NER: Design and Study of non-Classical Optical

1. NER: Design and Study of non-Classical Optical Phenomena in Self-Assembled Nanophotonics Jeremy W. Galusha, Jacqueline T. Siy, Lauren R. Richey, and Michael H. Bartl* * Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 bartl@chem.utah.edu http://www.chem.utah.edu/directory/faculty/bartl.html NanoPhotonics Inverse Opal 3-D Photonic Crystals Photonic Band Structure Engineering Band structure calculations of symmetry-broken (10% compression along 111 axis) inverse opal show opening of the W gap at a lowered refractive index requirement of 2.79 for the high-dielectric component. PHOTONIC CRYSTALS are artificial periodic electromagnetic environments for which the band structure concepts of solid-state physics are applied to electromagnetism, resulting in formation of photonic stop and band gaps. The main research theme of the Bartl Group is to experimentally studynon-classicaloptical phenomena in nanophotonics. Lift Off and Flip Over Our fabrication technique results in planar titania inverse opals with a completely open surface without the need of additional patterning steps. Nanophotonics – the combination of nanotechnology with the use of photons as the main information carrier open a myriad of new possibilities for advanced information transfer and processing. Of special interest are photonic systems displaying non-classical optical properties, such as photonic band structure crystals and semiconductor nanocrystals (colloidal quantum dots, rods, etc.), which are considered key elements in next generation optical concepts such as photonic chips and all-optical integrated circuits. Galusha, Carter, Bartl, Mater. Res. Soc. Symp. Proc., 2006, 0988-QQ05-08. Post-Synthesis Nanocrystal Size Tuning Reflectance [a.u.] Wavelength [nm] Purified CdSe colloidal nanocrystal quantum dots undergo tunable size reduction without losing their luminescent properties upon reheating in the presence of fresh surface stabilizing ligands in non-coordinating solvents. The process relies on equilibrium chemistry by “reversing” the growth reaction given in a simplified form as: Cd-precursor + Se-precursor ↔ CdSe-nanocrystals + Ligands Galusha, Tsung, Stucky, Bartl, 2007, submitted. Natural Diamond-Based Photonic Crystals Factors affecting the degree of size reduction are the nanocrystal ratio to ligand, nanocrystal concentration, temperature and reaction time. Ligands used in the experiments are commonly-used ligands for QD synthesis such as octadecylamine (ODA), stearic acid (SA) and oleic acid (OA). Observations are supported by UV-vis absorption spectroscopy, PL spectroscopy and TEM images taken of the samples. Lamprocyphus augustus 3-D Structural Characterization by Sequential 30 nm FIB Milling/SEM Imaging DiamondPhotonic Crystal Structure Explore andstudy photonic band structures in biological systems. Utilize bio-inspired/bio-templating approaches to translate ‘natural’ photonic structures into ‘artificial’ material systems. Acknowledgements We thank Galen Stucky, Frank Tsung, Jennifer Cha, and John Gardner for valuable contributions and discussions. This work was partially supported by the National Science Foundation under Award No. ECS 0609244, by the Petroleum Research Foundation, and by start-up funds from the University of Utah.