Nonlinear Refractory Plasmonics with Titanium Nitride Nanoantennas
Nonlinear Refractory Plasmonics with Titanium Nitride Nanoantennas
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DOI：
10.1021/acs.nanolett.6b02376
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发表时间：
2016-09-01
期刊：
影响因子：
10.8
通讯作者：
Giessen, Harald
中科院分区：
文献类型：
--
作者：
Gui, Lili;Bagheri, Shahin;Giessen, Harald
氮化钛（TiN）是一种新型的耐高温等离子体材料，可以承受高温，并表现出大的光学非线性，潜在地打开大门，为高功率非线性等离子体应用。通过改变天线的长度，我们制备了等离子体共振在950-1050 nm范围内可调的TiN纳米天线阵列。我们提出了二次谐波（SH）光谱的TiN纳米天线阵列，这是分析使用非线性振荡器模型与波长相关的二阶响应从材料本身。此外，对强激光照射下的鲁棒性的表征证实了TiN天线能够承受高达15 GW/cm（2）的高峰强度的激光照射，而不改变它们的光学性质和它们的物理外观。在激光功率可持续性方面，它们的性能超过金天线一个数量级。因此，TiN纳米天线可以作为高功率/高温应用的有前途的候选人，如相干非线性转换器和纳米尺度上的局部热源。
Titanium nitride (TiN) is a novel refractory plasmonic material which can sustain high temperatures and exhibits large optical nonlinearities, potentially opening the door for high-power nonlinear plasmonic applications. We fabricate TiN nanoantenna arrays with plasmonic resonances tunable in the range of about 950-1050 nm by changing the antenna length. We present second-harmonic (SH) spectroscopy of TiN nanoantenna arrays, which is analyzed using a nonlinear oscillator model with a wavelength-dependent second-order response from the material itself. Furthermore, characterization of the robustness upon strong laser illumination confirms that the TiN antennas are able to endure laser irradiation with high peak intensity up to 15 GW/cm(2) without changing their optical properties and their physical appearance. They outperform gold antennas by one order of magnitude regarding laser power sustainability. Thus, TiN nanoantennas could serve as promising candidates for high-power/high-temperature applications such as coherent nonlinear converters and, local heat sources on the nanoscale.