Publications by authors named "Gajendra L Mulay"
Article Synopsis
- High precision optical beam measurements are crucial for applications in fields like sensing and atomic force microscopy.
- A new measurement technique uses a scanning quadrant photodiode (QPD) and low-noise electronics to directly read the shifts between a signal beam and a reference beam.
- The method incorporates polarization multiplexing to achieve an accuracy of 150 nm while measuring the Goos-Hänchen shift of a beam reflecting off a gold surface.
Metasurfaces with sub-wavelength features are useful in modulating the phase, amplitude or polarization of electromagnetic fields. While several applications are reported for light manipulation and control, the sharp phase changes would be useful in enhancing the beam shifts at reflection from a metasurface. In designed periodic patterns on metal film, at surface plasmon resonance, we demonstrate Goos-Hanchen shift of the order of 70 times the incident wavelength and the angular shifts of several hundred microradians.
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