A self-operating broadband spectrometer on a droplet

Malara, P.; Giorgini, A.; Avino, S.; Sarno, Valentina Di; Aiello, Roberto; Maddaloni, P.; Natale, P. De; Gagliardi, G.

doi:10.1038/s41467-020-16206-8

Cited by 16 publications

(14 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aside from difficulties in integration with planar light sources, a drawback of these devices is that the spectral resolution is limited by the maximum optical path length difference (OPD) allowed by the actuator travel range (60), which in turn is constrained by, for instance, the pull-in effect (whereby, below a threshold separation, the mirrors will uncontrollably and rapidly attract together) (2,6). Very recently, it has been demonstrated that the evaporation of a droplet atop the end of an optical fiber can also function as a system analogous to a scanning FT spectrometer, to obtain the absorption spectra of liquid analytes (61).…”

Section: Fourier Transform Microspectrometersmentioning

confidence: 99%

Miniaturization of optical spectrometers

Yang

Albrow-Owen

Cai

et al. 2021

Science

504

263

View full text Add to dashboard Cite

Spectroscopic analysis is one of the most widely used analytical tools in scientific research and industry. Although laboratory benchtop spectrometer systems offer superlative resolution and spectral range, their miniaturization is crucial for applications where portability is paramount or where in situ measurements must be made. Advancement in this field over the past three decades is now yielding microspectrometers with performance and footprint near those viable for lab-on-a-chip systems, smartphones, and other consumer technologies. We summarize the technologies that have emerged toward achieving these aims—including miniaturized dispersive optics, narrowband filter systems, Fourier transform interferometers, and reconstructive microspectrometers—and discuss the challenges associated with improving spectral resolution while device dimensions shrink ever further.

show abstract

Section: Fourier Transform Microspectrometersmentioning

confidence: 99%

Miniaturization of optical spectrometers

Yang

Albrow-Owen

Cai

et al. 2021

Science

504

263

View full text Add to dashboard Cite

show abstract

“…As noted above, a feature of the analysis of the optical properties of condensed media is the need to obtain spectra with the least distortion, since it is necessary to solve ill-posed inverse problems. Due to the small size of the C12880MA and C11708MA spectrometers, their spectral resolution r(λ) is limited and is about 9 nm and 14 nm, respectively [22,23]. Although in many practical problems of analyzing the properties of condensed media this resolution may be sufficient, the problem of analyzing the possibilities of improving the equivalent spectral resolution of the considered microspectrometers obtained by using digital processing of the recorded spectra remain urgent [24].…”

Section: Improvement Of Equivalent Spectral Resolution Using Wiener F...mentioning

confidence: 99%

“…Moreover, in order not to distort the shape of the instrumental function, it is necessary to use a measurement circuit that is equivalent to the circuit for recording spectra S(λ) of diffusely scattered radiation. The numerical aperture NA of the considered spectrometers is equal to 0.22 [22,23], and the corresponding angle α = 2•arcsin(NA) ≈ 26 • . Radiation fluxes in the solid angle Ω shown in Figure 2 participate in the formation of the spectrum S(λ).…”

Section: Equipment For Spectra Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the Possibility of Using Microspectrometers Based on CMOS Photodiode Arrays in Small-Sized Devices for Optical Diagnostics

