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Opto-Electronics

All-silicon lasers
Active and Passive WDMs
OEIC enabling technologies
Quantum Dots and Anti-Dots (lateral semiconductor superlattices made using Anodized Aluminum Oxide (AAO) templates, Reactive Ion Etching (RIE), and Molecular Beam Epitaxy (MBE))
Non-Linear Optics (NLO) studies of nano-materials
Preparation of stable, highly efficient NLO materials using AAO membranes
Low-dimensional semiconductor structures
Plasmonic chips (surface plasmon activity in low-dimensional metallic nanostructures)
Electo-optically active materials
Optical interactions between nanowires
Active and passive photonic devices
Heterostructures made of carbon nanotubes (CNTs) and semiconducting substrates

Normalized absorption spectra of periodic gold-nanodot arrays through surface plasmon resonance for different incidence angles.
Cloutier, S. G.

BSG (Binary Super Grating)
Cloutier, S. G.

PL spectrum of ZnO nanorods grown on GaN showing only the UV exciton peak; and on Si(100) showing the UV and defect-induced visible peak in the inset.

H. Chik, J. Liang, S. G. Cloutier, N. Kouklin, and J. M. Xu, "Periodic array of uniform ZnO nanorods by second-order self-assembly" Appl. Phys. Lett. 84, 3376-3378, (2004)

(a) Energy spectrum of a 32x32 array of nanowires (b) Top view of a typical metastable state of the array (c) Top view of the ground state

A. J. Bennett and J.M. Xu, "Simulating the magnetic susceptibility of magnetic nanowire arrays", Appl. Phys. Lett., 82(19), 3304-3306, 2003.

Current voltage characteristics of the CNT=Si structures at different temperatures. The same data are plotted in parts (a) and (b)

Schematic representation of the device structure.

Typical scanning electron microscopy image of the CNTs grown in the templates.

M. Tzolov, B. Chang, A. Yin, D. Straus, G. Brown, J.M. Xu, "Electronic transport in a controllably grown carbon nanotube-silicon heterojunction array", Phys. Rev. Lett., 92(7), 075505, 2004.

(a) Current–voltage characteristic of Y-junction CNTs. (b) Differential conductance of Y-junctions.

Double logarithmic plot of Y-junction differential conductance vs voltage for (a) positive bias and (b) negative bias.

(a) Diagram of Y-junction CNT geometry.
(b) Ratio of Y-junction conductance G(V)/ G(-V), for various temperatures.

C. Papadopoulos, A.J. Yin, and J.M. Xu, "Temperature-dependent studies of Y-junction carbon nanotube electronic transport", Appl. Phys. Lett. 85, 1769-1771, 2004.

Field alignment of a single nanorod

ZnO nanorod grown on a CNT with a zoomed in view of the
heterojunction

Field alignment of a group nanorod

ZnO nanorods aligned along the electric field lines

Schematic of field alignment between two probes

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Opto-Electronics

Normalized absorption spectra of periodic gold-nanodot arrays through surface plasmon resonance for different incidence angles.
Cloutier, S. G.

BSG (Binary Super Grating)
Cloutier, S. G.

PL spectrum of ZnO nanorods grown on GaN showing only the UV exciton peak; and on Si(100) showing the UV and defect-induced visible peak in the inset.

H. Chik, J. Liang, S. G. Cloutier, N. Kouklin, and J. M. Xu, "Periodic array of uniform ZnO nanorods by second-order self-assembly" Appl. Phys. Lett. 84, 3376-3378, (2004)

(a) Energy spectrum of a 32x32 array of nanowires (b) Top view of a typical metastable state of the array (c) Top view of the ground state

A. J. Bennett and J.M. Xu, "Simulating the magnetic susceptibility of magnetic nanowire arrays", Appl. Phys. Lett., 82(19), 3304-3306, 2003.

Current voltage characteristics of the CNT=Si structures at different temperatures. The same data are plotted in parts (a) and (b)

Schematic representation of the device structure.

