Abstract

A multiresolution direct binary search iterative procedure is used to design small dielectric irregular diffractive optical elements that have subwavelength features and achieve near-field focusing below the diffraction limit. Designs with a single focus or with two foci, depending on wavelength or polarization, illustrate the possible functionalities available from the large number of degrees of freedom. These examples suggest that the concept of such elements may find applications in near-field lithography, wavelength-division multiplexing, spectral analysis, and polarization beam splitters.

© 2006 Optical Society of America

Demonstration of mode conversion in an irregular waveguide

M. Yang, H. Chen, K. J. Webb, S. Minin, S. L. Chuang, and G. R. Cueva
Opt. Lett. 31(3) 383-385 (2006)

Silicon-on-insulator irregular waveguide mode converters

Hua-Tsai Chen and Kevin J. Webb
Opt. Lett. 31(14) 2145-2147 (2006)

Precision measurement with visual feedback using binary phase diffractive optical elements

Edward Buckley, Adrian Cable, Tim Wilkinson, and Nic Lawrence
Opt. Lett. 31(8) 1053-1054 (2006)

Writing 40 nm marks by using a beaked metallic plate near-field optical probe

T. Matsumoto, Y. Anzai, T. Shintani, K. Nakamura, and T. Nishida
Opt. Lett. 31(2) 259-261 (2006)

Multiband diffraction and refraction control in binary arrays of periodically curved waveguides

Stefano Longhi
Opt. Lett. 31(12) 1857-1859 (2006)