Development of a Phase-modulating Beam Multiplexer for a THz Local Oscillator
B. Pedroni (Student TU Delft)
Y. Shao (Student TU Delft)
D. Ren (TU Delft - ImPhys/Adam group)
W. Ji (TU Delft - ImPhys/Adam group)
J. R. Silva (SRON–Netherlands Institute for Space Research)
A.J.L. Adam (TU Delft - ImPhys/Adam group)
J.R. Gao (SRON–Netherlands Institute for Space Research, TU Delft - ImPhys/Adam group)
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Abstract
We propose a novel approach to multiplex a single Gaussian beam from a THz source into seven beams arranged in a hexagonal configuration, matching an array of Hot Electron Bolometer (HEB) mixers. This configuration is necessary for the High-Resolution Receiver (HiRX) instrument on the proposed NASA Single Aperture Large Telescope for Universe Studies (SALTUS) space mission. The beam splitter relies on a reflector that introduces a phase shift to the incident Gaussian beam; after propagation, the desired amplitude distribution is achieved at the mixer array plane. Unlike existing THz multiplexers, our method does not use a phase grating based on the repetition of a unit cell. Instead, we employ an iterative phase reconstruction (Gerchberg- Saxton) algorithm to retrieve the required phase shift. This paper discusses the scientific motivation, current state of the art, design methodology, simulation outcomes, and experimental validation of the reflector. [...]