Material Limitations on the Detection Limit in Refractometry (2009)
Peder Skafte-Pedersen, Pedro S. Nunes, Sanshui Xiao, Niels Asger Mortensen
We discuss the detection limit for refractometric sensors relying on high-Q optical cavities and show that the ultimate classical detection limit is given by min {Δn} ≳ η with n + iη being the...
Resonant-tunnelling-assisted crossing for subwavelength plasmonic slot waveguides (2008)
Xiao, Sanshui, Mortensen, Niels Asger
We theoretically investigate the properties of crossing for two perpendicular subwavelength plasmonic slot waveguides. We show that, when encountering nano intersection, the crosstalk for the direct...
Limits of slow-light in photonic crystals (2008)
Pedersen, Jesper Goor, Xiao, Sanshui, Mortensen, Niels Asger
While ideal photonic crystals would support modes with a vanishing group velocity, state-of-the art structures have still only provided a slow-down by roughly two orders of magnitude. We find that...
Nanostructure design for surface-enhanced Raman spectroscopy - prospects and limits (2008)
Xiao, Sanshui, Mortensen, Niels Asger, Jauho, Antti-Pekka
Surface-enhanced Raman spectroscopy (SERS) allows single-molecule detection due to the strong field localization occurring at sharp bends or kinks of the metal-vacuum interface. An important question...
Pedersen, Jesper, Xiao, Sanshui, Mortensen, Niels Asger
Slow-light enhanced absorption in liquid-infiltrated photonic crystals has recently been proposed as a route to compensate for the reduced optical path in typical lab-on-a-chip systems for...
Mortensen, Niels Asger, Xiao, Sanshui, Pedersen, Jesper
Optical techniques are finding widespread use in analytical chemistry for chemical and bio-chemical analysis. During the past decade, there has been an increasing emphasis on miniaturization of...
Xiao, Sanshui, Mortensen, Niels Asger, Qiu, Min
Enhanced transmissions through a gold film with arrays of subwavelength holes are theoretically studied, employing the rigid full vectorial three dimensional finite difference time domain method....
Slow-light enhancement of Beer-Lambert-Bouguer absorption (2007)
Mortensen, Niels Asger, Xiao, Sanshui
We theoretically show how slow light in an optofluidic environment facilitates enhanced light-matter interactions, by orders of magnitude. The proposed concept provides strong opportunities for...
Xiao, Sanshui, Mortensen, Niels Asger
Optofluidic sensors based on highly dispersive two-dimensional photonic crystal waveguides are theoretically studied. Results show that these structures are strongly sensitive to the refractive index...
Liquid-infiltrated photonic crystals: Ohmic dissipation and broadening of modes (2007)
Mortensen, Niels Asger, Ejsing, Simon, Xiao, Sanshui
The pronounced light-matter interactions in photonic crystals make them interesting as opto-fludic "building blocks" for lab-on-a-chip applications. We show how conducting electrolytes cause...
Highly dispersive photonic band-gap-edge optofluidic biosensors (2006)
Xiao, Sanshui, Mortensen, Niels Asger
Highly dispersive photonic band-gap-edge optofluidic biosensors are studied theoretically. We demonstrate that these structures are strongly sensitive to the refractive index of the liquid, which is...
Mortensen, Niels Asger, Xiao, Sanshui, Felbacq, Didier
We consider meta materials made from a two-dimensional dielectric rod-type photonic crystal. The magnetic response is studied within the recently developed homogenization theory and we in particular...
Resonator channel drop filters in a plasmon-polaritons metal (2006)
Xiao, Sanshui, Liu, Liu, Qiu, Min
Channel drop filters in a plasmon-polaritons metal are studied. It shows that light can be efficiently dropped. Results obtained by the FDTD method are consistent with those from coupled mode theory....
Study of transmission properties for waveguide bends by use of a circular photonic crystal (2005)
We study the transmission properties for the waveguide bends composed by a circular photonic crystal. Two types (Y and U type) of the waveguide bends utilizing the circular photonic crystal are...
Surface-mode microcavity (2005)
Optical microcavities based on zero-group-velocity surface modes in photonic crystal slabs are studied. It is shown that high quality factors can be easily obtained for such microcavities in photonic...
Doppler effects in a left-handed material: a first-principle theoretical study (2004)
The Doppler effects for the reflected wave from a moving media are systemically analyzed in this paper. The theoretical formula for the Doppler shift in the left-handed material, which is described...
Xiao, Sanshui, Qiu, Min, Ruan, Zhichao, He, Sailing
Point imaging by a photonic crystal slab due to the negative refraction is studied theoretically. By investigating the transfer function of the imaging system, the influence of the surface...
A novel directional coupler utilizing a left-handed material (2003)
Xiao, Sanshui, Shen, Linfang, He, Sailing
A novel directional coupler with a left-handed material (LHM) layer between two single-mode waveguides of usual material is introduced. The coupling system is analyzed with the supermode theory. It...