining technique. Then, we have charified optical responses of those samples, such as the transmittance spectrum and reflectance at specific wavelengths observed using a femtosecond light pulse. Thus, we have characterized, from the vewpoint of controlling the radiation field and light propagation, those samples with the help of the corresponding photonic band-structure calculated.(1) Optical-waveguide slab perforated periodically down to midway the lower cladding-layer ; it is clarifed that although no guided modes exist, the samples with an air-filling factor smaller than 0.3 and the number of air-hole's row smaller than 10 should work for the above purpose.(2) Air-bridge slab without any cladding-layer ; it is found that the guided modes exist, where the transmittance is almost 100%, and that this type of sample is superior.(3) Slab with the lower cladding-layer oxidized for reducing the refractive index ; this type of sample is also found to be good, since the guided modes exist in a limited energy region.2. We have experimentally demonstrated a few novel aspects of interaction between matter and light in a photonic crystal, by utilizing either a slab sample described above or a 2D capillary-type of air-rod crystal made of PbO fibers.(1) We have developed a 2D photonio-crystal laser, which is based on a small group-velocity(2) We have shown in the second-harmonic generation phenomenon that a phase-matching condition is easily fulfilled with use of a unique photonic band-structure, and that the signal is enhanced due to a small group-velocity.(3) By observing propagation time of a femtosecond light pulse through a photonic crystal, we have for the first time clarified that the group-velocity becomes smaller by almost two orders of magnitude than that in vacuum.

1. 我们利用最先进的半导体微加工技术，成功地以Al_xGa_<1-x> As为原料制备了三种类型的二维（2D）光子晶体板或准三维光子晶体板。然后，我们记录了这些样品的光学响应，例如使用飞秒光脉冲观察到的特定波长的透射光谱和反射率。因此，我们从控制辐射场和光传播的角度出发，借助计算出的相应的光子能带结构对这些样品进行了表征。(1)光波导板周期性地穿孔至下包层的中间；明确了虽然不存在导模，但空气填充系数小于0.3、气孔排数小于10的样品也能达到上述目的。(2)无包覆层的空气桥板；发现导模存在，透过率接近100%，表明该类样品较优。(3)板坯下包层氧化降低折射率；这种类型的样品也被发现是好的，因为导模存在于有限的能量区域中。2．我们通过利用上述平板样品或由 PbO 纤维制成的二维毛细管型空气棒晶体，通过实验证明了光子晶体中物质与光之间相互作用的一些新颖方面。（1）我们开发了一种基于小群速度的二维光子晶体激光器（2）我们在二次谐波产生现象中证明了相位匹配条件为利用独特的光子能带结构很容易实现这一点，并且由于群速度小，信号得到增强。(3)通过观察飞秒光脉冲通过光子晶体的传播时间，我们首次阐明群速度比真空中小了近两个数量级。