Beam Steering and Focusing With Linear Phiased Arrays

High-resolution beam steering using microlens arrays.

Imaging or beam-steering systems employing a periodic array of microlenses or micromirrors suffer from diffraction problems resulting from the destructive interference of the beam segments produced by the array. Simple formulas are derived for beam steering with segmented apertures that do not suffer from diffraction problems because of the introduction of a moving linear phase shifter such as ...

Fluidic beam steering in parasitically coupled patch antenna arrays

Beam steering via peak power decay in nonlinear waveguide arrays

We report the experimental observation and theoretical analysis of a novel beam-steering effect in periodic waveguide arrays that arises from the interplay between discrete diffraction, Kerr nonlinearity and any mechanism that effectively weakens the nonlinear part of the beam. In this regime the propagation direction shows increased sensitivity to the input angle and for a certain angular rang...

Fluidic microoptics with adjustable focusing and beam steering for single cell optogenetics.

Electrically controlled micron-scale liquid lenses have been designed, fabricated and demonstrated, that provide both adjustable focusing and beam steering, with the goal of applying them to optogenetic in vivo mapping of brain activity with single cell resolution. The liquid lens is formed by the interface between two immiscible liquids which are contained in a conically tapered lens cavity et...

Random Beam Patterns from Linear Arrays

The design of linear microphone arrays with randomly spaced elements is investigated. The probability distribution function for the element positions is derived in the continuum limit by matching the response of the array to an objective beam function. An analysis of the expected value and variance of the beam is presented as a function of the angular direction. Comparison of these metrics to t...