NON-CONTACT OPTICAL EXTENSION SENSOR FOR MEASURING MODIFICATIONS IN THE PARTICLE PLASMON RESONANCE

摘要

The invention relates to a method for the non-contact measurement of variations in the extension of a test body (1,14) applied to an object (15), especially variations of the test body (1,14) in the sub-micrometer range between 10 nm and 500 nm, said test body (1,14) being subjected to primary radiation from an emitter (12), especially a light source. According to the invention, the primary radiation modified by means of the test body (1,14) is received by a receiver (13) as secondary radiation, the variation in the extension being determined from the degree of the modification. The variation in the modified primary radiation is observed when there are variations in the extension. The modification is caused by an excitation of plasmons in the test body (1,14), and the plasmons are excited in nanoparticles (particle plasmons) located on the surface of the test body (1,14).