In this paper we present an experimental and theoretical description of the dynamic of spatial patterns obtained in a video feedback loop. A video camera monitors the screen to which it is connected and can turn around its optical axis at an angle alpha. Under certain conditions of brightness and magnification, this optoelectronic system produces spatiotemporal patterns in the form of spots loc...

Conventional optical components rely on gradual phase shifts accumulated during light propagation to shape light beams. New degrees of freedom are attained by introducing abrupt phase changes over the scale of the wavelength. A two-dimensional array of optical resonators with spatially varying phase response and subwavelength separation can imprint such phase discontinuities on propagating ligh...

able for the more unusual geometries of some biological particles. Nevertheless, good approximations can often be made as demonstrated by the excellent results of Latimer and co-workers ~ in their scattering calculations for some highly complex turbid suspensions (yeast cells, chloroplasts, bacteria, etc.). The meaningful extension of circular diehroism and optical rotatory dispersion methods t...

The future of ultra-fast optical communication systems is inevitably connected with progress in optical circuits and nanoantennas. One of the key points of this progress is the creation of elementary components of optical devices with scattering diagrams tailored for redirecting the incident light in a desired manner. Here we demonstrate theoretically and experimentally that a small, simple, sp...

The term geometrical–optical illusions was coined by Johann Joseph Oppel (1815–1894) in 1855 in order to distinguish spatial distortions of size and orientation from the broader illusions of the senses. We present a translation of Oppel’s article and a commentary on the material described in it. Oppel did much more than give a name to a class of visual spatial distortions. He examined a variety...

Optical trapping is a widely used technique, with many important applications in biology and metrology. Complete modelling of trapping requires calculation of optical forces, primarily a scattering problem, and nonoptical forces. The T-matrix method is used to calculate forces acting on spheroidal and cylindrical particles. Preprint of: T. A. Nieminen, H. Rubinsztein-Dunlop, N. R. Heckenberg an...

We propose a novel cell manipulation method of Integrated Optical Tweezers (IOT) with microtools made of negative photoresist, SU-8 (MicroChem). This microtool is made by photolithography and hence it has complex shape. IOT is a novel optical tweezers integrating Time-Shared Scanning (TSS) [1] for high speed manipulation of a few objects and Generalized Phase Contrast (GPC) [2] for trapping a l...

We present a set of techniques and materials we are currently developing which enable very broadband and highly effective optical devices in the spectral region from 20 GHz to 20 THz. Many of these devices have already been employed in terrestrial, airborne and space based telescope systems.