Laboratoire de Photonique et de Nanostructures (LPN-CNRS) Route de Nozay, 91460 Marcoussis, France.
Nano Lett. 2011 Sep 14;11(9):3557-63. doi: 10.1021/nl201004c. Epub 2011 Aug 17.
Arrays of plasmonic nanocavities with very low volumes, down to λ(3)/1000, have been fabricated by soft UV nanoimprint lithography. Nearly perfect omnidirectional absorption (3-70°) is demonstrated for the fundamental mode of the cavity (λ ≃ 1.15 μm). The second-order mode exhibits a sharper resonance with strong angular dependence and total optical absorption when the critical coupling condition is fulfilled (45-50°, λ ≃ 750 nm). It leads to high refractive index sensitivity (405 nm/RIU) and figure of merit (∼21) and offers new perspectives for efficient biosensing experiments in ultralow volumes.
通过软紫外纳米压印光刻技术，制造出体积非常小、低至 λ(3)/1000 的等离激元纳米腔阵列。对于腔的基本模式（λ ≃ 1.15 μm），展示了近乎完美的全向吸收（3-70°）。当满足临界耦合条件（45-50°，λ ≃ 750nm）时，二阶模式表现出更尖锐的共振，具有强烈的角度依赖性和全光吸收。这导致了高折射率灵敏度（405nm/RIU）和品质因数（∼21），为超小体积的高效生物传感实验提供了新的前景。
