Far infra-red, mm and sub-mm astronomy requires very large arrays of detectors for future wide field cameras and spectrometers. We present an array of lens-antenna coupled Microwave Kinetic Inductance Detectors (MKID) for a wide field camera at 350 GHz. We discuss the optimization to maximize the usable detector yield and matching the array to the readout to enable array performance close to the background limit. We overview the optical characterization techniques required to have confidence in the instrument performance prior to on telescope integration, finally giving measured optical performance for an optimized array.@en

DESHIMA 2.0 is a sub-millimetre wave spectrometer based on a single superconducting chip with a large instantaneous bandwidth. The instrument consists of a Quasi-optical (QO) system and an on-chip filter-bank coupled to an array of Kinetic Inductance Detectors (KID). In this work, this broad band QO system, operating at sub-millimetre wavelengths (220 GHz to 720 GHz), will be presented. This design is achieved using a field matching technique and consists of a hyper-hemispherical leaky lens antenna coupled to a series of Dragonian reflectors. The optimized design has an average illumination efficiency over the band of ~70%. This performance is also measured directly through the response of the KIDs.@en