  We provide a simple analysis based on ray optics and Dirac notation for one
and two-dimensional Cosine beams. We then went on to understand the properties
of the Bessel beams. For the first time, we report on a generation of
three-dimensional needle structures based on interference of one-dimensional
Cosine beams. Straightforward mathematical calculations are used to derive the
analytical expressions for Cosine beams. The present method of demonstration of
Cosine beams may be utilized to understand other structured modes. The Dirac
notation-based interference explanation used here can render new researchers to
discover an easy way to understand the wave nature of light in fundamental
interferometric experiments as well as in advanced-level experiments such as
beam engineering technology, imaging, particle manipulation, light sheet
microscopy, and light-matter interaction. We also provide an in-depth analysis
of similarities among Cosine, Bessel, and Hermite-Gaussian beams.
