Miyamaru F, Hayashi S, Otani C, Kawase K, Ogawa Y, Yoshida H, Kato E
RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan.
Opt Lett. 2006 Apr 15;31(8):1118-20. doi: 10.1364/ol.31.001118.
A surface-wave sensor based on the resonant transmission characteristics of metal hole arrays is demonstrated in the terahertz (THz) region. Since the frequency of the transmission peak of a metal hole array, which corresponds to the resonant frequency of the surface waves, is particularly sensitive to the refractive index in the vicinity of the metal surface, a very small change in the substances attached to the surface can be detected by monitoring the transmission spectrum. By attaching a layer of substance (thickness t < 5 microm) much thinner than the wavelength of the THz wave (lambda(THz) = 1 mm at 0.3 THz) to the surface of a metal hole array, we demonstrated that the existence of such a small amount of substance can be detected more easily than without the metal hole array. This demonstration of THz sensing with metal hole arrays indicates the possibility of realizing THz surface-wave sensors for biochemical molecules in the THz region.
一种基于金属孔阵列共振传输特性的表面波传感器在太赫兹（THz）波段得到了验证。由于金属孔阵列传输峰的频率对应于表面波的共振频率，该频率对金属表面附近的折射率特别敏感，因此通过监测传输光谱，可以检测到附着在表面的物质的非常微小的变化。通过在金属孔阵列表面附着一层比太赫兹波波长（在0.3太赫兹时，λ(THz)=1毫米）薄得多的物质层（厚度t<5微米），我们证明了与没有金属孔阵列的情况相比，检测如此少量物质的存在更加容易。这种利用金属孔阵列进行太赫兹传感的验证表明，在太赫兹波段实现用于生化分子的太赫兹表面波传感器是有可能的。
