Photonic crystal-enhanced fluorescence through the extraction of dually polarized modes.
In this Letter, we demonstrate that fluorescence detection by using surface-bound fluorescent molecules can be enhanced by coupling the fluorescence emission with dually polarized resonant modes of a photonic crystal (PC) substrate. The PC was fabricated through nanoreplica molding by using a plastic substrate. It was designed such that the transverse magnetic (TM)- and transverse electric (TE)-polarized resonance coincided at a specific combination of the incident angle and the illumination wavelength. During excitation, the nonpolarized emission from cyanine-5 was simultaneously coupled with the TE and TM resonant modes and reradiated into the detection instrument, increasing the fluorescence collection efficiency and thus, enhancing the fluorescence detection.
Yu-An
YA
Wu
Po-Tsung
PT
Wu
Cheng-Sheng
CS
Huang
D002232:Carbocyanines / Q000737:chemistry; D055100:Optical Fibers; D017785:Photons; D013050:Spectrometry, Fluorescence / Q000295:instrumentation / Q000379:methods*; D013499:Surface Properties
D002232:Carbocyanines; C085321:cyanine dye 5