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Research Output 1996 2019

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Article
2008

Optimization of photonic nanostructures

Frei, W. R., Johnson, H. T. & Tortorelli, D. A., Jul 1 2008, In : Computer Methods in Applied Mechanics and Engineering. 197, 41-42, p. 3410-3416 7 p.

Research output: Contribution to journalArticle

Photonics
Nanostructures
Photonic crystals
photonics
projection

Single impact crater functions for ion bombardment of silicon

Kalyanasundaram, N., Ghazisaeidi, M., Freund, J. B. & Johnson, H. T., Apr 10 2008, In : Applied Physics Letters. 92, 13, 131909.

Research output: Contribution to journalArticle

craters
bombardment
silicon
ions
ion impact

Statistical characterization of surface defects created by Ar ion bombardment of crystalline silicon

Ghazisaeidi, M., Freund, J. B. & Johnson, H. T., Sep 22 2008, In : Journal of Applied Physics. 104, 5, 054304.

Research output: Contribution to journalArticle

surface defects
bombardment
silicon
classifying
coordination number

Stress evolution to steady state in ion bombardment of silicon

Kalyanasundaram, N., Wood, M., Freund, J. B. & Johnson, H. T., Jan 1 2008, In : Mechanics Research Communications. 35, 1-2, p. 50-56 7 p.

Research output: Contribution to journalArticle

Silicon
Ion bombardment
bombardment
Argon
silicon

Three-dimensional nanostructures formed by single step, two-photon exposures through elastomeric Penrose quasicrystal phase masks

Shir, D., Liao, H., Jeon, S., Xiao, D., Johnson, H. T., Bogart, G. R., Bogart, K. H. A. & Rogers, J. A., Aug 1 2008, In : Nano letters. 8, 8, p. 2236-2244 9 p.

Research output: Contribution to journalArticle

Quasicrystals
layouts
Masks
Nanostructures
masks
2007

Carbon nanotube electronic displacement encoder with sub-nanometer resolution

Jiang, H., Yu, M. F., Lu, J. Q., Huang, Y., Johnson, H. T., Zhang, X. G. & Ferreira, P. M., May 2007, In : Journal of Computational and Theoretical Nanoscience. 4, 3, p. 574-577 4 p.

Research output: Contribution to journalArticle

Carbon Nanotubes
coders
Encoder
Nanotubes
Lattice constants

Effect of screw dislocation density on optical properties in n -type wurtzite GaN

You, J. H. & Johnson, H. T., Mar 13 2007, In : Journal of Applied Physics. 101, 2, 023516.

Research output: Contribution to journalArticle

screw dislocations
wurtzite
photoluminescence
optical properties
voids
Edge dislocations
edge dislocations
wurtzite
Photoluminescence
photoluminescence

Geometry projection method for optimizing photonic nanostructures

Frei, W. R., Tortorelli, D. A. & Johnson, H. T., Jan 1 2007, In : Optics Letters. 32, 1, p. 77-79 3 p.

Research output: Contribution to journalArticle

topology
projection
photonics
optimization
geometry

Quantum confinement induced strain in quantum dots

Zhang, X., Sharma, P. & Johnson, H. T., Apr 16 2007, In : Physical Review B - Condensed Matter and Materials Physics. 75, 15, 155319.

Research output: Contribution to journalArticle

Quantum confinement
Semiconductor quantum dots
quantum dots
electronic structure
Electronic structure
2006

Electron scattering due to threading edge dislocations in n-type wurtzite GaN

You, J. H., Lu, J. Q. & Johnson, H. T., Feb 1 2006, In : Journal of Applied Physics. 99, 3, 033706.

Research output: Contribution to journalArticle

edge dislocations
wurtzite
electron scattering
scattering
electron mobility

Moments-based tight-binding calculations of local electronic structure in InAs/GaAs quantum dots for comparison to experimental measurements

Lu, J. Q., Johnson, H. T., Dasika, V. D. & Goldman, R. S., Feb 10 2006, In : Applied Physics Letters. 88, 5, p. 1-3 3 p., 053109.

Research output: Contribution to journalArticle

quantum dots
electronic structure
moments
energy bands
scanning tunneling microscopy

Stress evolution due to medium-energy ion bombardment of silicon

Kalyanasundaram, N., Moore, M. C., Freund, J. B. & Johnson, H. T., Jan 1 2006, In : Acta Materialia. 54, 2, p. 483-491 9 p.

Research output: Contribution to journalArticle

Silicon
Ion bombardment
Ions
Argon
Relaxation processes

Transformation of hydrogel-based inverse opal photonic sensors from FCC to L11 during swelling

Lee, Y. J., Heitzman, C. E., Frei, W. R., Johnson, H. T. & Braun, P. V., Oct 5 2006, In : Journal of Physical Chemistry B. 110, 39, p. 19300-19306 7 p.

Research output: Contribution to journalArticle

Optics and Photonics
Hydrogel
Hydrogels
swelling
Photonics
2005
Silicon
mechanical properties
Ions
continuums
Mechanical properties

Random-walk statistics in moment-based O(N) tight binding and applications in carbon nanotubes

Schuyler, A. D., Chirikjian, G. S., Lu, J. Q. & Johnson, H. T., Apr 1 2005, In : Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 71, 4, 046701.

Research output: Contribution to journalArticle

Tight-binding
Nanotubes
random walk
Random walk
Carbon

Structural trends interpretation of the metal-to-semiconductor transition in deformed carbon nanotubes

Lu, J. Q., Wu, J., Duan, W., Gu, B. L. & Johnson, H. T., Jun 30 2005, In : Journal of Applied Physics. 97, 11, 114314.

