Peer-Reviewed Journals

  1. A.P. Ravikumar, and A.R. Brandt (2017). Distributional impacts of methane emissions on the greenhouse gas footprint of the electricity sector. In preparation.
  2. A.P. Ravikumar, and A.R. Brandt (2017). The value of methane leak quanti cation in natural gas systems. In preparation.
  3. A.P. Ravikumar, J. Wang, M. McGuire, C. Bell, D. Zimmerle, and A.R. Brandt (2017). “Good versus Good Enough? Empirical tests of methane leak detection sensitivity of a commercial infrared camera.” In review: Environ. Sci. Technol.
  4. A.P. Ravikumar, and A.R. Brandt (2017). “Designing better methane mitigation policies: the challenge of distributed small sources in the natural gas sector“. Environ. Res. Lett. 12 044023.
  5. A.P. Ravikumar, J. Wang, and A.R. Brandt (2017). “Are optical gas imaging technologies effective for methane leak detection?“, Environ. Sci. & Technol. 51, 718.
  6. C.E. Kemp, A.P. Ravikumar, and A.R. Brandt (2016). “Comparing natural gas leakage detection technologies using an open-source ‘virtual gas field’ simulator”, Environ. Sci. & Technol. 50, 4546. PDF
  7. Y. Kaya, A.P. Ravikumar, G. Chen, M.C. Tamargo, A. Shen, and C.F. Gmachl (2017). Absolute Temperature Sensing by a Two-band ZnCdSe/ZnCdMgSe Quantum Well Infrared Photodetector. In review: Appl. Phys. Lett.
  8. A.P. Ravikumar, D. Sivco, and C.F. Gmachl (2016). “Wavelength independent normal-incidence detection for intersubband infrared detectors”, Optics Exp. 24, 25269.
  9. G. Chen, Y. Kaya, A.P. Ravikumar, M.C. Tamargo, C.F. Gmachl, and A. Shen (2016) “Growth and characterization of ZnCdSe/ZnCdMgSe two-color quantum well infrared photodetectors”, Phys. Status Solidi C 13, 673.
  10. T.A. Garcia, A.P. Ravikumar, M.C. Tamargo, and C.F. Gmachl (2016). “II-VI quantum cascade emitters in the 6-8 µm range”,  Phys. Status Solidi B. 253, 1494.
  11. A.P. Ravikumar, J. De Jesus, M.C. Tamargo, and C. Gmachl (2015). “II-VI based mid-infrared broadband Quantum Cascade detector”, Appl. Phys. Lett. 107, 141105.
  12. O. Wolf, S. Campione, A. Benz, A. P. Ravikumar, S. Liu, E. A. Kadlec, E. A. Shaner, J. F. Klem, M. B. Sinclair, and I. Brener (2015). “Phased-array sources based on non-linear metamaterial nanocavities”, Nature Comm., 6, 7667.
  13. A.P. Ravikumar, T.A. Garcia, J. De Jesus, M. C. Tamargo, and C. Gmachl (2014). “High detectivity short wavelength II-VI Quantum Cascade Detector”, Appl. Phys. Lett. 105, 051113.
  14. A.P. Ravikumar, G. Chen, K. Zhao, Y. Tian, P. Prucnal, M.C. Tamargo, C.F. Gmachl, and A. Shen (2013). “Room temperature and high responsivity II-VI short wavelength quantum well infrared photodetector”, Appl. Phys. Lett. 102, 161107.
  15. A. Shen, A.P. Ravikumar, G. Chen, K. Zhao, A. Alfaro-Martinez, T. Garcia, J. De Jesus, M. C. Tamargo and C. Gmachl (2013). “MBE growth of ZnCdSe/ZnCdMgSe quantum-well infrared photodetectors”, J. Vac. Sci. Technol. B 31, 03C113.
  16. De Jesus, T.A. Garcia, S. Dhomkar, A.P. Ravikumar, C. Gmachl, A. Shen, D. Ferizovic, M. Munoz, and M.C. Tamargo (2013). “Characterization of three-well active region of a quantum cascade laser using contactless electroreflectance”, J. Vac. Sci. Technol. B 31, 03C134.
  17. T.A. Garcia, S. Hong, Y. Gao, M. Tamargo, J. De Jesus, V. Deligiannakis, A.P. Ravikumar, C. Gmachl, and A. Shen (2013). “Improved electrical properties and crystalline quality of II-VI heterostructures for quantum cascade lasers”, J. Vac. Sci. Technol. B 31, 03C133.
  18. A.P. Ravikumar, A. Alfaro-Martinez, G. Chen, K. Zhao, M.C. Tamargo, C.F. Gmachl and A. Shen (2012). “ZnCdSe/ZnCdMgSe quantum well infrared photodetector”, Optics Express 20, 22391 – 22397.
  19. S. Dhara, H.S. Solanki, A.P. Ravikumar, V. Singh, S. Sengupta, B.A. Chalke, A. Dhar, M. Gokhale, A. Bhattacharya, and M.M. Deshmukh (2011). “Tunable thermal conductivity in defect engineered nanowires at low temperatures”, Phys. Rev. B 84, 121307.
  20. S. Dhara, S. Sengupta, H.S. Solanki, A. Maurya, A.P. Ravikumar,, M.R. Gokhale, A. Bhattacharya, and M.M. Deshmukh (2011). “Facile fabrication of lateral nanowire wrap-gate devices with improved performance”, Appl. Phys. Lett. 99, 173101.

