A new approach for generating long‐distance self‐healing Bessel beams, which is based on
a ring‐shaped (annular) lens and a spherical lens in 4f‐configuration, is reported. With this …

Optical vortex (OV) can be used in the fields of optical manipulation and optical
communication because of its inherent orbital angular momentum (OAM). The size of the OV …

Diffractive optical elements are increasingly favoured due to their ability to provide
numerous design freedoms by adjusting the Fresnel regions. The design freedoms make it …

Through the use of diffractive optical elements (DOEs) in electro-optical systems, significant
design freedoms have been achieved in these systems. Because of these design freedoms …

We report an unusual type of Talbot effect. Unlike the traditional Talbot effect taking place in
the lateral direction, this ring-shaped Talbot effect takes place for beams with certain …

It is known that the Bessel beams are the solution to the Helmholtz equation, whose
amplitude distributions should be strictly conformed with the Bessel functions of the first kind …

Orbital angular momentum (OAM) modes have their phase distribution as exp (jlθ), which
resembles the plane wave in the Cartesian coordinates. Like the traditional lens, which can …

In this Letter, we introduce a graded-index (GRIN)–lens combination named GRIN-axicon,
which is a versatile component capable of generating high-quality scalable Bessel–Gauss …

A straightforward but powerful method to generate Bessel beams with continuous control of
spot size, intensity and non-diffraction zone length has been successfully developed and …

Mode generation and multiplexing for multi-mode waveguides and free space. The chapter
studies the mode generator and multiplexer, which are the key components for mode …