Research output: Contribution to journalArticle

nanotubes
carbon nanotubes
trends
metals
sublattices

Topology optimization of a photonic crystal waveguide termination to maximize directional emission

Frei, W. R., Tortorelli, D. A. & Johnson, H. T., Mar 14 2005, In : Applied Physics Letters. 86, 11, p. 1-3 3 p., 111114.

Research output: Contribution to journalArticle

topology
photonics
waveguides
optimization
nonlinear programming
2004

Crystallite coalescence during film growth based on improved contact mechanics adhesion models

Suh, A. Y., Yu, N., Lee, K. M., Polycarpou, A. A. & Johnson, H. T., Aug 1 2004, In : Journal of Applied Physics. 96, 3, p. 1348-1359 12 p.

Research output: Contribution to journalArticle

coalescing
adhesion
tensile stress
crystallites
radii

Electron transport in deformed carbon nanotubes

Johnson, H. T., Liu, B. & Huang, Y. Y., Jul 1 2004, In : Journal of Engineering Materials and Technology, Transactions of the ASME. 126, 3, p. 222-229 8 p.

Research output: Contribution to journalArticle

Carbon Nanotubes
Nanotubes
Carbon nanotubes
nanotubes
carbon nanotubes

Finite-element analysis of disorder effects in photonic crystals [40]

Frei, W. R. & Johnson, H. T., Oct 1 2004, In : Physical Review B - Condensed Matter and Materials Physics. 70, 16, p. 1-11 11 p., 165116.

Research output: Contribution to journalArticle

Photonic crystals
disorders
photonics
Finite element method
Waveguides
Silicon
Ion bombardment
Sputtering
bombardment
sputtering

The influence of mechanical deformation on the electrical properties of single wall carbon nanotubes

Liu, B., Jiang, H., Johnson, H. T. & Huang, Y., Jan 1 2004, In : Journal of the Mechanics and Physics of Solids. 52, 1, p. 1-26 26 p.

Research output: Contribution to journalArticle

Carbon nanotubes
Electric properties
carbon nanotubes
electrical properties
conduction
2003

Simulation evidence for lateral excitation transfer in a self-assembled quantum-dot array

Johnson, H. T., Bose, R., Robinson, H. D. & Goldberg, B. B., May 19 2003, In : Applied Physics Letters. 82, 20, p. 3382-3384 3 p.

Research output: Contribution to journalArticle

quantum dots
excitation
near fields
simulation
wave functions

Stress generation mechanisms in carbon thin films grown by ion-beam deposition

Zhang, S., Johnson, H. T., Wagner, G. J., Liu, W. K. & Hsia, K. J., Oct 6 2003, In : Acta Materialia. 51, 17, p. 5211-5222 12 p.

Research output: Contribution to journalArticle

Carbon films
Ion beams
Vacancies
Thin films
Compressive stress
2002

Elimination of stress-induced curvature in thin-film structures

Bifano, T. G., Johnson, H. T., Bierden, P. & Mali, R. K., Oct 1 2002, In : Journal of Microelectromechanical Systems. 11, 5, p. 592-597 6 p.

Research output: Contribution to journalArticle

Ion beams
Machining
Thin films
Thin film devices
Amorphization

Simulated self-assembly and optoelectronic properties of InAs/GaAs quantum dot arrays

Johnson, H. T., Nguyen, V. & Bower, A. F., Oct 15 2002, In : Journal of Applied Physics. 92, 8, p. 4653-4663 11 p.

Research output: Contribution to journalArticle

self assembly
quantum dots
optical spectrum
optical absorption
absorption spectra
2001

Influence of strain on confined electronic states in semiconductor quantum structures

Johnson, H. T. & Freund, L. B., Feb 2001, In : International Journal of Solids and Structures. 38, 6-7, p. 1045-1062 18 p.

Research output: Contribution to journalArticle

Electronic states
Semiconductors
Electronics
Semiconductor materials
electronics

Influence of strain on functional characteristics of nanoelectronic devices

Freund, L. B. & Johnson, H. T., Sep 1 2001, In : Journal of the Mechanics and Physics of Solids. 49, 9, p. 1925-1935 11 p.

Research output: Contribution to journalArticle

Nanoelectronics
Schrodinger equation
Electronic states
crystal lattices
Crystal lattices
Quantum confinement
Wave functions
Semiconductor quantum dots
quantum dots
Hamiltonians

Simulations of quantum confinement in self-assembled InAs/GaAs island quantum dot arrays

Johnson, H. T., Nguyen, V. & Bower, A. F., Jan 1 2001, In : Materials Research Society Symposium - Proceedings. 642, p. J1.9.1-J1.9.6

Research output: Contribution to journalArticle

Quantum confinement
Wave functions
Semiconductor quantum dots
quantum dots
Hamiltonians
1998

Finite element analysis of strain effects on electronic and transport properties in quantum dots and wires

Johnson, H. T., Freund, L. B., Akyüz, C. D. & Zaslavsky, A., Oct 1 1998, In : Journal of Applied Physics. 84, 7, p. 3714-3725 12 p.

Research output: Contribution to journalArticle

quantum wires
transport properties
quantum dots
resonant tunneling
electronics
1997

Mechanics of coherent and dislocated island morphologies in strained epitaxial material systems

Johnson, H. T. & Freund, L. B., May 1 1997, In : Journal of Applied Physics. 81, 9, p. 6081-6090 10 p.

Research output: Contribution to journalArticle

edge dislocations
aspect ratio
arcs
energy
relieving