Hotra

Firago

Levkovich

et al. 2022

Sensors

View full text Add to dashboard Cite

The article considers the potential applicability of C12880MA and C11708MA Hamamatsu microspectrometers, which are characterized by an extremely compact design, occupying a small volume of several cubic centimeters, in portable spectrometric equipment with spatial resolution for monitoring the optical properties of condensed scattering media. The development of methods for determining the reduced scattering and absorption spectral coefficients of radiation from various scattering materials and products allows us to speak about the possibility of real-time control of the volume concentration of optically active components included in them, for example, fat and water in dairy products. For this, it is necessary to provide sufficiently accurate spectra of diffusely reflected broadband light radiation at different distances between the points of radiation entrance and registration. The aim of the manuscript is to assess the possibility of using the considered microspectrometers in compact devices for optical diagnostics and control of the optical properties of condensed scattering media. The features of the connection diagram of these microspectrometers and the necessary methods for correcting the initially obtained spectral dependencies of diffusive reflection, which will be of interest to developers of spectral diagnostic equipment, are considered in detail. The need to eliminate the influence of the inhomogeneity of dark counts of a CMOS photodiode array is shown. The hardware functions of the C12880MA and C11708MA Hamammatsu microspectrometers, as well as the AvaSpec 2048L fiber-optic spectrometer, were experimentally measured and compared. Methods for correcting the nonlinearity of their reading scales and light characteristics, as well as improving their equivalent spectral resolution using digital Wiener filtering, are described. It is shown that the equivalent spectral resolution of C12880MA and C11708MA microspectrometers can be improved by about 40% when recording smooth spectra, subject to the condition that the resulting side oscillations are small. It is pointed out that in order to reduce the level of side oscillations in the corrected spectra with improved resolution, it is necessary to ensure the smoothness of the original spectra and a good signal-to-noise ratio. A conclusion is made about the possibility of using the considered microspectrometers in portable spectrometric equipment with careful consideration of their characteristics, the features of their switching circuit, and the necessary software.

show abstract

“…Miniaturized spectrometers show ultracompact footprint, portability, and integrability and thus possess great potential in the applications of in situ analysis systems, on-chip spectroscopy characterizations, hyperspectral imaging, etc . − Significant efforts have been devoted to realize miniaturization of spectrometers, such as miniaturized dispersive optics, narrow-band filter systems, Fourier transform microspectrometers, and computational spectrum reconstruction. − Among these approaches, spectrum reconstruction using filter-free photodetectors based on semiconductor materials with different band gaps is one of the most promising methods for spectral analysis. For instance, Yang et al reported a microspectrometer with a graded-band-gap CdS x Se 1– x nanowire, whose footprint was reduced to around 100 μm .…”

Section: Introductionmentioning

confidence: 99%

Spectrum Reconstruction with Filter-Free Photodetectors Based on Graded-Band-Gap Perovskite Quantum Dot Heterojunctions

Wang

Chen

Liu

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Spectrum reconstruction with filter-free microspectrometers has attracted much attention owing to their promising potential in in situ analysis systems, on-chip spectroscopy characterizations, hyperspectral imaging, etc. Further efforts in this field can be devoted to improving the performance of microspectrometers by employing high-performance photosensitive materials and optimizing the reconstruction algorithms. In this work, we demonstrate spectrum reconstruction with a set of photodetectors based on graded-band-gap perovskite quantum dot (PQD) heterojunctions using both calculation and machine learning algorithms. The photodetectors exhibit good photosensitivities with nonlinear current−voltage curves, and the devices with different PQD band gaps show various spectral responsivities with different cutoff wavelength edges covering the entire visible range. Reconstruction performances of monochromatic spectra with the set of PQD photodetectors using two different algorithms are compared, and the machine learning method achieves relatively better accuracy. Moreover, the nonlinear current−voltage variation of the photodetectors can provide increased data diversity without redundancy, thus further improving the accuracy of the reconstructed spectra for the machine learning algorithm. A spectral resolution of 10 nm and reconstruction of multipeak spectra are also demonstrated with the filter-free photodetectors. Therefore, this study provides PQD photodetectors with the corresponding optimized algorithms for emerging flexible microspectrometer systems.

show abstract

A self-operating broadband spectrometer on a droplet

Cited by 16 publications

References 27 publications

Miniaturization of optical spectrometers

Miniaturization of optical spectrometers

Investigation of the Possibility of Using Microspectrometers Based on CMOS Photodiode Arrays in Small-Sized Devices for Optical Diagnostics

Spectrum Reconstruction with Filter-Free Photodetectors Based on Graded-Band-Gap Perovskite Quantum Dot Heterojunctions

Contact Info

Product

Resources

About