Abstract

A type of surface-plasmon-polariton bandgap structure for generating a confined nanometric optical field with high intensity and very small sidelobes is simulated by using the finite-difference time-domain method. The numerical results show that the intensity enhancement of the confined field can reach 2 orders of magnitude, with a resolution (FWHM of the zero-order mode) of 0.33λ and the high-order modes (sidelobes) being effectively suppressed to no more than 15%. These properties ensure the confined field to be used as a near-field source. Detailed and systematic investigations of the enhancement and the localization versus the structure parameters are performed, and the physical mechanisms behind these phenomena are explained. Potential applications of the confined field in near-field detection and imaging are discussed through interactions with different types of nanospheres. The simulated results reveal that details with feature sizes down to 0.13λ can be resolved.

© 2008 Optical Society of America

Full Article  |  PDF Article

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 (7)

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 (4)

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

Metrics

You do not have subscription access to this journal. Article level metrics 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