N. R. Erickson

North Carolina State University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

P. F. Goldsmith

Jet Propulsion Laboratory

R. L. Snell

University of Massachusetts Amherst

David A. Neufeld

Johns Hopkins University

Gary J. Melnick

Center for Astrophysics Harvard & Smithsonian

R. Schieder

University of Cologne

Martin Harwit

Cornell University

R. Plume

University of Calgary

J. R. Stauffer

Mayo Clinic in Florida

Volker Tolls

Center for Astrophysics Harvard & Smithsonian

B. M. Patten

Center for Astrophysics Harvard & Smithsonian

Cooperative Institutions

Max Planck Institute for Radio Astronomy

130

Center for Astrophysics Harvard & Smithsonian

119

Max Planck Society

111

Jet Propulsion Laboratory

107

Massachusetts Institute of Technology

106

California Institute of Technology

103

Centre National de la Recherche Scientifique

North Carolina State University

SRON Netherlands Institute for Space Research

University of Arizona

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

TeraHertz Schottky-Diode Balanced Mixers

N. R. Erickson Thomas M. Goyette

We report on the first THz balanced mixer/upconverter using a Schottky diode MMIC chip. Using an optically pumped laser at 1562 GHz as an LO source with a coupled power of about 1 mW, and 1 mW input at an IF frequency of 10 GHz, we obtained a sideband output power of 23 uW (sum of two sidebands). As a mixer, at an LO of 1621 GHz, we obtain a conversion loss of 12.4 dB DSB and a noise temperature of 5600 K DSB. Response is believed to be similar over a band 1250-1650 GHz. New diodes have been designed for easier application as mixers up through 3 THz, and a new wafer run is in process.

Electronic mixer

Frequency mixer

Source

Cite

Citations (2)

A Novel Full Waveguide Band Orthomode Transducer

Softwaretechnik-Trends (2002)

Gopal Narayanan N. R. Erickson

Diplexer

Return loss

Dual-polarization interferometry

Waveguide

Source

Cite

Citations (21)

Cryogenic operation of submillimeter quasioptical mixers

International Journal of Infrared and Millimeter Waves (1981)

P. F. Goldsmith H. R. Fetterman B. J. Clifton C. D. Parker N. R. Erickson

Reflector (photography)

Noise temperature

Cryogenics

10.1007/bf01006938

Cite

Citations (7)

Early Science with the Large Millimeter Telescope: COOL BUDHIES I – a pilot study of molecular and atomic gas atz≃ 0.2

Monthly Notices of the Royal Astronomical Society (2016)

Ryan Cybulski Min S. Yun N. R. Erickson V. De la Luz Gopal Narayanan

An understanding of the mass build-up in galaxies over time necessitates tracing the evolution of cold gas (molecular and atomic) in galaxies. To that end, we have conducted a pilot study called CO Observations with the LMT of the Blind Ultra-Deep H I Environment Survey (COOL BUDHIES). We have observed 23 galaxies in and around the two clusters Abell 2192 (z = 0.188) and Abell 963 (z = 0.206), where 12 are cluster members and 11 are slightly in the foreground or background, using about 28 total hours on the Redshift Search Receiver (RSR) on the Large Millimeter Telescope (LMT) to measure the $^{12}$CO J = 1 --> 0 emission line and obtain molecular gas masses. These new observations provide a unique opportunity to probe both the molecular and atomic components of galaxies as a function of environment beyond the local Universe. For our sample of 23 galaxies, nine have reliable detections (S/N$\geq$3.6) of the $^{12}$CO line, and another six have marginal detections (2.0 < S/N < 3.6). For the remaining eight targets we can place upper limits on molecular gas masses roughly between $10^9$ and $10^{10} M_\odot$. Comparing our results to other studies of molecular gas, we find that our sample is significantly more abundant in molecular gas overall, when compared to the stellar and the atomic gas component, and our median molecular gas fraction lies about $1\sigma$ above the upper limits of proposed redshift evolution in earlier studies. We discuss possible reasons for this discrepancy, with the most likely conclusion being target selection and Eddington bias.

Atomic carbon

Line (geometry)

10.1093/mnras/stw798

Cite

Citations (34)

<title>Performance Of The Multiple Mirror Telescope (MMT) X. The First Submillimeter Phased Array</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1982)

B. L. Ulich C. J. Lada N. R. Erickson P. F. Goldsmith G. R. Huguenin

The Multiple Mirror Telescope (MMT) has been used for the first time to make astronomical observations as a coherent phased array at sub-millimeter wavelengths. The success of the initial experiment indicates that the precipitable water vapor over Mt. Hopkins is sufficiently low to permit routine operation at 870 μm wavelength and frequent operation at 450 μm and 350 μm wavelength. The six telescopes of the MMT were initially phased to an accuracy of λ/30 at λ = 870 μm and remained phased to that accuracy over a four day period and over a wide range of elevation angle. The measured beam pattern of the telescope matches diffraction theory, and the width of the main lobe is 26 arc seconds. A coherent super-heterodyne receiver and a novel beamcombiner were used to make spectral line maps of the J = 3-2 line of CO. The combination of large collecting area, high angular resolution, and good atmospheric transmission makes the MMT superior to other existing telescopes for both continuum and spectral line astronomy at sub-millimeter wavelengths.

