Richard Riman

Rutgers, The State University of New Jersey, Materials Science and Engineering, Faculty Member

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Address: Piscataway, New Jersey, United States

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Synthesis and spectroscopic characterization of CaF2:Er3+ single crystal for highly efficient 1.53 μm amplification

Journal of Applied Physics, Mar 18, 2004

A CaF2:Er3+ single crystal was grown by the Tammann–Stober method. The potential of this material... more A CaF2:Er3+ single crystal was grown by the Tammann–Stober method. The potential of this material as a laser crystal for 1530 nm emission was established by quantitative analysis of the optical absorption and emission spectra. Assuming the tetragonal symmetry of the Er3+ sites, the Bkq crystal field parameters, Racah parameters, spin–orbit interaction parameters, and configuration interaction parameters were derived by fitting the experimental absorption band positions with the model energy Hamiltonian. Judd–Ofelt parametrization was done to compute the radiative decay time and fluorescence branching ratio of various meta stable transitions. Using the measured fluorescence decay time and computed radiative decay time, 100% quantum efficiency is obtained for the 1530 nm band, which is reasonable due to the low multiphonon relaxation, and absence of nonradiative energy transfer processes at the 0.01 at.% Er3+ concentration. The narrow bandwidth (13 nm) and high stimulated emission cross section (3.2×10−20 cm2) support the suitability of CaF2:Er3+ for use in high gain optical amplifiers.

Heterometallic Chalcogenido Clusters Containing Lanthanides and Main Group Metals: Emissive Precursors to Ternary Solid-State Compounds

ChemInform, Jan 10, 2006

Heterometallic clusters containing lanthanides and the group 12 metals can be isolated as crystal... more Heterometallic clusters containing lanthanides and the group 12 metals can be isolated as crystalline compounds in high yields. These products [(py)8Ln4M2Se6(SePh)4 (Ln ) Er, Yb, Lu; M ) Cd, Hg)] adopt a double cubane structure with the covalent M occupying an opposing pair of external metal sites. Both Er/M compounds are strongly emissive materials, with emission lifetimes of 1.41 ms (Er/Cd) and 0.71 ms (Er/Hg) and with the Er/Cd radiative quantum efficiency twice that of the Er/Hg compound. Thermal decomposition of the Er/Cd and Yb/Cd compounds at 650 °C give the ternary solid-state materials CdLn2Se4.

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(INVITED) On the evolution of nanoparticles in nanoparticle-doped optical fibers

Optical Materials: X

In-situ ATR-IR monitoring of hydrothermal carbonation of wollastonite

Vibrational Spectroscopy

$Research paper thumbnail of In-situ X-ray diffraction carbonation of cementitious silicates$

In-situ X-ray diffraction carbonation of cementitious silicates

5th International Conference on Accelerated Carbonation for Environmental and Material Engineering 2015, 2015

Multifunctional Rare Earth-Based Biophotonic Composites

A Multi-Scale Approach to Modeling of Particle Assemblies in Materials

Journal of the Ceramic Society of Japan, 2004

複合エマルションでの界面反応法におけるヒドロキシアパタイト・ミクロスフィアの調製( 水溶液科学に立脚したセラミックス合成プロセス)

The role of the chemical processing variables for the synthesis of ideal alkoxy-derived SrTiO₃ powder

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineerin... more

Matières composites biomimétiques d'hydroxyapatite et procédés pour leur préparation

La presente invention concerne des procedes pour preparer des matieres composites, qui comprennen... more

Production de corps monolithiques à partir d'une matrice poreuse par solidification à basse température dans un processus de fabrication additive

Procede de production d'un corps monolithique a partir d'une matrice poreuse comprenant l... more

$Research paper thumbnail of Refractive Index Tuning of Hybrid Materials for Highly Transmissive Luminescent Lanthanide Particle-Polymer Composites$

Refractive Index Tuning of Hybrid Materials for Highly Transmissive Luminescent Lanthanide Particle-Polymer Composites

