Components

Ramaswami, Rajiv; Sivarajan, Kumar N.; Sasaki, Galen H.

doi:10.1016/b978-0-12-374092-2.50011-4

Cited by 5 publications

(4 citation statements)

References 58 publications

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“…The image was evaluated with ImageJ. From the decay in the autofluorescence intensity along the waveguide, the optical loss was calculated as , No autofluorescence was excited by illuminating at 670 or 808 nm and, therefore, quantification of the optical loss with this method was not possible for those wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Printed Soft Optical Waveguides of PLA Copolymers for Guiding Light into Tissue

Feng

Jiang

Rogin

et al. 2020

ACS Appl. Mater. Interfaces

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The application of optical technologies in treating pathologies and monitoring disease states requires the development of soft, minimal invasive and implantable devices to deliver light to tissues inside the body. Here, we present soft and degradable optical waveguides from poly(d,l-lactide) and derived copolymers fabricated by extrusion printing in the desired dimensions and shapes. The obtained optical waveguides propagate VIS to NIR light in air and in tissue at penetration depths of tens of centimeters. Besides, the printed waveguides have elastomeric properties at body temperature and show softness and flexibility in the range relevant for implantable devices in soft organs. Printed waveguides were able to guide light across 8 cm tissue and activate photocleavage chemical reactions in a photoresponsive hydrogel (in vitro). The simplicity and flexibility of the fiber processing method and the optical and mechanical performance of the obtained waveguides exemplify how rational study of medically approved biomaterials can lead to useful inks for printing cost-effective and flexible optical components for potential use in medical contexts.

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Section: Resultsmentioning

confidence: 99%

Printed Soft Optical Waveguides of PLA Copolymers for Guiding Light into Tissue

Feng

Jiang

Rogin

et al. 2020

ACS Appl. Mater. Interfaces

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“…Furthermore, the need to convert information between the optical and electrical domains adds unwanted delays and power consumption. The ability to transmit and process information solely in the optical domain could help overcome these issues …”

Section: Introductionmentioning

confidence: 99%

Design of Organic Chromophores for All-Optical Signal Processing Applications

et al. 2013

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Organic materials possess many key attributes that make them suitable for exploitation in all-optical signal processing applications including facile tunability of their optical properties, strong and ultrafast nonlinear optical response, and potential for integration into device structures. In this perspective, we present molecular design guidelines for organic chromophores that could serve as the active constituents for such materials. Using a relatively simple model, a candidate class of chromophores, namely cyanine-like polymethines, is identified based on promising microscopic nonlinear optical properties in the near-IR spectral region. The challenges associated with translating these microscopic properties into materials with macroscopic properties suitable for device applications are presented along with molecular engineering approaches for overcoming these hurdles.

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“…As a result, in the past few years, materials possessing a high NLO response have emerged as promising candidates for the realization and development of photonic integrated devices, which can be exploited in optoelectronics and nanophotonics applications. − In particular, a strong interest in organic NLO materials has emerged due to their superior speed and responsive magnitude. − More recently, great efforts have been dedicated to the investigation of switchable molecular materials, the NLO response of which can be reversibly modulated by means of an external stimuli such as redox, pH, or light. − In the latter family of compounds, azobenzene (AB) and its derivatives represent one of the most important class of molecular switches that, through a light or heat induced stimuli, can selectively and reversibly isomerize from the trans ( E ) to the cis ( Z ) configuration and vice versa. − At the molecular level, the isomerization reaction dramatically modifies the spatial redistribution of the electron density and affects its polarizability, thus providing an efficient tool for controlling and inducing large variations of the molecular optical nonlinearities . In a very recent work, our groups reported on the NLO response of three different azobenzene derivatives 1 , 2 , and 3 (Figure a) bearing electron-donating moieties, as studied by means of the Z-scan technique employing picosecond laser excitation.…”

Section: Introductionmentioning

confidence: 99%

Substitution, Environment, and Excitation Wavelength Effects on the Optical Nonlinearities of Some Novel cis-/trans-π-Conjugated Azobenzenes

et al. 2014

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The transient nonlinear optical response of a series of highly π-conjugated 4,4′-diethynylazobenzene derivatives, symmetrically substituted with different electron-rich aromatic moieties (i.e., a N,N′-dihexylaniline, 4-ethynyl-(N,N′,dihexylaniline), and a Zn(II)-porphyrin fragment, respectively) is investigated by means of the Z-scan technique. The systematic study of their nonlinear optical properties, using 4 ns laser excitation, revealed that all molecules possess very large third-order nonlinearity excited at 532 nm, whereas only the aniline derivatives showed nonlinear optical (NLO) response under 1064 nm excitation. In-depth investigation, both in solutions and in thin films, established that the NLO response of these azobenzene (AB) derivatives is totally attributed to their high refractive nonlinearity, presenting negligible nonlinear absorption. These findings strongly suggest that these molecules can be exploited for the development of new materials suitable for photonic/optoelectronic devices, since their strong nonlinear refraction combined with the absence of any nonlinear absorption ensures low losses, very low heating of the organic material, and eventually longer operative lifetimes.

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Components

Cited by 5 publications

References 58 publications

Printed Soft Optical Waveguides of PLA Copolymers for Guiding Light into Tissue

Printed Soft Optical Waveguides of PLA Copolymers for Guiding Light into Tissue

Design of Organic Chromophores for All-Optical Signal Processing Applications

Substitution, Environment, and Excitation Wavelength Effects on the Optical Nonlinearities of Some Novel cis-/trans-π-Conjugated Azobenzenes

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