Typical scanning electron microscopy image of the CNTs grown in the templates.

M. Tzolov, B. Chang, A. Yin, D. Straus, G. Brown, J.M. Xu, "Electronic transport in a controllably grown carbon nanotube-silicon heterojunction array", Phys. Rev. Lett., 92(7), 075505, 2004.

(a) Current–voltage characteristic of Y-junction CNTs. (b) Differential conductance of Y-junctions.

Double logarithmic plot of Y-junction differential conductance vs voltage for (a) positive bias and (b) negative bias.

(a) Diagram of Y-junction CNT geometry.
(b) Ratio of Y-junction conductance G(V)/ G(-V), for various temperatures.

C. Papadopoulos, A.J. Yin, and J.M. Xu, "Temperature-dependent studies of Y-junction carbon nanotube electronic transport", Appl. Phys. Lett. 85, 1769-1771, 2004.

Field alignment of a single nanorod

ZnO nanorod grown on a CNT with a zoomed in view of the
heterojunction

Field alignment of a group nanorod

ZnO nanorods aligned along the electric field lines

Schematic of field alignment between two probes

A three-terminal random network device
schematic

Chik, H (2004). Zinc Oxide Nanorods. PhD Thesis, Brown University, RI.

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Opto-Electronics

Normalized absorption spectra of periodic gold-nanodot arrays through surface plasmon resonance for different incidence angles. Cloutier, S. G.

BSG (Binary Super Grating) Cloutier, S. G.

PL spectrum of ZnO nanorods grown on GaN showing only the UV exciton peak; and on Si(100) showing the UV and defect-induced visible peak in the inset.

H. Chik, J. Liang, S. G. Cloutier, N. Kouklin, and J. M. Xu, "Periodic array of uniform ZnO nanorods by second-order self-assembly" Appl. Phys. Lett. 84, 3376-3378, (2004)

(a) Energy spectrum of a 32x32 array of nanowires (b) Top view of a typical metastable state of the array (c) Top view of the ground state

A. J. Bennett and J.M. Xu, "Simulating the magnetic susceptibility of magnetic nanowire arrays", Appl. Phys. Lett., 82(19), 3304-3306, 2003.

Current voltage characteristics of the CNT=Si structures at different temperatures. The same data are plotted in parts (a) and (b)

Schematic representation of the device structure.

Typical scanning electron microscopy image of the CNTs grown in the templates.

M. Tzolov, B. Chang, A. Yin, D. Straus, G. Brown, J.M. Xu, "Electronic transport in a controllably grown carbon nanotube-silicon heterojunction array", Phys. Rev. Lett., 92(7), 075505, 2004.

(a) Current–voltage characteristic of Y-junction CNTs. (b) Differential conductance of Y-junctions.

Double logarithmic plot of Y-junction differential conductance vs voltage for (a) positive bias and (b) negative bias.

(a) Diagram of Y-junction CNT geometry. (b) Ratio of Y-junction conductance G(V)/ G(-V), for various temperatures.

C. Papadopoulos, A.J. Yin, and J.M. Xu, "Temperature-dependent studies of Y-junction carbon nanotube electronic transport", Appl. Phys. Lett. 85, 1769-1771, 2004.

Field alignment of a single nanorod

ZnO nanorod grown on a CNT with a zoomed in view of the heterojunction

Field alignment of a group nanorod

ZnO nanorods aligned along the electric field lines

Schematic of field alignment between two probes

A three-terminal random network device schematic

Chik, H (2004). Zinc Oxide Nanorods. PhD Thesis, Brown University, RI.

Normalized absorption spectra of periodic gold-nanodot arrays through surface plasmon resonance for different incidence angles.
Cloutier, S. G.

BSG (Binary Super Grating)
Cloutier, S. G.

(a) Diagram of Y-junction CNT geometry.
(b) Ratio of Y-junction conductance G(V)/ G(-V), for various temperatures.

ZnO nanorod grown on a CNT with a zoomed in view of the
heterojunction

A three-terminal random network device
schematic