ORCID Profile
0000-0003-3956-0585
Current Organisations
University of Peradeniya
,
University of Adelaide
,
University of Melbourne
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: American Chemical Society (ACS)
Date: 20-01-2022
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4998131
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4998054
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4998132
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4998035
Publisher: Springer Science and Business Media LLC
Date: 06-04-2022
DOI: 10.1007/S11686-022-00531-7
Abstract: Ancylostoma spp. causing canine hookworm infections are distributed worldwide with a high prevalence in the South Asian region. Here, we report the first molecular identification of the canine hookworm infecting the dogs in Sri Lanka. Fresh faecal s les were collected from free-roaming dogs in tea estate communities in Talawakelle, processed and microscopically analysed for gastro-intestinal parasites. The common dog hookworm Ancylostoma sp. was further investigated using molecular diagnostic tools including PCR, sequencing, and phylogenetic analyses. Of the in idual dogs s led, 97.0% (97/100) were positive for GI parasites, identifying 14 species, all of which were zoonotic. Entamoeba sp. (58.0% (58/100)) was the most prevalent infection and Ancylostoma sp. (45.0% (45/100)) was the most prevalent helminth infection. Overall, helminth prevalence was higher in female dogs (92.5% (37/40)) than male dogs (73.3% (44/60)), potentially due to immune suppression during pregnancy and lactation. The prevalence and burden of Toxocara canis was higher in puppies (≤ 1 year) (68.8%(11/16) Chi-square test χ The local variant of A. caninum was phylogenetically unique and showed 99.2% similarity to that from India. The high prevalence of zoonotic GI parasites with public health significance highlights the importance of improving community well-being, veterinary care for dogs, and public awareness on zoonoses.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 28-04-2023
Abstract: Higher-order optical harmonics entered the realm of nanostructured solids being observed recently in optical gratings and metasurfaces with a subwavelength thickness. Structuring materials at the subwavelength scale allows us toresonantly enhance the efficiency of nonlinear processes and reduce the size of high-harmonic sources. We report the observation of up to a seventh harmonic generated from a single subwavelength resonator made of AlGaAs material. This process is enabled by careful engineering of the resonator geometry for supporting an optical mode associated with a quasi-bound state in the continuum in the mid-infrared spectral range at around λ = 3.7 μm pump wavelength. The resonator volume measures ~0.1 λ 3 . The resonant modes are excited with an azimuthally polarized tightly focused beam. We evaluate the contributions of perturbative and nonperturbative nonlinearities to the harmonic generation process. Our work proves the possibility to miniaturize solid-state sources of high harmonics to the subwavelength volumes.
Publisher: Wiley
Date: 02-01-2019
Publisher: Wiley
Date: 29-08-2017
Publisher: IEEE
Date: 05-2017
Publisher: Optica Publishing Group
Date: 2020
Abstract: Through the utilization of optical bound states in the continuum supported by resonant Si metasurfaces in the mid-IR spectral range, we demonstrate the generation of odd optical harmonics, from the 3 rd to the 11 th order.
Publisher: AIP Publishing
Date: 06-03-2023
DOI: 10.1063/5.0133866
Abstract: The development of nanophotonics systems for the manipulation of luminescent properties of single quantum emitters is essential for quantum communication and computing. Dielectric nanosystems enable various opportunities for light control through inherent electric and magnetic resonances however, their full potential has not yet been discovered. Here, emission properties of nitrogen-vacancy (NV) centers in nanodiamonds placed in the near-field zone of silicon nanoresonators are investigated. It is demonstrated experimentally that the spontaneous emission rate of single NV centers in 50 nm nanodiamonds can be modified by their coupling to spherical nanoantennas, reducing the mode of the lifetime distribution by ≈2 times from 16 to 9 ns. It is also shown that the collected intensity of photoluminescence emission from multiple NV centers in a 150 nm nanodiamond coupled to a cylindrical nanoantenna is increased by more than 50% compared to the intensity from the same nanodiamond on a bare substrate.
Publisher: IEEE
Date: 05-2017
Publisher: IOP Publishing
Date: 09-2018
Publisher: American Chemical Society (ACS)
Date: 02-03-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR02167A
Abstract: Using a femtosecond laser radiation, we generated hollow carbon spheres and hemispheres from 1D and 2D MOFs.
