Photonic quasi-crystal terahertz lasers.
Photonic quasi-crystal terahertz lasers.
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DOI：
10.1038/ncomms6884
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发表时间：
2014-12-19
影响因子：
16.6
通讯作者：
Davies, A. Giles
中科院分区：
文献类型：
--
作者：
Vitiello, Miriam Serena;Nobile, Michele;Ronzani, Alberto;Tredicucci, Alessandro;Castellano, Fabrizio;Talora, Valerio;Li, Lianhe;Linfield, Edmund H.;Davies, A. Giles
准晶体结构并不呈现完整的空间周期性，但仍然是从确定性的生成规则开始构建的。当由不同的介电材料制成时，它们通常具有迷人的光学性质，介于周期性光子晶体和散射体随机排列的光学性质之间。事实上，它们可以在能谱中支持具有伪隙的扩展带状态，但缺乏平移不变性，它们还本质上具有“缺陷”模式，这可以引起限制在空间中的临界局域模，类似于随机结构中的Anderson模。如果用作激光谐振器，光子准晶体开启了在传统周期光子晶体中根本不可能实现的设计可能性。在这封信中，我们利用了电注入激光器中的二维光子准晶体的概念；具体地说，我们在太赫兹量子级联激光器的顶面上设计了具有五角形旋转对称性的PenRose瓷砖，由于丰富的准晶体傅里叶谱，获得了0.1%-0.2%的壁塞效率和65 mW的峰值输出功率和特征表面发射锥形光束。最近已经提出了各种垂直表面发射的太赫兹量子级联激光器，但这些激光器存在远场功率抵消和提取效率有限的问题。在这里，Vitiello等人。使用二维光子准晶体谐振器绕过这些问题。
Quasi-crystal structures do not present a full spatial periodicity but are nevertheless constructed starting from deterministic generation rules. When made of different dielectric materials, they often possess fascinating optical properties, which lie between those of periodic photonic crystals and those of a random arrangement of scatterers. Indeed, they can support extended band-like states with pseudogaps in the energy spectrum, but lacking translational invariance, they also intrinsically feature a pattern of ‘defects’, which can give rise to critically localized modes confined in space, similar to Anderson modes in random structures. If used as laser resonators, photonic quasi-crystals open up design possibilities that are simply not possible in a conventional periodic photonic crystal. In this letter, we exploit the concept of a 2D photonic quasi crystal in an electrically injected laser; specifically, we pattern the top surface of a terahertz quantum-cascade laser with a Penrose tiling of pentagonal rotational symmetry, reaching 0.1–0.2% wall-plug efficiencies and 65 mW peak output powers with characteristic surface-emitting conical beam profiles, result of the rich quasi-crystal Fourier spectrum. Various vertical surface emitting, terahertz quantum-cascade lasers have been proposed recently but these suffer from power cancellations in the far-field and limited extraction efficiencies. Here, Vitiello et al. circumvent these issues using two-dimensional photonic quasi-crystalline resonators.
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影响因子：
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