Mr. Stergios J. Papadakis Profile

Stergios J. Papadakis

at Johns Hopkins Univ Applied Physics Lab

SPIE Involvement:

Author

Proceedings Article | 13 May 2019 Presentation + Paper

Carbon nanotube-based radiometers demonstrated on the RAVAN CubeSat mission

William Swartz, Stergios Papadakis, David Deglau, Steven Lorentz, Allan Smith, Philip Huang

Proceedings Volume 10982, 109820G (2019) https://doi.org/10.1117/12.2518428

KEYWORDS: Radiometry, Gallium, Black bodies, Calibration, Carbon, Carbon nanotubes, Sensors, Solar radiation, Solar energy

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Proceedings Article | 23 June 2014 Paper

The power of inexpensive satellite constellations

Lars Dyrud, Rose La Tour, William Swartz, Sreeja Nag, Steven Lorentz, Thomas Hilker, Warren Wiscombe, Stergios Papadakis

Proceedings Volume 9083, 90832A (2014) https://doi.org/10.1117/12.2053395

KEYWORDS: Satellites, Manufacturing, Sensors, Aerospace engineering, Satellite communications, Product engineering, Climate change, Carbon, Photosynthesis, Standards development

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Proceedings Article | 5 June 2014 Paper

Photon filter for energetic neutral atom detectors from carbon nanotubes

David Deglau, Donald Mitchell, Andrew Monica, Bruce Andrews, John Mattson, Stergios Papadakis

Proceedings Volume 9083, 90832D (2014) https://doi.org/10.1117/12.2051135

KEYWORDS: Particles, Sensors, Plasmas, Chemical species, Carbon nanotubes, Optical filters, Iron, Thin films, Sun, Spectroscopy

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Proceedings Article | 3 May 2012 Paper

Nanowire-based surface-enhanced Raman spectroscopy (SERS) for chemical warfare simulants

J. Hoffmann, J. Miragliotta, J. Wang, P. Tyagi, T. Maddanimath, D. Gracias, S. Papadakis

Proceedings Volume 8373, 837323 (2012) https://doi.org/10.1117/12.920777

KEYWORDS: Surface enhanced Raman spectroscopy, Sensors, Raman spectroscopy, Molecules, Spectrometers, Silver, Electrodes, Spectroscopes, Nanowires

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Proceedings Article | 13 May 2011 Paper

A micro-fabricated sheet-beam Orotron THz source

S. Papadakis, J. Hoffmann, A. Monica, D. Deglau, J. Yu, T. Antonsen, G. Nusinovich, R. Osiander

Proceedings Volume 8031, 80310C (2011) https://doi.org/10.1117/12.884158

KEYWORDS: Terahertz radiation, Electrons, Magnetism, Electron beams, Microfabrication, Imaging spectroscopy, Carbon nanotubes, Explosives, Silicon, Optical alignment

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Proceedings Article | 31 August 2010 Paper

Multiwalled carbon nanotubes for stray light suppression in space flight instruments

John Hagopian, Stephanie Getty, Manuel Quijada, June Tveekrem, Ron Shiri, Patrick Roman, James Butler, Georgi Georgiev, Jeff Livas, Cleophus Hunt, Alejandro Maldonado, Saikat Talapatra, Xianfeng Zhang, Stergios Papadakis, Andrew Monica, David Deglau

Proceedings Volume 7761, 77610F (2010) https://doi.org/10.1117/12.864386

KEYWORDS: Stray light, Mirrors, Reflectivity, Carbon nanotubes, Silicon, Bidirectional reflectance transmission function, Aerospace engineering, Nanoimprint lithography, Stray light control, Light scattering

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Observations of the Earth are extremely challenging; its large angular extent floods scientific instruments with high flux within and adjacent to the desired field of view. This bright light diffracts from instrument structures, rattles around and invariably contaminates measurements. Astrophysical observations also are impacted by stray light that obscures very dim objects and degrades signal to noise in spectroscopic measurements. Stray light is controlled by utilizing low reflectance structural surface treatments and by using baffles and stops to limit this background noise. In 2007 GSFC researchers discovered that Multiwalled Carbon Nanotubes (MWCNTs) are exceptionally good absorbers, with potential to provide order-of-magnitude improvement over current surface treatments and a resulting factor of 10,000 reduction in stray light when applied to an entire optical train. Development of this technology will provide numerous benefits including: a.) simplification of instrument stray light controls to achieve equivalent performance, b.) increasing observational efficiencies by recovering currently unusable scenes in high contrast regions, and c.) enabling low-noise observations that are beyond current capabilities. Our objective was to develop and apply MWCNTs to instrument components to realize these benefits. We have addressed the technical challenges to advance the technology by tuning the MWCNT geometry using a variety of methods to provide a factor of 10 improvement over current surface treatments used in space flight hardware. Techniques are being developed to apply the optimized geometry to typical instrument components such as spiders, baffles and tubes. Application of the nanostructures to alternate materials (or by contact transfer) is also being investigated. In addition, candidate geometries have been tested and optimized for robustness to survive integration, testing, launch and operations associated with space flight hardware. The benefits of this technology extend to space science where observations of extremely dim objects require suppression of stray light.