Publisher: Springer Science and Business Media LLC
Date: 31-05-2022
Publisher: IEEE
Date: 21-06-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR07953B
Abstract: We suggest a novel class of active nanoantennas based on diamond nanoparticles with embedded nitrogen-vacancy centres coupled to Mie resonances of nanoparticles. We study the optical properties of such nanoantennas including the field enhancement and Purcell effect, and experimentally demonstrate the enhancement of the fluorescence rate of the emitters due to particle resonances.
Publisher: SPIE
Date: 18-04-2021
DOI: 10.1117/12.2592977
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR90142F
Abstract: Correction for ‘Laser printing of optically resonant hollow crystalline carbon nanostructures from 1D and 2D metal–organic frameworks’ by Leila R. Mingabudinova et al. , Nanoscale , 2019, 11 , 10155–10159.
Publisher: SPIE
Date: 03-09-2019
DOI: 10.1117/12.2529501
Publisher: Optica Publishing Group
Date: 30-06-2021
DOI: 10.1364/JOSAB.424771
Abstract: Nanostructures made of high-refractive-index materials present a novel technological platform for efficient light manipulation at the nanoscale. Among all materials compatible with the currently available fabrication techniques, Si and GaP are the most suitable for the visible spectral range. Here, we consider a system consisting of a luminescent diamond nanoparticle with embedded color centers emitting light, placed on top of a Si or GaP cylindrical nanoantenna. We study theoretically how dielectric nanoantennas affect the emission properties of the system and predict a several-fold enhancement of the spontaneous emission rate of a single emitter located inside an optically small diamond nanoparticle. We compare performance of the two considered materials in different parts of the visible spectrum and find that for single dipole sources that emit at the blue end of the spectrum, it is beneficial to use GaP nanoantennas, while silicon becomes the material of choice for emitters at the red end of the spectrum.
Publisher: IOP Publishing
Date: 09-2018
Publisher: Optica Publishing Group
Date: 2020
DOI: 10.1364/CLEO_QELS.2020.FTH1C.5
Abstract: We demonstrate nonlinear silicon metasurfaces empowered by collective localized modes governed by bound states in the continuum operating in mid-infrared spectral range. When being resonantly excited, the metasurfaces generate 3 rd to 11 th odd optical harmonics.
Publisher: IOP Publishing
Date: 09-2018
Publisher: IEEE
Date: 08-2017
Publisher: IOP Publishing
Date: 09-2018
Publisher: IOP Publishing
Date: 11-2017
Publisher: IOP Publishing
Date: 2018
Publisher: AIP Publishing
Date: 12-2021
DOI: 10.1063/5.0061825
Abstract: Over the last decade, photonics in the mid-infrared (mid-IR) frequency range had major advances in both generation and detection of light. However, efficient manipulation of the mid-IR light still faces many challenges. Spatially inhomogeneous control over the wavefront and polarization of mid-IR radiation is particularly difficult. Many standard techniques used for visible and near-infrared frequencies, such as liquid crystal-based spatial light modulation, are not applicable in the mid-IR due to unfavorable material properties in that spectral range. Here, we demonstrate spatially inhomogeneous polarization control of the mid-infrared light using custom-designed vortex retarders. Vortex retarders, while being widely used in the near-infrared and visible spectral ranges for generation of cylindrical vector beams, have been missing in the mid-infrared spectral range. Our implementation of mid-infrared vortex retarders is based on the concept of metasurfaces. We demonstrate metasurface-based vortex retarders at the wavelengths of 2.9 and 3.5 μm. We compare the performance of all-dielectric metasurface vortex retarders with the elements arranged in square and hexagonal lattices [Arbabi et al., Nat. Nanotechnol. 10, 937–943 (2015) and Arbabi et al., Nat. Commun. 6, 7069 (2015)]. Our work could accelerate the adoption of metasurfaces for the development of novel classes of mid-infrared optical components.
Publisher: American Chemical Society (ACS)
Date: 13-05-2022
DOI: 10.1021/ACS.NANOLETT.2C01122
Abstract: Multiphoton processes of absorption photoluminescence have enabled a wide range of applications including three-dimensional microfabrication, data storage, and biological imaging. While the applications of two-photon and three-photon absorption and luminescence have matured considerably, higher-order photoluminescence processes remain more challenging to study due to their lower efficiency, particularly in subwavelength systems. Here, we report the observation of
Location: Russian Federation
Start Date: 2018
End Date: 2018
Funder: Russian Foundation for Basic Research
View Funded Activity