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Projects/Programs

    Displaying 1 - 16 of 16

    Far infrared remote sensing

    Ongoing
    The Total Solar Irradiance and the outgoing Earth radiance are long term measurements that have been monitored from space for over 40 years. Microfabricated, absolutely calibrated bolometers with vertically-aligned carbon nanotubes that are developed by this project provide a more accurate and more

    Femtosecond Nonlinear Optical Spectroscopy of Nanoscale Materials

    Ongoing
    The purpose of this project is to develop and refine spectroscopic techniques based on nonlinear optics for the study of novel materials. Measurements that isolate the nonlinear response are often better able to uncover physical processes that, in the linear response, are subtle and hard to isolate

    Fiber Sources and Applications Background Information

    Ongoing
    NIST has been a world leader in lasers since the technology's development in the early 1960s, a tradition continued when NIST scientist John L. Hall shared the 2005 Nobel Prize in physics for his part in the invention of the optical frequency comb. The output of a comb is a brief broadband pulse

    Fiber-optic Frequency Comb Development

    Ongoing
    Frequency combs have found a wide range of applications beyond just optical metrology. Applications include laser ranging, precision molecular spectroscopy in the lab and over the air, optical timing distribution, low-noise microwave generation and support for optical clocks. All these applications

    GaN Nanowire Growth

    Ongoing
    Selective epitaxy: We have demonstrated that the diameter and placement of nanowires can be controlled by using silicon nitride (SiNx) masks on top of MBE-grown buffer layers (see figure). With electron beam lithography, several patterns with 3 mm die size that provide over 100,000 controlled

    GaN Nanowire Metrology and Applications

    Ongoing
    GaN Nanowire LEDs: Our selective epitaxy methods and dopant characterization techniques have enabled fabrication of arrays of nanowire LEDs with controlled location and spatial layout. This development is complemented by modeling of the carrier flow and recombination. These LEDs were combined to

    High-Power Laser Applications

    Ongoing
    Measurement challenges Traditional measurements of laser power or energy involve absorbing the laser light and measuring the resulting temperature increase of the absorber. However, as the power and total energy delivered by these lasers increases, thermal management, absorber size, and response

    Integrated Near-field Optoelectronic (INFO) Scanning Probe

    Ongoing
    In a collaboration between the Nanoelectromagnetics Project and the Quantitative Imaging Project, we have fabricated and tested a GaN nanowire mounted on an AFM tip as a near-field scanning microwave microscopy (NSMM ) tip (see Fig. 2(a) below ). A tungsten atomic layer deposition (ALD) coating

    Nanostructure Fabrication and Metrology

    Completed
    This project develops semiconductor nanostructures, especially self-assembled quantum dots and photonic crystals, for a variety of applications including single photonics, laser diodes, and quantum optical metrology. It also develops quantum optical metrology based on other sources and detectors

    Photonic Radiometry

    Ongoing
    Meeting the needs of the photonics industry and anticipating emerging technologies requires investigation and development of improved measurement methods and instrumentation. This project develops state-of-art, absolute microfabricated thermal detectors with absorber coatings consisting of carbon

    Quantum Radiometry

    Ongoing
    For quantum applications, it is important to generate quantum states of light and detect them with extremely high efficiency. This project explores the metrology challenges associated with precision measurement of single photon sources and detectors. The classical photonic radiometry techniques used

    Single Photonics and Quantum Information

    Ongoing
    One of the activities in this group is the development of single photon technologies for quantum information science and technology. We work closely with the Nanostructure Fabrication and Metrology Project on the generation of novel non-classical states of light and the detection of single photons

    Super-Continuum Laser Solar Simulator

    Completed
    The design of the super-continuum solar simulator is shown below. Light is produced from 450 nm to 2400 nm in sub-nanosecond pulses at a repetition rate of 80 MHz. The total irradiance is sufficient to illuminate a 1 cm 2 cell at more than 1-sun. Initial tests have confirmed that solar cells respond

    Terahertz Imaging and Sources

    Ongoing
    Over the past several years, we have focused on bolometric detection of THz radiation. Our initial work on cryogenic detectors has been extended to antenna-coupled bolometers operating at room temperature. These detectors provide a rugged, low-cost alternative for homeland security applications; e.g

    Waveform Metrology Project

    Ongoing
    Optical measurement techniques: NIST uses the electro-optic sampling (EOS) technique to measure the vector response of photodiodes and provide phase traceability for commercial instrumentation, such as large-signal network analyzers, lightwave component analyzers, vector signal analyzers