Circular Spectropolarimetric Sensing of Vegetation in the Field: Possibilities for the Remote Detection of Extraterrestrial Life

Patty, C.H. Lucas; Kate, I. L. ten; Buma, Wybren Jan; Spanning, Rob J.M. van; Steinbach, Gábor; Ariese, Freek; Snik, Frans

doi:10.1089/ast.2019.2050

Cited by 29 publications

(21 citation statements)

References 53 publications

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“…In addition to spectroscopy, circular polarimetry can search for direct detection of extrasolar ‘vegetation’ analogues [15]. Although we do not propose this as a goal, we are also open to the exploration of possible technosignatures (e.g.…”

Section: Science Objectivesmentioning

confidence: 99%

OWL-Moon in 2050 and beyond

Silk

Vakili

2020

Phil. Trans. R. Soc. A.

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We address three major questions in astronomy, namely the detection of biosignatures on habitable exoplanets, the geophysics of exoplanets and cosmology. To achieve this goal, two requirements are needed: (i) a very large aperture to detect spectro-polarimetric and spatial features of faint objects such as exoplanets, (ii) continuous monitoring to characterize the temporal behaviour of exoplanets such as rotation period, meteorology and seasons. An Earth-based telescope is not suited for continuous monitoring and the atmosphere limits the ultimate angular resolution and spectro-polarimetrical domain. Moreover, a space telescope in orbit is limited in aperture, to perhaps 15 m over many decades. This is why we propose an OWL-class lunar telescope with a 50–100 m aperture for visible and IR astronomy, based on ESO's Overwhelmingly Large Telescope concept, unachievable on Earth for technical issues such as wind stress that are not relevant for a lunar platform. It will be installed near the south pole of the Moon to allow continuous target monitoring. The low gravity of the Moon will facilitate its building and manoeuvring, compared to Earth-based telescopes. We introduce a new original idea: such a large lunar telescope will allow Intensity Interferometric measurements when coupled with large Earth-based telescopes, leading to picosecond angular resolution. Rather than going into all details, our objective is essentially to inject new ideas and give a kind of roadmap. In particular, the choice of a final location will have to find a compromise between the cool temperature of craters at the Moon South Pole and the visibility of Earth for some science objectives. This article is part of a discussion meeting issue ‘Astronomy from the Moon: the next decades’.

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Section: Science Objectivesmentioning

confidence: 99%

OWL-Moon in 2050 and beyond

Silk

Vakili

2020

Phil. Trans. R. Soc. A.

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“…The footprint of spinach chloroplasts was used to determine the presence of chiral aggregates inside of the chloroplasts themselves and to determine the radius and pitch of such features by comparing results with simulations [ 103 ]. A recent application of CD for characterizing the absorption/scattering spectrum of the chloroplast is the remote identification of such macromolecules in vegetation up to distances of a few kilometers [ 104 ].…”

Section: Cids Microscopy Configurationmentioning

confidence: 99%

Circular Intensity Differential Scattering for Label-Free Chromatin Characterization: A Review for Optical Microscopy

2020

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Circular Intensity Differential Scattering (CIDS) provides a differential measurement of the circular right and left polarized light and has been proven to be a gold standard label-free technique to study the molecular conformation of complex biopolymers, such as chromatin. In early works, it has been shown that the scattering component of the CIDS signal gives information from the long-range chiral organization on a scale down to 1/10th–1/20th of the excitation wavelength, leading to information related to the structure and orientation of biopolymers in situ at the nanoscale. In this paper, we review the typical methods and technologies employed for measuring this signal coming from complex macro-molecules ordering. Additionally, we include a general description of the experimental architectures employed for spectroscopic CIDS measurements, angular or spectral, and of the most recent advances in the field of optical imaging microscopy, allowing a visualization of the chromatin organization in situ.

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“…Over the last few decades, it has shown its efficiency in multiple areas showcasing its particular sensitivity to the medium structure and orientation [2]. As follows, it has been referred to a wide range of experimental applications from astrophysics [3,4], remote target detection [5][6][7][8], and micro/nanoparticles in a turbid or highly scattering medium [9][10][11][12][13][14]. Especially, Mueller matrix polarimetry is the most comprehensive method as it provides the full polarimetric response of a sample through its 4 × 4 Mueller matrix (MM).…”

Section: Introductionmentioning

confidence: 99%

Review on Complete Mueller Matrix Optical Scanning Microscopy Imaging

et al. 2021

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Optical scanning microscopy techniques based on the polarization control of the light have the capability of providing non invasive label-free contrast. By comparing the polarization states of the excitation light with its transformation after interaction with the sample, the full optical properties can be summarized in a single 4×4 Mueller matrix. The main challenge of such a technique is to encode and decode the polarized light in an optimal way pixel-by-pixel and take into account the polarimetric artifacts from the optical devices composing the instrument in a rigorous calibration step. In this review, we describe the different approaches for implementing such a technique into an optical scanning microscope, that requires a high speed rate polarization control. Thus, we explore the recent advances in term of technology from the industrial to the medical applications.

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Circular Spectropolarimetric Sensing of Vegetation in the Field: Possibilities for the Remote Detection of Extraterrestrial Life

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Cited by 29 publications

References 53 publications

OWL-Moon in 2050 and beyond

OWL-Moon in 2050 and beyond

Circular Intensity Differential Scattering for Label-Free Chromatin Characterization: A Review for Optical Microscopy

Review on Complete Mueller Matrix Optical Scanning Microscopy Imaging

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