Multi-gas detection system and method

A Raman multi-gas detection system comprising:

• a single laser;
• an enhancement unit coupled to the laser, wherein the enhancement unit is configured for receiving a gas, wherein the enhancement unit includes a nanogrid having nanogaps, wherein the system is configured to allow gas to flow through the nanogaps of the nanogrid, and wherein the single laser is configured to generate plasmon-enhanced electric fields in at least some of the nanogaps of the nanogrid;
• a detector configured to detect enhanced Raman scattering wherein the gas includes at least two different constituent molecules to be detected and wherein the at least two different constituent molecules in the gas undergo enhanced Raman scattering when in the enhanced plasmon electric fields in the at least some of the nanogaps of the nanogrid;
• and
• an analyzer coupled to the detector wherein the analyzer identifies the at least two different constituent molecules in the gas that generate Raman scattering upon flowing through the at least some of the nanogaps of the nanogrid.

A Raman multi-gas detection system comprising:

• a single laser;
• an enhancement unit coupled to the laser wherein the enhancement unit includes a nanogrid having nanogaps, wherein the single laser is configured to generate plasmon-enhanced electric fields in at least some of the nanogaps of the nanogrid, wherein the system is configured to allow the gas to flow through the nanogaps of the nanogrid such that constituent molecules to be detected in the gas undergo enhanced Raman scattering as the constituent molecules enter the enhanced plasmon electric fields of the at least some of the nanogaps of the nanogrid;
• a detector configured to detect the enhanced Raman scattering;
• and
• an analyzer coupled to the detector wherein the analyzer identifies the constituent molecules in the gas from the enhanced Raman scattering and wherein the gas exiting the nanogrid is configured to be recycled by the system to flow through the nanogaps of nanogrid at least a second time.