Ali Javey (Advisor)

Normal scenes captured by cameras involve light intensities spanning more than five orders of magnitude, which is often taken care of with auto-exposure/multiple exposures in high dynamic range (HDR) imaging technologies. Such technologies assign one or several uniform exposure levels and dynamic ranges for all pixels in the image, significantly squeezing the data precision for dimmer regions, causing fundamental information loss at the photodetection stage.

Ideally, each detector should independently decide its tradeoff between responsivity and speed. For...

Gas sensing has long been an area of academic and industrial interest. However, state of the art sensors still lack selectivity and sensitivity when it comes to differentiating gases of similar compositions. In this work, we explore methods to create multiplexed gas sensors that can differentiate these mixtures with high accuracy and long-term stability.

Project is currently funded by: Federal

The mid-wave infrared (MWIR) spectral range (λ = 3–8 μm) enables a variety of important sensing and imaging applications, including non-invasive bioimaging, night vision, and autonomous navigation. However, commercial MWIR photodetectors are largely limited to rigid imaging systems based on heteroepitaxial materials. Consequently, there is a growing demand for mechanically flexible MWIR imagers that can expand their functionality and practical applicability.

Recently, photodetectors based on van der Waals (vdW) black phosphorus (BP) flakes have demonstrated highly sensitive room-...