Passive optical waveguiding tubular pharmaceutical solids and Raman spectroscopy/mapping of nano-/micro-scale defects

Chandrasekhar, N.; Reddy, E. Ramanjaneya; Prasad, M. Durga; Rajadurai, Marina; Chandrasekar, Rajadurai

doi:10.1039/c4ce00084f

Cited by 17 publications

(9 citation statements)

References 22 publications

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“…[57] Considering the negligible overlap between absorption and emission bands of A, the optical loss can be attributed to surface roughness and defects. [58] In order to test the efficacy of welded crystals as optical waveguides, a series of homowelded crystals of A-A-A-A-A composition were prepared, as described above (Figure 2; Section S1, Supporting Information), and their performance in transduction of light was compared to that of mechanically coupled A crystals. Both welded and coupled crystals were excited at one end and their photoluminescence intensity maps were recorded.…”

Section: Resultsmentioning

confidence: 99%

Sequencing and Welding of Molecular Single‐Crystal Optical Waveguides

Catalano

Berthaud

Dushaq

et al. 2020

Adv Funct Materials

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Molecular crystals are promising anisotropic optical transducing media for next‐generation optoelectronic microdevices that will be capable of secure transduction of information and impervious to external electromagnetic interference. However, their full potential has not been explored yet due to their poor processability, low mechanical compliance, pronounced brittleness and high proneness to cracking that often result in irrecoverable damage. These issues are detrimental to their ability to transduce light. Here, a novel strategy is presented based on 3D epitaxial crystal growth of organic/inorganic crystals based on charge‐assisted hydrogen bonds that can be used to efficiently weld broken molecular single‐crystalline optical waveguides and restore their light‐transducing capability. This approach can also be applied to prepare asymmetric multidomain crystalline heterostructures starting from isostructural molecular tectons, resulting in novel opto/electro/mechanical functionalities in the hybrid materials. It also removes an important obstacle toward wider application of molecular crystals in the next‐generation optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Sequencing and Welding of Molecular Single‐Crystal Optical Waveguides

Catalano

Berthaud

Dushaq

et al. 2020

Adv Funct Materials

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“…Nano-and microscale organic solids [1][2][3][4] are emerging as promising photonic materials to realize miniaturized device applications such as wave guides, [3][4][5][6][7][8][9][10][11] lasers, [ 12,13 ] resonators, [ 14,15 ] circuits, [ 16 ] and optical fi lters. [ 17 ] In the next level of complexity, responsive organic solids which can change their shape and dimensions with respect to external perturbation are known to exhibit switchable photonic properties.…”

Section: Doi: 101002/adom201500106mentioning

confidence: 99%

Photonic Microrods Composed of Photoswitchable Molecules: Erasable Heterostructure Waveguides for Tunable Optical Modulation

Venkatakrishnarao

Mohiddon

Chandrasekhar

et al. 2015

Advanced Optical Materials

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102

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“…The studies have focused on the demonstration of passive (transmission of unaltered input light) and active (transmission of fluorescence) transduction of visible light, which has been already demonstrated for a number of organic crystalline materials 2 – 28 . The mechanical compliance observed with some of these elastic and plastic materials is unprecedented and impressive 7 – 12 , although intentional (for applications that require bending of the light beam) or unintentional (due to accident or damage) deformation of their crystals is usually accompanied with accumulation of defects 20 . Although their shape can be recovered, the defects result in proneness to wear and fatigue, and decrease drastically the optical transmittance after multiple deformations.…”

Section: Introductionmentioning

confidence: 99%

Mechanically robust amino acid crystals as fiber-optic transducers and wide bandpass filters for optical communication in the near-infrared

Karothu¹,

Dushaq²,

Ahmed³

et al. 2021

Nat Commun

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Organic crystals are emerging as mechanically compliant, light-weight and chemically versatile alternatives to the commonly used silica and polymer waveguides. However, the previously reported organic crystals were shown to be able to transmit visible light, whereas actual implementation in telecommunication devices requires transparency in the near-infrared spectral range. Here we demonstrate that single crystals of the amino acid L-threonine could be used as optical waveguides and filters with high mechanical and thermal robustness for transduction of signals in the telecommunications range. On their (00$$\bar 1$$ 1 ¯ ) face, crystals of this material have an extraordinarily high Young’s modulus (40.95 ± 1.03 GPa) and hardness (1.98 ± 0.11 GPa) for an organic crystal. First-principles density functional theory calculations, used in conjunction with analysis of the energy frameworks to correlate the structure with the anisotropy in the Young’s modulus, showed that the high stiffness arises as a consequence of the strong charge-assisted hydrogen bonds between the zwitterions. The crystals have low optical loss in the O, E, S and C bands of the spectrum (1250−1600 nm), while they effectively block infrared light below 1200 nm. This property favors these and possibly other related organic crystals as all-organic fiber-optic waveguides and filters for transduction of information.

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Passive optical waveguiding tubular pharmaceutical solids and Raman spectroscopy/mapping of nano-/micro-scale defects

Cited by 17 publications

References 22 publications

Sequencing and Welding of Molecular Single‐Crystal Optical Waveguides

Sequencing and Welding of Molecular Single‐Crystal Optical Waveguides

Photonic Microrods Composed of Photoswitchable Molecules: Erasable Heterostructure Waveguides for Tunable Optical Modulation

Mechanically robust amino acid crystals as fiber-optic transducers and wide bandpass filters for optical communication in the near-infrared

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