Direct femtosecond laser fabricated photon sieve
| Autor: | Deepak Mathur, Aditya K. Dharmadhikari, Vanessa R. M. Rodrigues, Santhosh Chidangil, J. A. Dharmadhikari, Hema Ramachandran |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Photon business.industry Phase (waves) Physics::Optics Laser Electromagnetic radiation Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Wavelength Optics law Femtosecond Electrical and Electronic Engineering business Refractive index Image resolution |
| Zdroj: | OSA Continuum. 2:1328 |
| ISSN: | 2578-7519 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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