ACS applied materials & interfaces, Jan 14, 2018

High-refractive-index ZrOnanoparticles were used to tailor the refractive index of a polymer matr... more High-refractive-index ZrOnanoparticles were used to tailor the refractive index of a polymer matrix to match that of luminescent lanthanide-ion-doped (LaYbErF) light-emitting particles, thereby reducing scattering losses to yield highly transparent emissive composites. Photopolymerization of blends of an amine-modified poly(ether acrylate) oligomer and tailored quantities of ZrOnanoparticles yielded optically transparent composites with tailored refractive indices between 1.49 and 1.69. By matching the refractive index of the matrix to that of LaYbErF, composites with high transmittance (>85%) and low haze from the visible to infrared regions, bright 1530 nm optical emissions were achieved at solids loadings of LaYbErF, ranging from 5 to 30 vol %. These optical results suggest that a hybrid matrix approach is a versatile strategy for the fabrication of functional luminescent optical composites of high transparency.

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Rare-earth doped nanocomposites enable multiscale targeted short-wave infrared imaging of metastatic breast cancer

SPIE Proceedings, 2017

We are investigating the ability of targeted rare earth (RE) doped nanocomposites to detect and t... more We are investigating the ability of targeted rare earth (RE) doped nanocomposites to detect and track micrometastatic breast cancer lesions to distant sites in pre-clinical in vivo models. Functionalizing RE nanocomposites with AMD3100 promotes targeting to CXCR4, a recognized marker for highly metastatic disease. Mice were inoculated with SCP-28 (CXCR4 positive) and 4175 (CXCR4 negative) cell lines. Whole animal in vivo SWIR fluorescence imaging was performed after bioluminescence imaging confirmed tumor burden in the lungs. Line-scanning confocal fluorescence microscopy provided high-resolution imaging of RE nanocomposite uptake and native tissue autofluorescence in ex vivo lung specimens. Co-registered optical coherence tomography imaging allowed assessment of tissue microarchitecture. In conclusion, multiscale optical molecular imaging can be performed in pre-clinical models of metastatic breast cancer, using targeted RE-doped nanocomposites.

Early detection and longitudinal imaging of cancer micrometastases using biofunctionalized rare-earth albumin nanocomposites

Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 2016

Success of personalized medicine in cancer therapy depends on the ability to identify and molecul... more Success of personalized medicine in cancer therapy depends on the ability to identify and molecularly phenotype tumors. Current clinical imaging techniques cannot be integrated with precision molecular medicine at the level of single cells or microlesions due to limited resolution. In this work we use molecularly targeted infrared emitting optical probes to identify and characterize metastatic microlesions prior to their detection with clinically relevant imaging modalities. These contrast agents form the basis of an in vivo optical imaging system capable of resolving internal microlesions, filling a critical unmet need in cancer imaging.

Reactive Hydrothermal Liquid‐Phase Densification (rHLPD) of Ceramics – A Study of the BaTiO3[TiO2] Composite System

Journal of the American Ceramic Society, 2016

A densification process called reactive hydrothermal liquid‐phase densification (rHLPD), based on... more A densification process called reactive hydrothermal liquid‐phase densification (rHLPD), based on principles of hydrothermal reaction, infiltration, reactive crystallization, and liquid‐phase sintering, is presented. rHLPD can be used to form monolithic ceramic components at low temperatures. The densification of barium titanate–titania composite monoliths was studied to demonstrate proof of concept for this densification model. Permeable, green titania (anatase) compacts were infiltrated with aqueous barium hydroxide solutions and reacted under hydrothermal conditions in the temperature range 90°C–240°C. The effects of reaction time and temperature on the conversion of titania (anatase) into barium titanate were studied. Utilizing a 72 h reaction at 240°C between l.0 M Ba(OH)2, an anatase (TiO2) powder compact, and a corresponding Ba/Ti ratio of 1.5, it was possible to crystallize a composite 95 wt% (88 mol%) BaTiO3 and 5 wt% (12 mol%) TiO2. The composite had a relative density of ...

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Biomimetic Hydroxyapatite Synthesis

Biomimetic hydroxyapatite synthesis

Single-Crystal-Like Materials

Biomimetic hydroxyapatite synthesis

Ir-Activated Photoelectric Systems

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