@article { ISI:000362795100023,
	title = {An ultrahigh-contrast and broadband on-chip refractive index sensor based on a surface-plasmon-polariton interferometer},
	journal = {ANALYST},
	volume = {140},
	number = {21},
	year = {2015},
	pages = {7263-7270},
	publisher = {ROYAL SOC CHEMISTRY},
	type = {Article},
	address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND},
	abstract = {Using a double-slit structure fabricated on a gold film or a subwavelength (300 nm) plasmonic waveguide, high-contrast and broadband plasmonic sensors based on the interference of surface plasmon polaritons (SPPs) are experimentally demonstrated on chips. By adjusting the focused spot position of the p-polarized incident light on the double-slit structure to compensate for the propagation loss of the SPPs, the interfering SPPs from the two slits have nearly equal intensities. As a result, nearly completely destructive interference can be experimentally achieved in a broad bandwidth (\&gt;200 nm), revealing the robust design and fabrication of the double-slit structure. More importantly, a high sensing figure of merit (FOM*) of \&gt;1 x 10(4) RIU-1 (refractive index unit), which is much greater than the previous experimental results, is obtained at the destructive wavelength because of a high contrast ratio (C = 0.96). The high-contrast and broadband on-chip sensor fabricated on the subwavelength plasmonic waveguide may find important applications in the real-time sensing of particles and molecules.},
	issn = {0003-2654},
	doi = {10.1039/c5an00935a},
	author = {Wang, Yujia and Chen, Jianjun and Sun, Chengwei and Rong, Kexiu and Li, Hongyun and Qihuang Gong}
}
