Direct femtosecond laser fabricated photon sieve

Vanessa R.M. Rodrigues, Jayashree A. Dharmadhikari, Aditya K. Dharmadhikari, Santhosh Chidangil, Deepak Mathur, Hema Ramachandran

Research output: Contribution to journalArticlepeer-review


Photon sieves, a collection of randomly positioned apertures, focus electromagnetic radiation diffractively and find applications in x-ray optics to astronomy to bio-medical imaging. Femtosecond laser direct writing is an emerging rapid, reliable, and versatile technique for creating diffraction-limited features in dielectrics and metals. Using this technique, we produce localized spots with a modified refractive index within bulk glass and thus fabricate phase photon sieves for optical wavelengths. The distribution of spots was based on numerical simulations. A comparison of the performance of the phase photon sieves and zone-plates created showed a superior performance of the former in terms of tighter focusing and reduction of secondary maxima, thus offering better spatial resolution and imaging capabilities.

Original languageEnglish
Pages (from-to)1328-1341
Number of pages14
JournalOSA Continuum
Issue number4
Publication statusPublished - 15-04-2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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