Novel high contrast grating hollow core waveguides for enhanced gas spectroscopy Ajmal Thottoli, Ganga Chinna Rao Devarapu, Antonella D’Orazio, Giovanni Magno and Liam O’Faolain EPJ Web Conf., 309 (2024) 01009 Published online: 31 October 2024 DOI: 10.1051/epjconf/202430901009