Submillimeter wave

10.1117/12.933506

Cite

Citations (2)

Search for Interstellar Molecular Oxygen

Bulletin of the American Astronomical Society (1984)

P. F. Goldsmith R. L. Snell N. R. Erickson R. L. Dickman F. P. Schloerb

Molecular oxygen

Source

Cite

Citations (0)

EVIDENCE FOR 1000 km s ^–1 MOLECULAR OUTFLOWS IN THE LOCAL ULIRG POPULATION

The Astrophysical Journal Letters (2011)

Aeree Chung Min S. Yun Gopal Naraynan M. H. Heyer N. R. Erickson

The feedback from galactic outflows is thought to play an important role in shaping the gas content, star formation history, and ultimately the stellar mass function of galaxies. Here we present evidence for massive molecular outflows associated with ultra-luminous infrared galaxies (ULIRGs) in the coadded Redshift Search Receiver 12CO(1-0) spectrum. Our stacked spectrum of 27 ULIRGs at z = 0.043-0.11 (freq_rest = 110-120 GHz) shows broad wings around the CO line with delta_V(FWZI)~2000 km/s. Its integrated line flux accounts for up to 25+/-5% of the total CO line luminosity. When interpreted as a massive molecular outflow wind, the associated mechanical energy can be explained by a concentrated starburst with SFR \geq 100 M_sun/yr, which agrees well with their SFR derived from the FIR luminosity. Using the high signal-to-noise stacked composite spectrum, we also probe 13CO and 12CN emission in the sample and discuss how the chemical abundance of molecular gas may vary depending on the physical conditions of the nuclear region.

Line (geometry)

10.1088/2041-8205/732/1/l15

Cite

Citations (41)

IEEE Transactions on Terahertz Science and Technology

IEEE Transactions on Terahertz Science and Technology (2022)

Imran Mehdi Sharri Shaw Frank Maiwald Scott Barker Hamidreza Afzal

Terahertz gap

10.1109/tthz.2022.3152956

Cite

Citations (0)

LOW COST DIRECT MACHINING OF TERAHERTZ WAVEGUIDE STRUCTURES

Gopal Narayanan N. R. Erickson R. M. Grosslein

We present a low cost technique of direct machining of precision waveguide structures on metal blocks. The micro machine setup employs compact, precision numerically controlled (NC) stages to automate the machining process. Endmills are held in high speed pneumatic spindles, while other features are made by scraping (broaching ) in repeated small passes. We can set up two endmills and three broaches at the same time. The fabrication process is monitored under a microscope, while the ambient temperature conditions are controlled. The NC code is generated from a combination of AutoCAD drawings, commercially available CAD/CAM software and simulation software we developed for this process. Both halves of a reasonably complex tripler block can be fabricated in under 3 hours, including setup time. An estimate of the machining accuracy is about 7 pm, the accuracy being principally limited by the difficulties in visually inspecting the microscopic machined features and correcting the small tool offsets. We also discuss methods to extend this technique to the fabrication of THz waveguides.

Broaching

Electrical Discharge Machining

Waveguide

Source

Cite

Citations (17)

An all solid-state 640 GHz subharmonic mixer

Imran Mehdi Peter H. Siegel D.A. Humphrey T.H. Lee Robert J. Dengler

This paper reports on the first all solid-state two-diode subharmonically pumped (SHP) mixer operating at 640 GHz. The required local oscillator (LO) power is less than 4 mW at 320 GHz for optimum performance. Two approaches are used to generate the required LO power. The first approach utilizes a 107 GHz InP Gunn diode followed by a whisker-contacted tripler while the second employs an IMPATT diode at 80 GHz followed by two planar diode frequency doublers. The best measured mixer noise temperature is 2500 K double sideband with a conversion loss of 9 dB at an IF of 2 GHz. An IF-frequency scan of the mixer shows a noise temperature of no worse than 3700 K across the 1.5 to 15 GHz band. Extraneous LO noise from the IMPATT is not evident for the SHP mixer, even at those frequencies and with low IF's. This performance represents the state-of-the-art for room temperature subharmonic mixers operating at these frequencies. The mixers are being developed for NASA's Mission to Planet Earth.

Electronic mixer

IMPATT diode

Frequency mixer

Subharmonic

Noise temperature

Compatible sideband transmission

10.1109/mwsym.1998.705019

Cite

Citations (31)