A Near‐Infrared Miniature Quantum Dot Spectrometer

Abstract

The acquisition of near‐infrared (NIR) spectral information is most notably accessed in the scientific analysis and industrial technology. With the development of artificial intelligence technology, miniature NIR spectrometers are usually required to realize compact equipment. Quantum dot spectrometer is demonstrated to be a promising reconstructive spectrometer; however, the spectral range is limited in the visible range due to the lack of high‐resolution NIR detectors and quantum dot filters. In this work, a NIR quantum dot spectrometer is constructed by integrating 195 finely spectra‐tunable PbS and PbSe based NIR quantum dots as filters and a NIR complementary metal‐oxide semiconductor as detector. The spectra‐tunable PbS and PbSe quantum dots are achieved by controlling the key parameters of colloidal synthesis, ligand exchange, and cation exchange. Combined with the compressive‐sensing based total‐variation algorithm, the NIR quantum dot spectrometer reaches an average spectral resolution of 6 nm in the wide spectral range of 900–1700 nm, showing the bright prospect in developing compact NIR spectrometer for artificial intelligence technology.

Mass production-enabled computational spectrometers based on multilayer thin films

“…However, these uses are restricted to research and development due to limitations based on the spectrometers’ bulky size, high cost, and long measuring time. There have been tremendous efforts to overcome spectrometer limitations and go beyond restricted applications 4 – 21 . One promising candidate to achieve this is optical filter array-based spectrometers: complementary metal–oxide–semiconductor (CMOS) image sensors with a filter array used as a spectrometer.…”

“…The spectral resolution in conventional filter array-based spectrometers has been improved using computational approaches. New optical filter types have been proposed that work well in computational approaches and achieve further improvements 6 – 8 , 10 , 11 , 13 , 14 , 16 , 21 . Unlike conventional optical filters, which selectively transmit incident light in specific wavelengths and reflect the remaining wavelengths, these filters, called random spectral filters, modulate and transmit incident light with unique spectral features in the entire wavelength ranges of interest.…”

“…Unlike conventional optical filters, which selectively transmit incident light in specific wavelengths and reflect the remaining wavelengths, these filters, called random spectral filters, modulate and transmit incident light with unique spectral features in the entire wavelength ranges of interest. Various types of random spectral filters have been proposed, such as etalon filters 10 , 11 , 20 , quantum dot filters 8 , 21 , photonic crystal slabs 7 , 9 , 14 , 16 , and multilayer thin films (MTF) filters 6 , 13 . The spectral resolvability of computational spectroscopy has been successfully demonstrated using random spectral filters with low correlation among filters.…”

Friction-Induced Clustered Rearrangement at a PbS Quantum Dot Nanocoating via Long-Term Lubrication under an Atmosphere Environment

“…With the rapid development of nanoscience and nanotechnology, a unique type of quasi-zero-dimensional functional nanomaterial named quantum dots (QDs) has attracted a great deal of attention in the scientific community. Based on the remarkable optical and semiconducting properties, − QDs have been widely utilized in excitation-based optoelectronic devices such as colloidal solar cells, , fluorescence probes, , and light-emitting diodes. , Also, QDs have been successfully used in the mechanical engineering field as solid lubricants via the transferred lubricating films generated by physical or chemical reactions of sliding-contact interfaces. Previous tribological studies on QDs primarily focus on those derived from two-dimensional (2D) layered materials such as graphene − QDs, transition metal dichalcogenide QDs, as well as black phosphorus (BP) QDs.…”

Influence of Ink Properties on the Morphology of Long-Wave Infrared HgSe Quantum Dot Films

“…In addition to the QD's unique optical properties, it also has the advantages of low cost, multiple types, and easy integration. Therefore, people have used QDs as filter materials to prepare visible-light (Vis) and near-infrared (NIR) filter film arrays and QD micro-spectrometers [24][25][26][27][28][29]. The existing filter films and their working bands are shown in Table 1.…”