Acquisition of Hyperspectral Data with Colloidal Quantum Dots

Abstract

Hyperspectral sensors, combining the functions of photon detection with ultrahigh spectral resolution in a single device, have emerged as a new class of devices with significant potential for applications that rely on the input of optical information. Despite continued advancement, the widespread use of infrared hyperspectral sensors is still limited primarily due to the high cost associated with the growth and processing of epitaxial semiconductors, such as HgCdTe, InSb, and superlattices. Here, it is shown that colloidal quantum dots (CQDs) provide a promising route toward low‐cost, compact, and sensitive infrared hyperspectral sensors with tunable sensing ranges. In total, 64 narrowband channels with full‐width at half‐maxima down to ≈30 cm−1 can be realized by directly integrating CQDs sensors with a distributed Bragg mirror filter array. The results of high‐resolution spectra measurement with resolving power up to 180 and acquisition of a hyperspectral image cube in the short‐wave infrared range, benefitting from the fast (≈120 ns) and sensitive (>1010 Jones) performance of the CQDs sensors, are experimentally demonstrated.

Integration of Colloidal Quantum Dots with Photonic Structures for Optoelectronic and Optical Devices

“…Then, we will focus on -c) Reproduced with permission. [85] Copyright 2019, Wiley-VCH. d) The schematic of the on-chip detection with the plasmonic-silicon hybrid waveguide system with the inset of the cross-section of the metal-insulatormetal (MIM) waveguide with HgTe QD coating (left).…”

Advances of Sensitive Infrared Detectors with HgTe Colloidal Quantum Dots

“…Besides enhancing absorption, optical structures can also be used for better spectral resolution. By combining HgTe CQD photovoltaic sensors with distributed Bragg mirror filter array in a single device, Tang et al, reported a CQDs hyperspectral sensor [57], which realized acquisition of hyperspectral data with 64 narrowband channels and full-width at half-maxima down to 30 cm −1 , as shown in Figure 3h. Coatings 2020, 10, x FOR PEER REVIEW 6 of 14 In order to better reflect the development of infrared CQDs photodetectors, Table 1 shows the performance comparison between HgTe CQDs photodetectors over the past decade.…”

Copper Iron Sulfide Nanocrystal‐Bulk Silicon Heterojunctions for Broadband Photodetection

“…Efficient detection of photons lies at the heart of several modern technologies. [ 1 ] Although specialized high‐sensitivity detectors for specific wavelength ranges exist, [ 2–6 ] of late, there has been significant interest for the development of broadband photodetectors (PDs) for hyperspectral sensing. [ 7–12 ] Sensing over a very broad wavelength range is potentially very important for imaging applications, since it can enable for the identification of multiple parameters including morphology, temperature, chemical composition, etc.…”