We generate a zero-order Bessel beam with a laser beam focused onto an elastomeric replica of a weevil carapace scale. Carapace surface structures are imprinted on an elastomeric cast via soft lithography. The output Bessel beam exhibits the expected properties of non-diffraction over a propagation range of 30 cm. The width of the central spot at a propagation distance of 25 cm is 296.8 μm, corresponding to a replicated weevil scale with a diameter of 64.3 μm acting as an annular slit. Self-healing of the beam after encountering a wire obstruction is also observed.
Our current work discusses an alternative cost-effective method for producing elliptical zero-order Bessel beams with a simple optical system based on a commercially available transmission grating. A zero-order Bessel beam is made to pass through a diffraction grating with a groove density of 600 lines per mm. An elliptical Bessel beam intensity profile is obtained with the 1st-order (m = 1) diffracted beam when the grating is rotated about an axis parallel to the grating vector. For a grating tilted by 20 deg from the vertical, non-diffraction of the elliptical Bessel beam is observed over a propagation range from 10 to 95 cm with an average core diameter of 404 um. The elliptical Bessel beam at m = 1 has an eccentricity of 0.6 for a grating tilt of 20 deg.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.