Metal nano-void photonic crystal for enhanced raman spectroscopy
First Claim
1. A planar optical platform for generating a Raman signal from a foreign object, comprising:
- an input region for receiving optical radiation;
a plasmonic band structure region optically coupled to the input region, the plasmonic band structure region comprising a layer of a first material patterned with an array of sub-regions of a second material, the first material having a first refractive index and the second material having a second refractive index, a side-wall of each sub-region being coated with a metallic or metallodielectric layer, wherein the array of sub-regions give rise to a plasmonic band structure, and wherein, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region; and
an output region for extracting optical radiation, the output region optically coupled to the plasmonic band structure region.
3 Assignments
0 Petitions
Accused Products
Abstract
A planar optical platform for generating a Raman signal from a foreign object comprises an input region and an output region, for receiving and extracting optical radiation, optically coupled to a plasmonic band structure region. The plasmonic band structure region comprises a layer of a first material, having a first refractive index, patterned with an array of sub-regions of a second material, having a second refractive index, wherein a side-wall of each sub-region is coated with a metallodielectric layer. The array of sub-regions gives rise to a plasmonic band structure and, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region, which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region. The platform may be incorporated into a spectroscopic measurement system and is particularly useful for surface-enhanced Raman spectroscopy of analyte molecules.
-
Citations
39 Claims
-
1. A planar optical platform for generating a Raman signal from a foreign object, comprising:
-
an input region for receiving optical radiation;
a plasmonic band structure region optically coupled to the input region, the plasmonic band structure region comprising a layer of a first material patterned with an array of sub-regions of a second material, the first material having a first refractive index and the second material having a second refractive index, a side-wall of each sub-region being coated with a metallic or metallodielectric layer, wherein the array of sub-regions give rise to a plasmonic band structure, and wherein, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region; and
an output region for extracting optical radiation, the output region optically coupled to the plasmonic band structure region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 31, 32, 33, 34, 35, 36, 37, 38, 39)
-
-
26. An optical system for performing Raman spectroscopy on a foreign object comprising;
-
an optical source;
an optical platform for generating a Raman signal from a foreign object, comprising;
an input region for receiving optical radiation, a plasmonic band structure region optically coupled to the input region, the plasmonic band structure region comprising a layer of a first material patterned with an array of sub-regions of a second material, the first material having a first refractive index and the second material having a second refractive index, a side-wall of each sub-region being coated with a metallic or metallodielectric layer, wherein the array of sub-regions give rise to a plasmonic band structure, and wherein, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region, and an output region for extracting optical radiation, the output region optically coupled to the plasmonic band structure region, the optical platform optically coupled to the optical source; and
an optical detector optically coupled to the optical platform for detecting a Raman signal generated when the foreign object is placed proximate the plasmonic band structure region into which radiation from the optical source is coupled.
-
-
27. A method for obtaining a Raman or surface enhanced Raman spectrum from a sample foreign object, the method comprising the steps of:
-
locating the sample foreign object proximate the plasmonic band structure region of an optical platform, wherein the platform comprises an input region for receiving optical radiation, a plasmonic band structure region optically coupled to the input region, the plasmonic band structure region comprising a layer of a first material patterned with an array of sub-regions of a second material, the first material having a first refractive index and the second material having a second refractive index, a side-wall of each sub-region being coated with a metallic or metallodielectric layer, wherein the array of sub-regions give rise to a plasmonic band structure, and wherein, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region, and an output region for extracting optical radiation, the output region optically coupled to the plasmonic band structure region, the optical platform optically coupled to the optical source;
activating an optical source generating optical radiation optimised for excitation of surface plasmons, an optimised parameter for said radiation selected from a group which includes wavelength, azimuthal and polar angles, and polarization state;
coupling the optical radiation into the plasmonic band structure region; and
,detecting a spectrum of a Raman signal emerging from the optical platform - View Dependent Claims (28, 29, 30)
-
Specification