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Linear dichroism

About: Linear dichroism is a(n) research topic. Over the lifetime, 2816 publication(s) have been published within this topic receiving 75228 citation(s). more


Open accessJournal ArticleDOI: 10.1038/NCOMMS5475
Jingsi Qiao1, Xianghua Kong1, Zhixin Hu1, Feng Yang1  +1 moreInstitutions (1)
Abstract: Two-dimensional crystals are emerging materials for nanoelectronics. Development of the field requires candidate systems with both a high carrier mobility and, in contrast to graphene, a sufficiently large electronic bandgap. Here we present a detailed theoretical investigation of the atomic and electronic structure of few-layer black phosphorus (BP) to predict its electrical and optical properties. This system has a direct bandgap, tunable from 1.51 eV for a monolayer to 0.59 eV for a five-layer sample. We predict that the mobilities are hole-dominated, rather high and highly anisotropic. The monolayer is exceptional in having an extremely high hole mobility (of order 10,000 cm(2) V(-1) s(-1)) and anomalous elastic properties which reverse the anisotropy. Light absorption spectra indicate linear dichroism between perpendicular in-plane directions, which allows optical determination of the crystalline orientation and optical activation of the anisotropic transport properties. These results make few-layer BP a promising candidate for future electronics. more

Topics: Phosphorene (57%), Electron mobility (56%), Anisotropy (54%) more

3,004 Citations

Journal ArticleDOI: 10.1126/SCIENCE.1060810
Jiangtao Hu1, Liang-shi Li1, Weidong Yang1, Liberato Manna1  +2 moreInstitutions (2)
15 Jun 2001-Science
Abstract: Colloidal quantum rods of cadmium selenide (CdSe) exhibit linearly polarized emission. Empirical pseudopotential calculations predict that slightly elongated CdSe nanocrystals have polarized emission along the long axis, unlike spherical dots, which emit plane-polarized light. Single-molecule luminescence spectroscopy measurements on CdSe quantum rods with an aspect ratio between 1 and 30 confirm a sharp transition from nonpolarized to purely linearly polarized emission at an aspect ratio of 2. Linearly polarized luminescent chromophores are highly desirable in a variety of applications. more

Topics: Linear dichroism (62%), Quantum dot (58%), Cadmium selenide (56%) more

1,075 Citations

Book ChapterDOI: 10.1016/0076-6879(95)46006-3
Abstract: Publisher Summary Circular dichroism (CD) is a spectroscopic method which depends on the fact that certain molecules interact differently with right and left circularly polarized light. Circularly polarized light is chiral—that is, it occurs in two nonsuperimposable forms that are mirror images of one another. To discriminate between the two chiral forms of light, a molecule must be chiral, including the vast majority of biological molecules. A method that can discern the subtle differences between non superimposable mirror image molecules (enantiomers) must be highly sensitive to the three-dimensional features of molecules—that is, to conformation. Binding of ligands or protein-protein and protein–DNA interactions can also alter the circular dichroism spectrum of the protein and/or nucleic acid. These changes in CD can be used to determine equilibrium constants, and they can also provide evidence for conformational changes. Thus, CD can provide information about the secondary structure of proteins and nucleic acids and about the binding of ligands to these types of macromolecule. more

913 Citations

Open accessJournal ArticleDOI: 10.1038/NNANO.2015.112
Hongtao Yuan1, Xiaoge Liu1, Farzaneh Afshinmanesh1, Wei Li1  +18 moreInstitutions (3)
Abstract: The ability to detect light over a broad spectral range is central to practical optoelectronic applications and has been successfully demonstrated with photodetectors of two-dimensional layered crystals such as graphene and MoS2. However, polarization sensitivity within such a photodetector remains elusive. Here, we demonstrate a broadband photodetector using a layered black phosphorus transistor that is polarization-sensitive over a bandwidth from ∼400 nm to 3,750 nm. The polarization sensitivity is due to the strong intrinsic linear dichroism, which arises from the in-plane optical anisotropy of this material. In this transistor geometry, a perpendicular built-in electric field induced by gating can spatially separate the photogenerated electrons and holes in the channel, effectively reducing their recombination rate and thus enhancing the performance for linear dichroism photodetection. The use of anisotropic layered black phosphorus in polarization-sensitive photodetection might provide new functionalities in novel optical and optoelectronic device applications. The anisotropic optical properties of black phosphorus can be exploited to fabricate photodetectors with linear dichroism operating over a broad spectral range. more

Topics: Photodetector (55%), Photodetection (55%), Polarization (waves) (52%) more

762 Citations

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Topic's top 5 most impactful authors

Bengt Nordén

167 papers, 8.6K citations

Alison Rodger

62 papers, 2.5K citations

Josef Michl

35 papers, 500 citations

Jens Spanget-Larsen

33 papers, 296 citations

Seog K. Kim

31 papers, 1K citations

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