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Sensitivity of imaging properties of metal-dielectric layered flat lens to fabrication inaccuracies

Kotyński R., Baghdasaryan H., Stefaniuk T., Pastuszczak A., Marciniak M., Lavrinenko A., Panajotov K., Szoplik T.

Opto-Electronics Review

2010

Vol. 18, No. 4

446-457

We characterize the sensitivity of imaging properties of a layered silver-TiO₂ flat lens to fabrication inaccuracies. The lens is designed for approximately diffraction-free imaging with subwavelength resolution at distances in the order of a wavelength. Its operation may be attributed to self-collimation with a secondary role of Fabry-Perot resonant transmission, even though the first order effective medium description of the structure is inaccurate. Super-resolution is maintained for a broad range of overall thicknesses and the total thickness of the multilayer is limited by absorption. The tolerance analysis indicates that the resolution and transmission efficiency are highly sensitive to small changes of layer thicknesses.

Light polarization fingerprints on nonlinear dynamics of vertical-cavity surface-emitting lasers

Panajotov K., Sciamanna M., Gatare I., Arizaleta Arteaga M., Thienpont H.

Opto-Electronics Review

2008

Vol. 16, No. 4

337-346

In this paper we summarize the recent results on nonlinear dynamics of vertical-cavity surface-emitting lasers (VCSELs) which are bearing the fingerprints of the particular polarization properties of VCSELs. Due to the surface emission and cylindrical symmetry, VCSELs lack strong polarization anisotropy and may undergo polarization switching and polarization mode-hopping. This provides new specificities to the rich nonlinear dynamics induced in VCSELs by an external perturbation. We unveil both experimentally and theoretically these new specificities for the case of optical feedback, optical injection, and unidirectional synchronization between VCSELs.

Polarisation switching in vertical-cavity surface-emitting lasers: from experimental observations to applications

Verschaffelt G., Panajotov K., Albert J., Nagler B., Peeters M., Danckaert J., Veretennicoff I., Thienpont H.

Opto-Electronics Review

2001

Vol. 9, No. 3

257-268

Touted as promising components for present and future data-communication and sources for photonic switching fabrics, vertical-cavity surface-emitting lasers (VCSELs) have been studied in detail during the past years, with a focus on their static light-current and dynamic intensity modulation characteristics. Their superior beam quality, low power consumption, Gigahertz modulation bandwidth and the possibility of manufacturing these devices in 2D arrays are often cited as substantial advantages compared to traditional edge-emitting semiconductor lasers or light emitting diodes. A disadvantage of VCSELs is that the polarisation of the emitted light is not defined a priori due to the VCSEL’s quasi-cylindrical symmetry and its direction of lasing perpendicular to the active region. However, real VCSELs do emit linearly polarised light and often polarisation switching from one state to the orthogonal one is observed as the current is changed. In this contribution we will discuss the experimental characteristics of this intriguing polarisation switching phenomenon. We will give an overview of various physical mechanism proposed to explain the polarisation behaviour of these devices and we will illustrate the use of this polarisation switching in the implementation of reconfigurable optical interconnects.