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5 Mar 2012

Volume 100, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 100, 101903 (2012); http://dx.doi.org/10.1063/1.3673327 (3 pages)

Michael Ian Lapsley, Anaram Shahravan, Qingzhen Hao, Bala Krishna Juluri, Stephen Giardinelli, Mengqian Lu, Yanhui Zhao, I-Kao Chiang, Themis Matsoukas, and Tony Jun Huang
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Optical transition induced by molecular transformation in peptide nanostructures

Nadav Amdursky, Amir Handelman, and Gil Rosenman

Appl. Phys. Lett. 100, 103701 (2012); http://dx.doi.org/10.1063/1.3691254 (4 pages) | Cited 1 time

Online Publication Date: 5 March 2012

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In this letter we present a variation in the optical properties of bio-organic peptide nanostructures, which are induced by molecular transformation. The self-assembled tubular structures are formed from short aromatic di-peptides. Upon thermal induction, the structure changes its molecular conformation, and the linear di-peptide closes into a cyclic peptide. This irreversible transition changes the molecular packing at the nanoscale, which results in reconstruction of the native quantum dot-like packing to quantum well-like packing and the generation of blue luminescence. We further show that the same cyclic peptide can exhibit different photoluminescence properties according to the formed structure.
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87.15.mq Luminescence
33.15.Bh General molecular conformation and symmetry; stereochemistry
81.16.Dn Self-assembly
87.14.ef Peptides
87.15.B- Structure of biomolecules
87.15.hp Conformational changes

Artificial DNA nanostructure detection using solution-processed In-Ga-Zn-O thin-film transistors

Si Joon Kim, Byeonghoon Kim, Joohye Jung, Doo Hyun Yoon, Junwye Lee, Sung Ha Park, and Hyun Jae Kim

Appl. Phys. Lett. 100, 103702 (2012); http://dx.doi.org/10.1063/1.3692587 (4 pages) | Cited 3 times

Online Publication Date: 7 March 2012

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A method for detecting artificial DNA using solution-processed In-Ga-Zn-O (IGZO) thin-film transistors (TFTs) was developed. The IGZO TFT had a field-effect mobility (μFET) of 0.07 cm2/Vs and an on-current (Ion) value of about 2.68 μA. A dry-wet method was employed to immobilize double-crossover (DX) DNA onto the IGZO surface. After DX DNA immobilization, significant decreases in μFET (0.02 cm2/Vs) and Ion (0.247 μA) and a positive shift of threshold voltage were observed. These results were attributed to the negatively charged phosphate groups on the DNA backbone, which generated electrostatic interactions in the TFT device.
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87.14.gk DNA
87.80.-y Biophysical techniques (research methods)
85.30.Tv Field effect devices

Investigation of vertical cavity surface emitting laser dynamics for neuromorphic photonic systems

A. Hurtado, K. Schires, I. D. Henning, and M. J. Adams

Appl. Phys. Lett. 100, 103703 (2012); http://dx.doi.org/10.1063/1.3692726 (4 pages) | Cited 1 time

Online Publication Date: 7 March 2012

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We report an approach based upon vertical cavity surface emitting lasers (VCSELs) to reproduce optically different behaviors exhibited by biological neurons but on a much faster timescale. The technique proposed is based on the polarization switching and nonlinear dynamics induced in a single VCSEL under polarized optical injection. The particular attributes of VCSELs and the simple experimental configuration used in this work offer prospects of fast, reconfigurable processing elements with excellent fan-out and scaling potentials for use in future computational paradigms and artificial neural networks.
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42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems
42.62.Be Biological and medical applications
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
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