Optical device with propagating and localized surface plasmons and detection apparatus

摘要

An optical device includes a first protrusion group in which protrusions protruding from a conductor surface of a substrate are arranged in a first direction with a first period, a dielectric layer that covers the conductor surface and the first protrusion group, and a second protrusion group in which metal nanoparticles are arranged on the dielectric layer in the first direction with a second period different from the first period. When one of the first period and the second period is defined as Px1, the other of the first period and the second period is defined as Px2, and the wavelength of irradiation light is defined as λ, λ>Px1>Px2 and 0

主权项

1. A detection apparatus comprising:
a light source; an optical device that emits light specific to a sample by introduction of the sample and irradiation with light of a wavelength λ from the light source; and an optical detection unit that detects the light specific to the sample emitted from the optical device, wherein the optical device includes
a first protrusion group in which protrusions protruding from a conductor surface of a substrate are arranged in a first direction with a first period,a dielectric layer that covers the conductor surface and the first protrusion group, anda second protrusion group in which metal nanoparticles are arranged on the dielectric layer in the first direction with a second period different from the first period, and wherein any of a combination in which the first period is Px1 and the second period is Px2 and a combination in which the first period is Px2 and the second period is Px1 satisfies λ>Px1>Px2 and 0