Abstract

Here, we demonstrate a flat nanofocalizer for converging light field into a uniform subwavelength light spot array based on the fractional Talbot effect by developing a direct laser writing technique with 3D fabrication precision. The fractional Talbot effect endows the device with the merits of high compression ratio and modular design capability for transforming a plane wave into arrayed light focal spots. By combining a synergistic laser printing technique, we introduce a buffer layer for improving the fabrication precision of structural height in favor of accurately manipulating the phase delay. For a given light wavelength at 750 nm, by precisely producing a nanofocalizer consisting of periodic unit elements with the dimensions of ${300}\;({\rm width}) \times {600}\;({\rm length}) \times {585}\;({\rm height})\;{\rm nm}$, we have achieved ${5} \times {6}$ light spot array with modular design, while the full width at half-maximum of a single focused light spot can be reduced to $\sim 0.82 \lambda$. Our research may pave the way for realizing subwavelength optical devices capable of being readily integrated to existing optical systems.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
3D printing of silica glass through a multiphoton polymerization process

Thomas Doualle, Jean-Claude André, and Laurent Gallais
Opt. Lett. 46(2) 364-367 (2021)

Talbot effect in arrays of helical waveguides

Kaiyun Zhan, Lichao Dou, Ruiyun Jiao, Wenqian Zhang, and Bing Liu
Opt. Lett. 46(2) 322-325 (2021)

High-quality high-throughput silicon laser milling using a 1 kW sub-picosecond laser

Daniel Holder, Rudolf Weber, Christoph Röcker, Gerhard Kunz, David Bruneel, Martin Delaigue, Thomas Graf, and Marwan Abdou Ahmed
Opt. Lett. 46(2) 384-387 (2021)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription