| 查看: 1171 | 回复: 6 | |||
| 【奖励】 本帖被评价6次，作者taozhikai增加金币 4.8 个 | |||
[资源]
science最新一篇光子准晶体
|
|||
|
Quasicrystals are aperiodic structures with rotational symmetries forbidden to conventional periodic crystals, examples of which can be found in aluminium alloys, polymers, and even ancient Islamic art. Here, we present direct experimental observation of disorder-enhanced wave transport in quasicrystals, which contrasts directly with the characteristic suppression of transport by disorder. Our experiments are carried out in photonic quasicrystals, where we find that increasing disorder leads to enhanced expansion of the beam propagating through the medium. By further increasing the disorder, we observe that the beam progresses through a regime of diffusive-like transport until it finally transitions to Anderson localization and the suppression of transport. We study this fundamental phenomenon, and elucidate its origins by relating it to the basic properties of quasicrystalline media in the presence of disorder. Anderson localization (1), a fundamental concept in solidstate physics, describes how introducing disorder can transform a conducting crystal into an insulator. This prediction and subsequent experiments have shown that generally disorder works to arrest transport, in periodic systems (crystals) containing disorder (2–4) as well as in fully random potentials (5–9). However, some systems still pose fundamental challenges to this concept, most notably, quasicrystals. Quasicrystals (QCs) (10, 11) constitute an intermediate phase between fully periodic and fully disordered media: they do not have a unit cell and do not exhibit translation symmetry, but nevertheless possess noncrystallographic rotational symmetry, long-range order and display Bragg diffraction. Although many of the properties of QCs are now well understood, some fundamental questions remain. Perhaps one of the most intriguing questions related to QCs has to do with transport. Opposite to crystals containing disorder, which exhibit Anderson localization, it has been suggested that disorder can enhance transport in QCs (12, 13). Indirect experiments indicated that indeed, in some regime, increasing disorder could enhance transport |
回复此楼» 猜你喜欢
求高校合作
已经有1人回复
-
27级无机化学申博自荐
已经有2人回复
-
无机化学论文润色/翻译怎么收费?
已经有78人回复
-
Chemdraw免费软件
已经有0人回复
-
单晶结构解析，各类疑难晶体数据处理和答疑
已经有38人回复
-
这个水相反应有没有催化剂促进发生
已经有4人回复
-
Mn Me3TACN
已经有5人回复
-
求助最新的CCDC数据库升级包
已经有0人回复
-
高中化学教师求助：配合物一水硫酸四氨合铜的紫外可见吸收光谱数据
已经有2人回复
-
ACS omega，返修返回去目前为in peer review，求助进度问题
已经有2人回复
» 本主题相关价值贴推荐，对您同样有帮助:
- 用粒径约1微米的PS微球做光子晶体有什么好方法
已经有21人回复
- 聚合物光子晶体的制备和应用研究取得系列进展（已搜索无重复）
已经有65人回复
- 介电常数对光子晶体光子禁带的影响
已经有8人回复
- 【求助】求懂光子晶体的解答
已经有4人回复
- 【讨论】利用comsol研究光子晶体光纤
已经有47人回复
简单回复
caoge2楼
2011-07-12 10:30
回复
五星好评 顶一下，感谢分享！
2011-10-15 09:07
回复
五星好评 
2012-08-20 23:47
回复
五星好评 顶一下，感谢分享！
2012-08-24 11:17
回复
五星好评 感谢分享！
2016-02-26 14:18
回复
五星好评 顶一下，感谢分享！
韦小妹7楼
2016-03-01 19:54
回复
五星好评 顶一下，感谢分享！
