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Showing 1–6 of 6 results

Advanced filters: Author: M. Zahirul Alam Clear advanced filters

Broadband frequency translation through time refraction in an epsilon-near-zero material

Here, the authors present an experimental demonstration of adiabatic frequency conversion using the concept of time boundary by exploiting the properties of an ITO film operating near its epsilon-near-zero frequency. They demonstrate a large and controllable shift up to 14.9 THz.

Yiyu Zhou
M. Zahirul Alam
Robert W. Boyd
ResearchOpen Access01 May 2020
Nature Communications

Volume: 11, P: 1-7
Ultra-high-Q resonances in plasmonic metasurfaces

Metallic nanostructures are useful in many optical devices due to their nonlinear properties and responses to interaction with light. Here the authors demonstrate a metasurface of gold nanoparticle arrays with ultra-narrow surface lattice resonances of high quality-factor that operates in the telecommunication band.

M. Saad Bin-Alam
Orad Reshef
Ksenia Dolgaleva
ResearchOpen Access12 Feb 2021
Nature Communications

Volume: 12, P: 1-8
Large optical nonlinearity of nanoantennas coupled to an epsilon-near-zero material

Enhanced nonlinear response of 50-nm-thick antennas in the vicinity of an epsilon-near-zero material enable an optically induced refractive index change of ±2.5 over a 200 nm spectral range.

M. Zahirul Alam
Sebastian A. Schulz
Robert W. Boyd
Research26 Jan 2018
Nature Photonics

Volume: 12, P: 79-83
A novel MPPT approach for photovoltaic system using Pelican optimization and high-gain DC–DC converter

Khadiza Akter
S. M. A. Motakabeer
Vinay Kumar Jadoun
ResearchOpen Access18 Nov 2025
Scientific Reports

Volume: 15, P: 1-22
Nonlinear optical effects in epsilon-near-zero media

Materials with vanishingly small dielectric permittivity, known as epsilon-near-zero materials, enable strong ultrafast optical nonlinear responses within a sub-wavelength propagation length. This Review surveys the various observations of nonlinear phenomena in this class of materials.

Orad Reshef
Israel De Leon
Robert W. Boyd
Reviews21 Jun 2019
Nature Reviews Materials

Volume: 4, P: 535-551
Assessment of mental well-being and its socio-economic determinants among older adults in the Rohingya refugee camp of Bangladesh

Afsana Anwar
Nahida Akter
Sabuj Kanti Mistry
ResearchOpen Access02 Aug 2024
Scientific Reports

Volume: 14, P: 1-9