Howard Hui

About Me

I am a research scientist with the Observational Cosmology Group at Caltech/NASA Jet Propulsion Lab and an affiliate of the Keck Institute for Space Studies. I earned my Ph.D. in Physics from Caltech in 2018 under Professor Jamie Bock. My research focuses on developing instruments that probe the early Universe through telescopes operating in millimeter-wave, far-infrared, and near-infrared wavelengths.

Research Highlights

BICEP

BICEP is a set of small aperture telescopes at the South Pole designed to measure the polarization of the Cosmic Microwave Background and search for inflation signatures. I led the design of the 95GHz BICEP3 receiver-focusing on the detector and readout systems as part of my Ph.D. dissertation-and analyzed its first dataset from 2016 to 2018.

SPHEREx

I lead the calibration efforts for the SPHEREx mission, a NASA medium explorer satellite set to launch in early 2025. SPHEREx will map the entire near-infrared sky across more than 100 spectral channels, unlocking insights into cosmic inflation, galaxy distribution, and the history of light from stars and galaxies. Our team is responsible for integrating, calibrating, and commissioning the telescope in orbit. As the mission’s Calibration Scientist, I ensure precise instrument performance by analyzing systematics and their impact on both cosmology and Extragalactic Background Light science.

Research Highlights

For more details on my analysis projects and instruments development, please visit my research page. My CV and contact information are also available there. Outside Outside of work, I enjoy exploring the nature around the world.

SPHEREx

The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer mission (SPHEREx) will study the history of galaxies and the origin of our universe as well as the origin of water in planetary systems by mapping the entire sky in optical and infrared light, capturing detailed spectral information about hundreds of millions of stars and galaxies.

BLISS/SAFARI

We are developing ultra-low noise transition edge sensors (TESs) for the SAFARI far-IR spectrograph, part of the cryogenically-cooled SPICA mission. The sensitivity target for these devices is a per-pixel noise equivalent power (NEP) below 10-19 WHz-1/2.

BICEP/Keck Array

BICEP/Keck Array is a series telescopes locate at the Amundsen-Scott South Pole Station. This experiment aims to discover signatures of Inflation by detecting the Cosmic Gravitational-Wave Background via its weak imprint as the unique B-mode polarization signature of the CMB, directly probing the Universe at an earlier time than ever before.