Fabry-Pérot-multichannel spectrometer tandem for ultra-high resolution Raman spectroscopy

Rozas, G.; Jusserand, B.; Fainstein, A.

doi:10.1063/1.4861345

Cited by 9 publications

(14 citation statements)

References 28 publications

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“…Sellar and Boreman [44] proposed a windowing approach, distinct from the time-delay integration technique used by some panchromatic imagers. Fabry-Perot interferometer (FPI) hyperspectral imager was alternatively developed by [30] as a Raman spectroscopy device [52] behaving like a single shot imager, since it acquires the whole 2D-plane at once. The data processing steps related with this sensor are described in [53].…”

Section: Spectral Information Spatial Informationmentioning

confidence: 99%

Hyperspectral Imaging: A Review on UAV-Based Sensors, Data Processing and Applications for Agriculture and Forestry

et al. 2017

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Traditional imagery-provided, for example, by RGB and/or NIR sensors-has proven to be useful in many agroforestry applications. However, it lacks the spectral range and precision to profile materials and organisms that only hyperspectral sensors can provide. This kind of high-resolution spectroscopy was firstly used in satellites and later in manned aircraft, which are significantly expensive platforms and extremely restrictive due to availability limitations and/or complex logistics. More recently, UAS have emerged as a very popular and cost-effective remote sensing technology, composed of aerial platforms capable of carrying small-sized and lightweight sensors. Meanwhile, hyperspectral technology developments have been consistently resulting in smaller and lighter sensors that can currently be integrated in UAS for either scientific or commercial purposes. The hyperspectral sensors' ability for measuring hundreds of bands raises complexity when considering the sheer quantity of acquired data, whose usefulness depends on both calibration and corrective tasks occurring in pre-and post-flight stages. Further steps regarding hyperspectral data processing must be performed towards the retrieval of relevant information, which provides the true benefits for assertive interventions in agricultural crops and forested areas. Considering the aforementioned topics and the goal of providing a global view focused on hyperspectral-based remote sensing supported by UAV platforms, a survey including hyperspectral sensors, inherent data processing and applications focusing both on agriculture and forestry-wherein the combination of UAV and hyperspectral sensors plays a center role-is presented in this paper. Firstly, the advantages of hyperspectral data over RGB imagery and multispectral data are highlighted. Then, hyperspectral acquisition devices are addressed, including sensor types, acquisition modes and UAV-compatible sensors that can be used for both research and commercial purposes. Pre-flight operations and post-flight pre-processing are pointed out as necessary to ensure the usefulness of hyperspectral data for further processing towards the retrieval of conclusive information. With the goal of simplifying hyperspectral data processing-by isolating the common user from the processes' mathematical complexity-several available toolboxes that allow a direct access to level-one hyperspectral data are presented. Moreover, research works focusing the symbiosis between UAV-hyperspectral for agriculture and forestry applications are reviewed, just before the paper's conclusions.

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Section: Spectral Information Spatial Informationmentioning

confidence: 99%

Hyperspectral Imaging: A Review on UAV-Based Sensors, Data Processing and Applications for Agriculture and Forestry

et al. 2017

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“…To this aim we have used a purposely developed Raman spectroscopy technique based on a tandem Fabry-Perot triple spectrometer multichannel set-up. 33 The system is composed of a single-pass Fabry-Perot (FP) interferometer coupled to a T64000 Jobin-Yvon triple spectrometer operated in additive configuration. 33 The light to be analyzed is collected from the sample by a lens, filtered through the FP, and then focused by a second lens into the entrance slit of the spectrometer.…”

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Quantum well photoelastic comb for ultra-high frequency cavity optomechanics

Villafañe

Anguiano

Bruchhausen

et al. 2018

Quantum Sci. Technol.

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Optomechanical devices operated at their quantum limit open novel perspectives for the ultrasensitive determination of mass and displacement, and also in the broader field of quantum technologies. The access to higher frequencies implies operation at higher temperatures and stronger immunity to environmental noise. We propose and demonstrate here a new concept of quantum well photoelastic comb for the efficient electrostrictive coupling of light to optomechanical resonances at hundreds of GHz in semiconductor hybrid resonators. A purposely designed ultra-high resolution Raman spectroscopy set-up is exploited to evidence the transfer of spectral weight from the mode at 60 GHz to modes at 190-230 GHz, corresponding to the 8 th and 10 th overtone of the fundamental breathing mode of the light-sound cavities. The coupling to mechanical frequencies two orders of magnitude larger than alternative approaches is attained without reduction of the optomechanical constant g 0 . The wavelength dependence of the optomechanical coupling further proves the role of resonant photoelastic interaction, highlighting the potentiality to access strongcoupling regimes. The experimental results show that electrostrictive forces allow for the design of devices optimized to selectively couple to specific mechanical modes. Our proposal opens up exciting opportunities towards the implementation of novel approaches applicable in quantum and ultra-high frequency information technologies. a email:afains@cab.cnea.gov.ar 1 arXiv:1808.10029v2 [physics.optics] 19 Dec 2018Quantum coherent control of mechanical motion in atomic systems has been exploited since the early pioneering experiments with trapped ions. 1-5 Nano and micromechanical structures based on condensed matter devices extend these concepts with a great flexibility in design and the possibility to integrate different physical degrees of freedom. In addition, solid state devices allow the access to much higher mechanical frequencies, a critical requirement for quantum operation at higher temperatures and for the implementation of efficient ultrafast quantum information protocols. 6 The possibility to tailor the optical forces by sample design using material dependent electrostrictive forces was theoretically proposed in the context of waveguide optomechanics in Ref. 7. Here we propose and demonstrate through ultra-high resolution Raman spectroscopy, a quantum well photoelastic comb as a mean for the selective electrostrictive coupling of light to specific mechanical modes, and as a path to cavity optomechanics in the hundreds of GHz range, two orders of magnitude larger than alternative demonstrated technologies.Most cavity optomechanical devices operate with vibrational frequencies f m below or in the MHz range, with some designs pushing that limit to a few GHz. 6 Attaining higher mechanical frequencies without compromising other operational parameters is of critical relevance for various reasons. Firstly, to initialize a mechanical oscillator in the ground state at thermal equilibriu...

