Design and fabrication of a double-axicon for generation of tailorable self-imaged three-dimensional intensity voids.
We propose a new design for fabrication of a highly power-efficient double axicon to generate self-imaged three-dimensional intensity voids along the propagation of a beam. The conventional conical structure of an axicon is modified and shaped like an axiconlike structure with a double-gradient surface profile. The gradient conical surfaces generate Bessel beams with varying radial wave vectors that are superimposed and interfere to generate a sequence of three-dimensional intensity voids. The proposed element was fabricated using electron-beam lithography, and experimental verification of the design is reported.
Ahluwalia
B P S
BP
School of Electrical & Electronic Engineering, Nanyang-Technological University, Nanyang Avenue, Singapore 639798, Singapore.
Cheong
W C
WC
Yuan
X C
XC
Zhang
L S
LS
Tao
S H
SH
Bu
J
J
Wang
H
H