Lee Jaehak, Sung Sangkeun, Choi Jun-Hyuk, Eom Seok Chan, Mortensen N Asger, Shin Jung H
Korea Advanced Institute of Science and Technology, Department of Physics, 373-1 Guseong-dong, Yuseong-Gu, Daejeon, South Korea.
Korea Institute of Machinery &Materials, 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon, South Korea.
Sci Rep. 2016 Feb 29;6:22305. doi: 10.1038/srep22305.
Arrays of sub-wavelength, sub-10 nm air-gap plasmonic ring resonators are fabricated using nanoimprinting. In near infra-red (NIR) range, the resonator supports a single dipole mode which is excited and identified via simple normal illumination and explored through transmission measurements. By controlling both lateral and vertical confinement via a metal edge, the mode volume is successfully reduced down to 1.3 × 10(-5) λ0(3). The advantage of such mode confinement is demonstrated by applying the resonators biosensing. Using bovine serum albumin (BSA) molecules, a dramatic enhancement of surface sensitivity up to 69 nm/nm is achieved as the modal height approaches the thickness of the adsorbed molecule layers.
利用纳米压印技术制备了亚波长、小于10纳米气隙的等离子体环形谐振器阵列。在近红外（NIR）范围内，该谐振器支持单偶极子模式，通过简单的垂直照明激发并识别该模式，并通过透射测量进行研究。通过金属边缘控制横向和纵向限制，模式体积成功减小至1.3×10^(-5)λ0(3)。通过将谐振器应用于生物传感，证明了这种模式限制的优势。使用牛血清白蛋白（BSA）分子，当模式高度接近吸附分子层的厚度时，表面灵敏度显著提高，达到69纳米/纳米。
