Dr. Isaac Ruiz Profile

Dr. Isaac Ruiz

at Sandia National Labs

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 9 September 2019 Presentation

The deeply depleted graphene-insulator-semiconductor junction: a versatile approach towards light sensing across the electromagnetic spectrum (Conference Presentation)

Isaac Ruiz, Michael Goldflam, Thomas Beechem, Stephen Howell

Proceedings Volume 11088, 1108808 (2019) https://doi.org/10.1117/12.2527312

KEYWORDS: Semiconductors, Electromagnetism, Signal to noise ratio, Interfaces, Photodetectors, Photonic devices, Semiconductor materials, Absorption, Sensors, Mid-IR

Read Abstract +

The deeply depleted graphene-insulator-semiconductor (D2GOS) junction has been shown to be a promising device structure for photon detection, due to its high responsivity, signal to noise ratio and ability for direct readout of individual pixels. One of the unique advantages of this architecture is its ease of exchangeability to other semiconductor absorber material, with the major caveat of realizing a functional device is to be able to deplete the semiconductor in the graphene-insulator-semiconductor (GOS) stack. This allows the opportunity to design GOS junctions to selective absorption cutoffs by choosing bulk semiconductors with the appropriate bandgaps. In this work, recent progress in demonstrating the D2GOS detectors across the mid-Infrared to gamma ray spectrum is discussed, using a variety of semiconductor absorbers (InSb, InAs, InGaAs, Si, and CdZnTe), along with the challenges associated with working with each absorber type. It is shown that the semiconductor/insulator interface defect density and graphene mobility are the two critical determinants in improving the D2GOS junction’s integration lifetime, responsivity and signal to noise ratio. Reduction of defects the semiconductor/insulator interface are demonstrated by employing surface passivation of the semiconductor through the deposition of a thin high-quality oxide, specific to each semiconductor. This is shown to dramatically reduce the dark charge generation in the device, resulting in improvements in integration lifetime, responsivity and signal to noise ratio. Finally, the device performance between 77 K and 300 K are compared, demonstrating an increase in performance at lower temperatures, due to further reduction of dark charge generation. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.

Proceedings Article | 17 September 2018 Presentation

Voltage tuning of reflectance from a strongly coupled metasurface-semiconductor hybrid structure (Conference Presentation)

Raktim Sarma, Salvatore Campione, Michael Goldflam, Joshua Shank, Sean Smith, Jinhyun Noh, Peide Ye, Michael Sinclair, Ganapathi Subramania, Isaac Ruiz, Stephen Howell, Joel Wendt, Igal Brener

Proceedings Volume 10721, 107211E (2018) https://doi.org/10.1117/12.2321256

KEYWORDS: Reflectivity, Modulation, Beam steering, Dielectric polarization, Electronics, Semiconductors, Gold, Indium gallium arsenide, Doping, Scattering

Read Abstract +

Proceedings Article | 17 September 2018 Presentation

Reflectance modulation from a metasurface coupled to intersubband transitions in semiconductor quantum wells using quantum tunneling (Conference Presentation)

Raktim Sarma, Salvatore Campione, Michael Goldflam, Loan Le, M. Lange, Joshua Shank, Michael Wanke, Jinhyun Noh, Peide Ye, Isaac Ruiz, Stephen Howell, Michael Sinclair, Joel Wendt, Igal Brener

Proceedings Volume 10721, 1072123 (2018) https://doi.org/10.1117/12.2321900

KEYWORDS: Quantum wells, Modulation, Reflectivity, Semiconductors, Indium gallium arsenide, Heterojunctions, Optical design, Ultrafast phenomena, Optical modulators, Tunable filters

Read Abstract +

Proceedings Article | 10 September 2014 Paper

Pillared graphene and silicon nanocomposite architecture for anodes of lithium ion batteries

Wei Wang, Isaac Ruiz, Mihrimah Ozkan, Cengiz Ozkan

Proceedings Volume 9168, 91680M (2014) https://doi.org/10.1117/12.2063957

KEYWORDS: Graphene, Silicon, Nanostructures, Lithium, Copper, Ions, Scanning electron microscopy, Electrodes, Laser induced breakdown spectroscopy, Chemical vapor deposition

Read Abstract +

Proceedings Article | 24 September 2013 Paper

The effect of fluid mechanics on graphene growths by chemical vapor deposition

Jeffrey Bell, Isaac Ruiz, Cengiz Ozkan, Mihri Ozkan, Aaron George, Hamed Hosseinbay

Proceedings Volume 8814, 88140A (2013) https://doi.org/10.1117/12.2024909

KEYWORDS: Graphene, Chemical vapor deposition, Raman spectroscopy, Copper, Argon, Mechanics, Methane, Hydrogen, Crystals, Metals

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years