Konopsky Valery N, Alieva Elena V
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow region, 142190,
Opt Lett. 2009 Feb 15;34(4):479-81. doi: 10.1364/ol.34.000479.
A one-dimensional (1D) photonic crystal structure with a terminal palladium layer supporting long-range surface plasmon polariton (LRSPP) waves in any gaseous environment is described. We show that LRSPP propagation may be achieved not only along "good plasmonic" metals such as Ag and Au but also along lossy metals such as Pd, which does not usually support plasmon propagation in the visible spectral range with ordinary Kretschmann excitation. The possibility of the LRSPP propagation along catalytically active metals such as Pd or Pt opens up new perspectives for studying of (photo)chemical surface reactions and offers the potential for more applications in the general area of catalysis, photocatalysis, and plasmon-mediated chemistry. We present experimental results that demonstrate the hydrogen sensitivity of this photonic structure incorporating a catalytically active 8-nm-thick Pd final layer. A 3% hydrogen concentration in nitrogen is detected with a signal-to-noise ratio of approximately 300, with a response time of about 10 s at room temperature.
描述了一种一维（1D）光子晶体结构，其具有终端钯层，可在任何气体环境中支持长程表面等离激元极化激元（LRSPP）波。我们表明，LRSPP传播不仅可以沿着诸如Ag和Au等“良好的等离子体”金属实现，而且还可以沿着诸如Pd等有损金属实现，而在普通的Kretschmann激发下，Pd在可见光谱范围内通常不支持等离子体传播。沿着诸如Pd或Pt等催化活性金属进行LRSPP传播的可能性为研究（光）化学表面反应开辟了新的前景，并为催化、光催化和等离子体介导化学等一般领域的更多应用提供了潜力。我们展示了实验结果，这些结果证明了这种包含催化活性8纳米厚Pd终端层的光子结构对氢气的敏感性。在室温下，检测到氮气中3%的氢气浓度，信噪比约为300，响应时间约为10秒。
