Light localization has transformative implications for advancing the fields of chemistry and physics,enabling new approaches in sensing,imaging,energy harvesting,photochemical catalysis,molecular-scale optoelectronic ...Light localization has transformative implications for advancing the fields of chemistry and physics,enabling new approaches in sensing,imaging,energy harvesting,photochemical catalysis,molecular-scale optoelectronic devices,and information processing and data storage.This term refers to the confinement of electromagnetic waves(light)within a small spatial region,typically much smaller than the wavelength of the light itself[1].展开更多
The realization of an efficient optical sensor based on a photonic crystal metasurface supporting bound states in the continuum is reported. Liquids with different refractive indices, ranging from 1.4000 to 1.4480, ar...The realization of an efficient optical sensor based on a photonic crystal metasurface supporting bound states in the continuum is reported. Liquids with different refractive indices, ranging from 1.4000 to 1.4480, are infiltrated in a microfluidic chamber bonded to the sensing dielectric metasurface. A bulk liquid sensitivity of 178 nm/RIU is achieved, while a Q-factor of about 2000 gives a sensor figure of merit up to 445 in air at both visible and infrared excitations. Furthermore, the detection of ultralow-molecular-weight(186 Da) molecules is demonstrated with a record resonance shift of 6 nm per less than a 1 nm thick single molecular layer. The system exploits a normal-to-the-surface optical launching scheme, with excellent interrogation stability and demonstrates alignment-free performances, overcoming the limits of standard photonic crystals and plasmonic resonant configurations.展开更多
文摘Light localization has transformative implications for advancing the fields of chemistry and physics,enabling new approaches in sensing,imaging,energy harvesting,photochemical catalysis,molecular-scale optoelectronic devices,and information processing and data storage.This term refers to the confinement of electromagnetic waves(light)within a small spatial region,typically much smaller than the wavelength of the light itself[1].
文摘The realization of an efficient optical sensor based on a photonic crystal metasurface supporting bound states in the continuum is reported. Liquids with different refractive indices, ranging from 1.4000 to 1.4480, are infiltrated in a microfluidic chamber bonded to the sensing dielectric metasurface. A bulk liquid sensitivity of 178 nm/RIU is achieved, while a Q-factor of about 2000 gives a sensor figure of merit up to 445 in air at both visible and infrared excitations. Furthermore, the detection of ultralow-molecular-weight(186 Da) molecules is demonstrated with a record resonance shift of 6 nm per less than a 1 nm thick single molecular layer. The system exploits a normal-to-the-surface optical launching scheme, with excellent interrogation stability and demonstrates alignment-free performances, overcoming the limits of standard photonic crystals and plasmonic resonant configurations.
