Wang Yao Ting, Cheng Bo Han, Ho You Zhe, Lan Yung-Chiang, Luan Pi-Gang, Tsai Din Ping
Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
Opt Express. 2012 Sep 24;20(20):22953-60. doi: 10.1364/OE.20.022953.
We propose an innovative active imaging device named gain-assisted hybrid-superlens hyperlens and examine its resolving power theoretically. This semi-cylindrical device consists of a core of semi-cylindrical super-lens and a half cylindrical outer shell of hyperlens. Both the superlens and hyperlens parts of the device are appropriately designed multi-layered metal-dielectric structures having indefinite eigenvalues of dielectric tensors. The dielectric layers of the hyperlens are doped with Coumarin, which play the role of gain medium. The gain medium is analyzed thoroughly using a generic four-level system model, and the permittivity of the gain medium is extracted from this analysis for simulating the imaging characteristics of the device. According to our simulation at wavelength of 365 nm, an excellent resolution power much better than the diffraction limit value can be achieved.
我们提出了一种名为增益辅助混合超透镜的创新型有源成像设备，并从理论上研究了其分辨能力。这种半圆柱形设备由一个半圆柱形超透镜芯和一个半圆柱形超透镜外壳组成。该设备的超透镜和超透镜部分均为经过适当设计的多层金属 - 电介质结构，其介电张量具有不确定的本征值。超透镜的电介质层掺杂有香豆素，香豆素起到增益介质的作用。使用通用的四能级系统模型对增益介质进行了全面分析，并从该分析中提取了增益介质的介电常数，以模拟该设备的成像特性。根据我们在365nm波长下的模拟，可实现远优于衍射极限值的出色分辨能力。
