A
Ashim Dhakal
Researcher at Ghent University
Publications - 53
Citations - 1676
Ashim Dhakal is an academic researcher from Ghent University. The author has contributed to research in topics: Raman spectroscopy & Raman scattering. The author has an hindex of 16, co-authored 46 publications receiving 1439 citations. Previous affiliations of Ashim Dhakal include Kathmandu & IMEC.
Papers
More filters
Journal ArticleDOI
Low-Loss Singlemode PECVD Silicon Nitride Photonic Wire Waveguides for 532–900 nm Wavelength Window Fabricated Within a CMOS Pilot Line
Ananth Subramanian,Pieter Neutens,Ashim Dhakal,Roelof Jansen,Tom Claes,Xavier Rottenberg,Frédéric Peyskens,Shankar Kumar Selvaraja,Philippe Helin,B. DuBois,K. Leyssens,Simone Severi,Paru Deshpande,Roel Baets,P. Van Dorpe +14 more
TL;DR: In this paper, the dependence of loss on wire width, wavelength, and cladding is discussed in detail, and it is shown that cladded multimode and singlemode waveguides show a loss well below 1 dB/cm in the 532-900 nm wavelength range.
Journal ArticleDOI
Expanding the Silicon Photonics Portfolio With Silicon Nitride Photonic Integrated Circuits
Abdul Rahim,Eva Ryckeboer,Ananth Subramanian,Stéphane Clemmen,Bart Kuyken,Ashim Dhakal,Ali Raza,Artur Hermans,Muhammad Muneeb,Sören Dhoore,Yanlu Li,Utsav D. Dave,Peter Bienstman,Nicolas Le Thomas,Gunther Roelkens,Dries Van Thourhout,Philippe Helin,Simone Severi,Xavier Rottenberg,Roel Baets +19 more
TL;DR: In this paper, the advantages and challenges associated with these two material platforms are discussed, and the case of dispersive spectrometers, which are widely used in various silicon photonic applications, is presented.
Journal ArticleDOI
Silicon and silicon nitride photonic circuits for spectroscopic sensing on-a-chip [Invited]
Ananth Subramanian,Eva Ryckeboer,Ashim Dhakal,Frédéric Peyskens,Aditya Malik,Bart Kuyken,Haolan Zhao,Shibnath Pathak,Alfonso Ruocco,Andreas De Groote,Pieter Wuytens,Daan Martens,François Leo,Weiqiang Xie,Utsav D. Dave,Muhammad Muneeb,Pol Van Dorpe,Joris Van Campenhout,Wim Bogaerts,Peter Bienstman,Nicolas Le Thomas,Dries Van Thourhout,Zeger Hens,Gunther Roelkens,Roel Baets +24 more
TL;DR: In this paper, the development of silicon and silicon nitride (Si3N4) integrated photonic integrated circuits for various spectroscopic sensing applications is presented, including waveguide-based absorption and Raman and surface enhanced Raman spectroscopy.
Journal ArticleDOI
Evanescent excitation and collection of spontaneous Raman spectra using silicon nitride nanophotonic waveguides.
Ashim Dhakal,Ananth Subramanian,Pieter Wuytens,Frédéric Peyskens,Nicolas Le Thomas,Roel Baets +5 more
TL;DR: High contrast, CMOS-compatible integrated photonic waveguides for Raman spectroscopy are experimentally demonstrate and derive the dependence of collected Raman power with the waveguide parameters and experimentally verify the derived relations.
Journal ArticleDOI
Visible-to-near-infrared octave spanning supercontinuum generation in a silicon nitride waveguide.
Haolan Zhao,Bart Kuyken,Stéphane Clemmen,François Leo,Ananth Subramanian,Ashim Dhakal,Philippe Helin,Simone Severi,Edouard Brainis,Gunther Roelkens,Roel Baets +10 more
TL;DR: The generation of an octave spanning supercontinuum covering 488-978 nm (at -30 dB) is demonstrated for the first time on-chip for biophotonic applications and frequency metrology.