A new class of short-wave infrared (SWIR) photon detectors, called the nano-injection photon detectors, has been recently developed to address the main problem of using nanoscale features for light detection: Even though nanoscale sensors offer high sensitivity, their interaction with visible or infrared light is severely limited by their miniscule volume. ™e nano-injection detectors have highly sensitive nanometer-sized pillars, “nano-injectors,” on large, thick absorption layers. ™ese large, thick layers capture incoming light efficiently, and the nano-injectors sense and amplify these signals. Due to the pairing of thick absorbers and nano-injectors, high sensitivity and high efficiency can be simultaneously attained, which can satisfy a growing need for identifying and counting photons in many modern applications.