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“…In order to study the optomechanical vibrations of the DBR-based resonator we have developed such a tandem setup, improving the resolution of the Raman spectrometer more than one order of magnitude. This allows at the same time the high-resolution measurement of vibrations down to ≈0.01 cm −1 (a few tenths of a GHz), with no upper limit [28].…”

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confidence: 99%

“…As the resolution of the spectrometer is better than the FSR of the FP but not enough to resolve the width of the transmission peaks, the acquired spectrum consists of several broad resolution-limited peaks of which the relevant information is their integrated intensity. By repeating this procedure as a function of the gas pressure, we reconstruct the Raman profile [28]. The triple spectrometer is equipped with a liquid-N 2 cooled chargecoupled device (CCD) multichannel detector.…”

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confidence: 99%

“…3. The acquired spectra shown with a solid curve were obtained precisely in the same conditions as those in the top panel, with only the Fabry-Perot interferometer inserted in between the collection optics and the spectrometer, and by scanning the FP gas pressure to reconstruct the high-resolution Raman spectra as described above [28]. The richness of the spectra is striking: clear narrow cavity modes are observed precisely at the expected frequencies around 19 and 56 GHz, together with a broad contribution with fast oscillations at the high-energy edge of the Brillouin zone center modes around 38 GHz.…”

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Spectra of mechanical cavity modes in distributed Bragg reflector based vertical GaAs resonators

et al. 2014

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Distributed Bragg reflector based semiconductor resonators constitute paradigmatic systems where cavity optomechanical and optoelectronic phenomena can be simultaneously active in the same device. High GHz range mechanical frequencies and ultrastrong optomechanical couplings are additional attractive features for applications. We report here a detailed spectroscopic study of the fundamental optomechanical resonances of such a device. The existent challenge to study vibrational frequencies that are above the bandwidth of current electronics is solved using a purposely made tandem Fabry-Perot-triple spectrometer. A full theoretical description of the Raman process including electronic, vibrational, and optical confinement is presented to describe the experiments. These results open the path for the demonstration of polariton optomechanical phenomena in these devices.Distributed Bragg reflector (DBR) based microcavities combine the richness of novel optomechanical resonator phenomena [1-11], i.e., optomechanical nonlinearities, laser cooling [12][13][14][15], and phonon lasing [16,17], with the world of cavity optoelectronics, including controlled light emission and single-photon emitters [18], lasing [19,20], and polariton condensation [21].For the GaAs/AlAs family of materials a resonator structure based on distributed Bragg reflectors (DBRs) and designed to confine photons (i.e., an optical microcavity) efficiently confines acoustic phonons of the same wavelength, strongly enhancing their interaction [22,23]. Indeed, a "magic coincidence" determines that the materials index of refraction, mass density, and sound speed, the physical quantities that determine the optical and acoustic device performance, are such that precisely the same structure designed to optimally confine light with the largest optical Q factor (that is, field amplification) will optimally confine the phonons with the largest attainable acoustic Q factor (that is, resonant displacement and strain). These structures constitute optomechanical devices that can attain very high mechanical and optical Q factors (Q ∼ 10 5 ), very low mechanical effective masses (m eff ∼ pg), large optomechanical coupling factors (g om ∼ THz/nm), and ultrahigh vibrational frequencies (sub-THz) [22]. Based on the demonstrated record optomechanical coupling it was predicted that stimulated emission of GHz phonons should occur in pillars of a few micrometers diameter under laser pump powers in the micro-milliwatt range. Quite interestingly, the studied planar microcavities based on DBRs can be designed so that, even with almost perfect mirrors, the phonon extraction out of the cavity is highly efficient.One central feature to these unique DRB-based GaAs/AlAs optomechanical resonators is that precisely the same kind of structure is canonical to optoelectronic phenomena. In fact, the studied devices are based on the semiconductor vertical microcavity structures developed to demonstrate single-photon emitters, polariton condensates, and vertical * afains@cab.cnea.gov.ar cavi...

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Fabry-Pérot-multichannel spectrometer tandem for ultra-high resolution Raman spectroscopy

Cited by 9 publications

References 28 publications

Hyperspectral Imaging: A Review on UAV-Based Sensors, Data Processing and Applications for Agriculture and Forestry

Hyperspectral Imaging: A Review on UAV-Based Sensors, Data Processing and Applications for Agriculture and Forestry

Quantum well photoelastic comb for ultra-high frequency cavity optomechanics

Spectra of mechanical cavity modes in distributed Bragg reflector based vertical GaAs resonators

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