Abstract

We present a superresolution technique for imaging objects beyond the diffraction limit imposed by the limited numerical aperture (NA) of a general optical system. A coded phase mask (CPM) displayed on a spatial light modulator is introduced between the object and the input aperture of an ordinary lens-based imaging system. Consequently, the effective NA is increased beyond the inherent NA of the optical imaging system. Unlike conventional systems, the imaging in our proposed method is not direct from an object to a sensor, and the system requires a one-time calibration. In the calibration mode, a point object is mounted in the object plane, and the point spread intensity pattern is recorded. Following the calibration, the system is ready for imaging an arbitrary number of 2D objects. The intensity pattern from any object placed at the same axial location of the point object, and modulated by the same CPM, is recorded once by a digital camera. The superresolved image of the object is reconstructed by a nonlinear cross-correlation between the abovementioned two intensity patterns. The effective NA and the new resolution limit can be tuned by changing the scattering degree of the CPM.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Partial aperture imaging by systems with annular phase coded masks

Angika Bulbul, A. Vijayakumar, and Joseph Rosen
Opt. Express 25(26) 33315-33329 (2017)

Resolution enhancement in nonlinear interferenceless COACH with point response of subdiffraction limit patterns

Mani Ratnam Rai, A. Vijayakumar, Yusuke Ogura, and Joseph Rosen
Opt. Express 27(2) 391-403 (2019)

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 (5)

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 (7)

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