Proceedings Article | 5 May 2010 Paper

A flat laser array aperture

Stergios Papadakis, Gerald Ricciardi, Michael Gross, Jerry Krill

Proceedings Volume 7666, 76661S (2010) https://doi.org/10.1117/12.850593

KEYWORDS: Waveguides, Electrodes, Phased array optics, Brain-machine interfaces, Electro optics, Optical arrays, Phased arrays, Atmospheric turbulence, Free space optical communications, Polymers

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Proceedings Article | 27 April 2010 Paper

Orotron-based sub-millimeter-wave source

Stergios Papadakis, Joan Hoffmann, Andrew Monica, David Deglau, J. Yu, Gregory Nusinovich, Thomas Antonsen, Robert Osiander

Proceedings Volume 7670, 76700O (2010) https://doi.org/10.1117/12.850470

KEYWORDS: Magnetism, Electron beams, Imaging systems, Image resolution, Carbon nanotubes, Fabrication, Microfabrication, Optical design, Silicon, Electrodes

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Proceedings Article | 12 May 2009 Paper

Scanning surface-enhanced Raman spectroscopy (SERS) of chemical agent simulants on templated Au-Ag nanowire substrates

J. Hoffmann, J. Miragliotta, J. Wang, P. Tyagi, T. Maddanimath, D. Gracias, S. Papadakis

Proceedings Volume 7318, 73180D (2009) https://doi.org/10.1117/12.818818

KEYWORDS: Surface enhanced Raman spectroscopy, Sensors, Spectroscopy, Raman spectroscopy, Molecules, Silver, Chemical analysis, Gold, Nanowires

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Proceedings Article | 4 May 2007 Paper

Carbon-nanotube field-emitter driven compact frequency-scanning THz source

S. Papadakis, A. Monica, J. Yu, J. Miragliotta, R. Osiander, T. Antonsen, G. Nusinovich

Proceedings Volume 6549, 65490N (2007) https://doi.org/10.1117/12.722953

KEYWORDS: Terahertz radiation, Electrons, Electron beams, Electrodes, Silicon, Imaging spectroscopy, Metals, Explosives, Particles, Semiconducting wafers

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Proceedings Article | 26 August 2005 Paper

Characterization of SERS substrates for chem/bio processing systems

Joseph Miragliotta, Jennifer Sample, Stergios Papadakis

Proceedings Volume 5927, 59270P (2005) https://doi.org/10.1117/12.617871

KEYWORDS: Surface enhanced Raman spectroscopy, Silver, Microfluidics, Gold, Statistical analysis, Raman spectroscopy, Chemical analysis, Biological research, Sensors, Nanoparticles

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Proceedings Article | 18 August 2005 Paper

Scanning surface-enhanced Raman spectroscopy of silver nanowires

Stergios Papadakis, Joseph Miragliotta, Zhiyong Gu, David Gracias

Proceedings Volume 5927, 59271H (2005) https://doi.org/10.1117/12.617885

KEYWORDS: Raman spectroscopy, Sensors, Spectroscopy, Silver, Molecules, Scanning electron microscopy, Polarization, Electrodes, Surface enhanced Raman spectroscopy, Nanowires

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Showing 5 of 12 publications

Conference Committee Involvement (4)

Micro- and Nanotechnology Sensors, Systems, and Applications VII

20 April 2015 | Baltimore, MD, United States

Micro- and Nanotechnology Sensors, Systems, and Applications VI

5 May 2014 | Baltimore, MD, United States

Micro- and Nanotechnology Sensors, Systems, and Applications V

29 April 2013 | Baltimore, Maryland, United States

Micro- and Nanotechnology Sensors, Systems, and Applications IV

23 April 2012 | Baltimore, Maryland, United States

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