52 citations · 71 across the 14 of their papers we have counts for
8 papers · 1 filter
Ablation of black-Si by (Gauss-)Bessel femtosecond laser beams
Nan Zheng, Hsin-Hui Huang, Nguyen Hoai An Le +7
Laser machining and modification of black-Si (b-Si) by femtosecond laser Gaussian (G-) and Gauss-Bessel (GB-) beams are compared at a wavelength of 1030 nm. The GB-beam was generat…
Bessel-beam direct-write of the etch-mask in a nano-film of alumina for high-efficiency Si solar cells
Tomas Katkus, Soon Hock Ng, Haoran Mu +14
Large surface area applications such as high-efficiency > 26% solar cells require surface patterning with 1-10 micrometers periodic patterns at high fidelity over 1-10 cm^2 areas (…
Determination of Stokes vector from a single image acquisition
Shuji Kamegaki, Meguya Ryu, Soon Hock Ng +4
Four Stokes parameters (1852) define the polarisation state of light. Measured changes of the Stokes vector of light traversing an inhomogeneous sample are linked to the local anis…
Beyond Lambertian light trapping for large-area silicon solar cells: fabrication methods
Jovan Maksimovic, Jingwen Hu, Soon Hock Ng +7
Light trapping photonic crystal (PhC) patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%, for light-to-ele…
Imaging with Diffractive Axicons Rapidly Milled on Sapphire by Femtosecond Laser Ablation
Daniel Smith, Soon Hock Ng, Molong Han +4
Fabrication of large area (sub 1 cm cross-section) micro-optical components in a short period of time (approximately 10 min) and with lesser number of processing steps is highly de…
All femtosecond optical pump and X-ray probe: holey-axicon for free electron laser
V. Anand, J. Maksimovic, T. Katkus +21
We put forward a co-axial pump(optical)-probe(X-rays) experimental concept and show performance of the optical component. A Bessel beam generator with a central 100 micrometers-dia…
Fresnel incoherent correlation holography with single camera shot
Vijayakumar Anand, Tomas Katkus, Stefan Lundgaard +4
Fresnel incoherent correlation holography (FINCH) is a self-interference based super-resolution three-dimensional imaging technique. FINCH in inline configuration requires an activ…
Dielectric cross-shaped resonator based metasurface for vortex beam generation in Mid-IR and THz wavelengths
Raghu Dharmavarapu, Ken-ichi Izumi, Ikufumi Katayama +7
Metasurfaces are engineered thin surfaces comprising two dimensional (2D) arrays of sub-wavelength spaced and sub-wavelength sized resonators. Metasurfaces can locally manipulate t…