RECENT RESULTS

SPECIAL ANTI-REFLECTION COATINGS

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)

PATTERNED DISTRIBUTED BRAGG REFLECTORS

Distributed Bragg reflectors do not reflect with the expected efficiency for all polarization orientations of incident light. Reflectors with line patterns replicated from CD or DVD will reflect linearly polarized light with better efficiency. More details in Thin solid films (2023).

DIELECTRIC METASURFACE

A dielectric metasurface containing silicon nanopillars of specific size and shape will have two resonances in the near-infrared, with equally good response for anemia detection. More details in Front. Photonics (2023).

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).

NONLINEAR OPTICS IN COMMUNICATIONS FIBER

By pumping short lengths of standard single-mode fiber used in fiber-optic communication with green light, we can demonstrate the generation of new wavelengths in blue and red due to inter-modal wave mixing. More details in OSA Continuum (2018).

LINE BROADENING IN ACTIVE FIBER

Short length (1 m) of erbium-doped fiber shows homogeneous broadening while longer lengths show a certain extent of mixed line broadening nature. More details in Opt. Quant. Electr. (2023).

TUNABLE FILTER IN TERAHERTZ RANGE

By stacking two layers of perforated surfaces, it is possible to demonstrate a continuously tunable filter in the range of 100-300 GHz. More details in Opt. Quant. Electr. (2023).