Integrated nanophotonic systems for fluorescence sensing and bioimaging are very promising for health care, biomedicine, biosensing, and environmental monitoring applications that require low cost, compact size, and a capability for high-throughput screening. This multidisciplinary research address significant challenges in micro-optical design and component miniaturization that must be overcome to realize such systems (see Publications ).
Biophotonics: Sensing and Imaging
Plasmonic structures and devices operating at optical frequencies have interesting applications such as on-chip integration of optical circuits, surface or interface technology, data storage, and bio-sensing. What makes the plasmonic structure unique is its potential for spatial confinement of electromagnetic (EM) energy within subwavelength dimensions over a wide spectral range. This occurs through the excitation of surface plasmon polaritons (SPP), which offer an attractive approach to overcome the size limitation that diffraction imposes on conventional photonic structures.
What has been missing until very recently is an effective method for ensuring that the generated SPPs travel only in the desired directions from the subwavelength launching point. Recently, we numerically demonstrated that two surface waveguide structures placed on the opposite sides of a slit can be introduced to confine and to guide light of different frequencies in opposite directions. Such structures, which are under continuing investigation, should be able to operate at frequencies ranging from the visible to THz domains. The grating structures can function not only as a DBR reflector for one wavelength, but also as an effective waveguide for the other wavelength (see Publications [1,2,5]).