Department of Physics and Centre for Lasers and Photonics
INDIAN INSITUTE OF TECHNOLOGY KANPUR
RECENT RESULTS
Comparing 1-D and 2-D patterns for sensing
1-D and 2-D patterns with highly comparable features (such as pattern height and material index) are made, coated with gold, and tested for sensing characteristics. More details in J. Opt. (IOP) (2025).
Multi-modal sensing using plasmonic metasurface
The plasmonic metasurface made with the chosen design can sense the change in refractive index over a wide range, due to the presence of well-spaced multiple modes. More details in J. Phys. Photonics (IOP) (2024).
Multifunctional millimeter lens array
Millimeter lens array made on a flexible polymer substrate is studied for effects such as focusing, imaging and beam shaping, both in monochromatic and broadband white light. More details n J. Lightwave Technol. (2024).
Optical haze in nanostructured surfaces
Both transmission haze and reflection haze from patterned surfaces can be modified by the suitable choice of pattern shape (nanodimple ND or nanobump NB), pattern size (A>B) and pattern depth (1<2). More details in Frontiers of Optoelectronics (2024).
Normal anti-reflection coatings are few-layer coatings on one side of a substrate. Our work shows that an additional single-layer coating of suitable thickness and of the right material coated on the rear-side of the substrate can improve anti-reflection further. More details in Ind. J. Phys. (2024)
Special anti-reflection coatings
One-dimensional plasmonic gratings
Plasmonic gratings of step and sinusoidal profiles are compared, and the advantages of sinusoidal profile are discussed. The grating has a specific periodicity and gold layer thickness. More details in Photonics and Nanostr. - Fundamentals and applications (2024).
Laser linewidth narrowing by intra-cavity saturable absorption
A suitable length of unpumped erbium-doped fiber in an erbium-doped fiber laser cavity acts as a saturable absorber and narrows the laser linewidth without lowering the laser power. More details in Opt. Fiber Technol. (2024).