Demonstration of integrated optics elements based on longranging surface plasmon polaritons.
ABSTRACT An experimental investigation of longranging surface plasmonpolariton waves guided along thin finite width Au structures embedded in a homogeneous background dielectric is reported. The operation of key passive integrated optics elements such as straight waveguides, sbends, yjunctions and couplers is demonstrated at a free space optical wavelength of 1550 nm. The influence of some important design parameters on the performance of these elements is presented and discussed.

 "Surface plasmon polaritons (SPPs), which are electromagnetic (EM) waves propagating and strongly confined at the metaldielectric interface, can enhance and guide light in subwavelength scale [1], [2]. This feature opens up previously inaccessible lengthscale for integrated optics [3]. Today, there have been several optical circuits proposed based on subwavelength EM confinement [4], [5]. "
IEEE Photonics Journal 02/2015; 7(1):4800208. · 2.33 Impact Factor 
 "They appear because at optical frequencies, the permittivity of a metal can be negative. The plasmonic technologies [2] [10] [45] [16] could allow important progresses in the miniaturization of electronic devices. "
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ABSTRACT: We study a spectral problem $(\mathscr{P}^{\delta})$ for a diffusion like equation in a 3D domain $\Omega$. The main originality lies in the presence of a parameter $\sigma^{\delta}$, whose sign changes on $\Omega$, in the principal part of the operator we consider. More precisely, $\sigma^{\delta}$ is positive on $\Omega$ except in a small inclusion of size $\delta>0$. Because of the signchange of $\sigma^{\delta}$, for all $\delta>0$ the spectrum of $(\mathscr{P}^{\delta})$ consists of two sequences converging to $\pm\infty$. However, at the limit $\delta=0$, the small inclusion vanishes so that there should only remain positive spectrum for $(\mathscr{P}^{\delta})$. What happens to the negative spectrum? In this paper, we prove that the positive spectrum of $(\mathscr{P}^{\delta})$ tends to the spectrum of the problem without the small inclusion. On the other hand, we establish that each negative eigenvalue of $(\mathscr{P}^{\delta})$ behaves like $\delta^{2}\mu$ for some constant $\mu<0$. We also show that the eigenfunctions associated with the negative eigenvalues are localized around the small inclusion. We end the article providing 2D numerical experiments illustrating these results. 
 "To date, several different types of LRSPP waveguiding configuration have been proposed and demonstrated, which include the traditional LRSPP waveguides that consist of metal stripes embedded in a homogeneous dielectric [9] [10] [11], and modified LRSPP structures incorporating additional dielectric layers on both sides of the metallic layers [12] [13] [14] [15] or comprising metal stripes embedded in highindex dielectrics [16] [17] [18]. Moreover, several other types of longrange plasmonic structure have also been proposed recently, such as the longrange dielectricloaded SPP waveguides (LRDLSPPWs) [19] [20] [21] and longrange channel plasmon polariton waveguides (LRCPPWs) [22]. "
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ABSTRACT: The characteristics of longrange hybrid plasmonic modes guided by multilayer metaldielectric planar waveguides are investigated at the telecom wavelength. These multilayer structures are formed by sandwiching thin metallic stripes into horizontal silicon slotlike waveguides. Comprehensive numerical studies regarding the geometric parameters' effects on the modal properties reveal that, by properly choosing the dimensions of the metal stripe and the lowindex gaps between the stripe and the silicon layers, the symmetric hybrid modes supported by the structures could feature simultaneously ultralong propagation distance (several centimeters) and subwavelength mode size. Consideration of possible fabrication imperfections shows that the optical performances of the waveguides are quite robust and highly tolerant to these errors. The presented multilayer plasmonic structures greatly extend the capabilities of conventional longrange surface plasmon polariton waveguides by successfully confining light into a subwavelength scale while maintaining the key advantage of enabling ultralowloss propagation, which could facilitate potential applications in ultralongrange plasmon waveguiding and realizations of compact, highperformance photonic components, as well as building optically integrated circuits with complex functionalities.Journal of optics 01/2014; 16(11). DOI:10.1088/20408978/16/1/015001 · 2.01 Impact Factor