| 摘要 |
Apparatus and method for examining the identity of chemical groups in a sample (82) are disclosed. The apparatus (35) has a substrate (80) having a plasmon resonant surface on which the sample (82) is supported, a source of a beam of light (10), and a lens assembly (60) having a tip region and a nanolens (62) composed of one or more plasmon resonance particles (PRPs) on the tip region. The PRPs are arranged to produce near-field electromagnetic gap modes in a space between the nanolens (62) and a confronting detection region on the substrate surface (80) when the gap between the nanolens (62) and the substrate (80) is 30 nm or less. A focusing mechanism in the apparatus operates to move the lens assembly (60) toward and away from the substrate surface (80), with a gap of less than 30 nm, to produce electromagnetic gap modes that enhance the Raman spectroscopy signals produced by the sample (82) in the detection region.
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