category » Optics & Photonics

Reducing Recombination Losses in Planar Organic Photovoltaic Cells Using Multiple Step Charge Separation
  • Organic photovoltaics (OPVs) are promising low-cost solar cells: they can be stacked in multi-junctions, and they are compatible with roll-to-roll…


Anomalous Singlet Exciton Fission Magnetic Field Effect in Diphenyltetracene-C60 Solar Cells
  • Singlet exciton fission may find application in more efficient solar cells. Fission can reduce thermalization losses because by splitting the…


Integration of Superconducting Microwave Resonators with Molecular Ion Traps
  • Over the last decade, quantum information experiments with trapped ions have demonstrated essential steps towards quantum computing and quantum simulation…


Timing Performance of Superconducting Nanowire Avalanche Photodetectors
  • Superconducting nanowire avalanche photodetectors (SNAPs) [1] are based on a parallel architecture that performs single-photon counting with higher signal-to-noise ratio…


20-fold Enhancement of Molecular Fluorescence by Coupling to a J-aggregate Critically Coupled Resonator
  • The efficient absorption and emission of light is of fundamental importance to the operation of optoelectronic devices such as solid-state…


Polariton Lasing by Intra-cavity Pumping and Applications to Ultra-fast Switching
  • The strongly coupled states of light and matter in microcavities known as polaritons offer exciting possibilities for the study of…


Transparent Organic Photovoltaics for Window Applications
  • The low energy density of solar illumination necessitates deployment of solar technologies over large surface areas in order to capture…


Phosphor Sensitized Quantum-dot Light-emitting Diodes
  • Colloidal quantum-dot light-emitting diodes (QD-LEDs) combine the thin film processability of organic materials with the tunable optical properties conferred by…


Ultrahigh Resolution Fluorescence Microscope Utilizing a J-aggregate Critically Coupled Resonator
  • The non-destructive chemical mapping of surfaces with single-molecule sensitivity and sub-5-nm lateral resolution is an extraordinary challenge. Optical techniques such…


Development of Terahertz Quantum-cascade Lasers
  • The terahertz frequency range (1-10 THz) has long remained undeveloped, mainly due to the lack of compact, coherent radiation sources….


CNT-based Optoelectronic Device Packaging
  • Carbon nanotubes (CNTs) are excellent heat spreaders for packaging electronic/photonic devices due to their high thermal conductivity and good mechanical…


Watt-class Optoelectronic Oscillators
  • We are investigating the performance of low-noise, high-power optoelectronic oscillators (OEO) using all slab-coupled optical waveguide (SCOW) components. The optoelectronic…


Nonlinear Optics in CMOS photonics
  • Nonlinear optics comprises a rich body of physics that could enable a number of interesting functionalities in integrated silicon photonics…


CMOS Photonics
  • Low propagation loss deposited waveguides are an important component to enable photonic integration in the majority of high-volume electronics processes….


Thermal Energy Harvesting Light Sources
  • We are investigating thermoelectric transport in light-emitting diodes (LEDs). Electro-luminescent cooling is a phenomenon in which the optical output power…


Wearable Thermoelectric Generators
  • There exists great interest in the utilization of the human body as a possible power supply for running such electronics…


Indium Phosphide Plasmonics
  • Surface plasmon polaritons (SPPs) are optical waves that propagate at the interface between a metal and a dielectric, and can…


Integrated Optical Isolators
  • We have experimentally demonstrated a monolithically integrated ultra-compact optical isolator on silicon. This device uses a different design strategy from…


Magnetooptical and Magnetic Oxides for Optical Isolators and Magnetoelectronic Devices
  • We maintain a thin-film laboratory that includes a pulsed-laser deposition (PLD) system and an ultra-high vacuum sputter system. The PLD…


Self-assembly of Triblock Terpolymers
  • Triblock terpolymers are interesting because they can form a much wider diversity of 3D structures than diblock copolymers, including rings…


Near-ultraviolet Sensor Based on Horizontal Low-Temperature Solution-Grown Zinc Oxide Nanowires
  • A near-ultraviolet (UV) sensor based on zinc oxide (ZnO) nanowires (NWs) that is sensitive to photo excitation at or below…


Single-Photon Detection with Ultranarrow Superconducting Nanowires
  • Superconducting nanowire single-photon detectors (SNSPDs) [1] perform single-photon counting in the near‑infrared with outstanding performance. The main limitations of standard…


Dielectric Aperiodic Nanostructured Luneburg Lens at Optical Frequencies
  • Luneburg lens is a gradient index (GRIN) element [1] known to produce diffraction-limited focus at the lens edge opposite to…


Templated Placement of Colloidal Quantum Dots
  • Semiconductor quantum dots (QDs) are electronically-quantized systems with promising applications in optoelectronic devices [1] . A key aspect of such…


Triplet Exciton Dynamics in Tetracene Versus Rubrene Crystals
  • Exciton transport is universal in every kind of organic optoelectronic devices – including organic light-emitting diodes (OLEDs) and organic solar…


Cascaded Energy Transfer for Efficient Broadband Pumping of High-quality Micro-lasers
  • Many on-chip optical applications, including spectroscopy [1] ; sensing [2] [3] ; nonlinear optics [4] [5] [6] ; and optical…


Effect of Electron Spin on OPV Recombination
  • Organic photovoltaics (OPVs) are promising low-cost solar cells: they can be stacked in multi-junctions, and they are compatible with roll-to-roll…


Nanostructured Gradient-Index Antireflection Diffractive Optics
  • In recent years there has been significant interest in broadband, omnidirectional antireflection (AR) nanostructures that minimize Fresnel reflection due to…


Co-axial Integration of III-V Ridge-waveguide Laser Diodes with SiOxNy Waveguides on Silicon
  • Our ongoing research integrating 1.55-µm III-V ridge waveguide gain elements (i.e., diode lasers and semiconductor optical amplifiers) co-axially aligned with…


High Channel-count Silicon Neural Recording Probes for 3-D Characterization of Neural Dynamics
  • Optogenetics is commonly used for precision modulation of the activity of specific neurons within neural circuits [1] , but assessing…


Magnetically-assisted Assembly, Alignment, and Orientation of Micro-scale Components
  • The use of magnetic forces to improve fluidic self-assembly of micro-components has been investigated using Maxwell 3D to model the…


Recess Integration of Vertical-cavity Surface-emitting Laser Pills and Edge-emitting Laser Platelets on Si
  • Optoelectronic devices intimately integrated on silicon integrated circuits have long been sought for optical intercon-nect applications, optical communications modules, and–more…


Waveguide Micro-probes for Optical Control of Excitable Cells
  • Professor Ed Boyden uses light to precisely control neural activity.  His lab has invented safe, effective ways to deliver light-gated…