Patents
  1. Arvind P. Ravikumar, Maria C. Tamargo, Aidong Shen, and Claire Gmachl, “II-VI materials based short and long wave Quantum Well Infrared Photodetectors”, US 14/185,404, February 2014.

Peer-Reviewed Technical Reports

A.P. Ravikumar, C. Chou, J. Jhaveri, J. Baldwin, P. Hanna, K. Keller, W. Peng, S. Rabin, A. Trierweiler, T. Wang, and R. Socolow (2016). “Nuclear energy from magnetic confinement fusion”, Energy Technology Distillate Series, Andlinger Center for Energy and the Environment, .


Invited Presentations
  1. A.P. Ravikumar, “Are optical gas imaging technologies effective for methane leak detection?” California Air Resources Board, Sacramento, CA, February 2017.
  2. A.P. Ravikumar, G. Chen, J. de-Jesus, T. Garcia, M.C. Tamargo, A. Shen, and C. Gmachl, “High performance II-VI ZnCdSe/ZnCdMgSe based intersubband infrared detectors”, US Workshop on the Physics and Chemistry of II-VI materials, Chicago, IL, October 2013.

Conference Presentations
  1. A. P. Ravikumar, J. Wang, M. McGuire, C. Bell, and A.R. Brandt (2017). Of detection limits and effective mitigation: the use of infrared cameras for methane leak detection. American Geophysical Union Fall Meeting, New Orleans, LA, December 2017.
  2. J. Wang, A.P. Ravikumar, M. McGuire, C. Bell, L.P. Tchapmi, and A.R. Brandt (2017). Two-stream convolutional neural network for methane emissions quanti fication. American Geophysical Union Fall Meeting, New Orleans, LA, December 2017.
  3. D. J. Roda-Stuart, A.P. Ravikumar, and A.R. Brandt (2017). Impact of methane leak detection and repair programs: determining pre- and post-survey emission factors. American Geophysical Union Fall Meeting, New Orleans, LA, December 2017.
  4. B. Nicholson, K.A. Klise, C.D. Laird, A.P. Ravikumar, and A.R. Brandt (2017). Optimization of emissions sensor networks incorporating tradeoffs between different sensor technologies. American Geophysical Union Fall Meeting, New Orleans, LA, December 2017.
  5. A.P. Ravikumar, and A.R. Brandt (2017). The role of prescriptive policies in mitigating methane emissions from the oil and gas sector. 35th USAEE/IAEE North American Conference, Houston, TX, November 2017.
  6. A.P. Ravikumar, and A.R. Brandt (2017). Distributional impacts of methane emissions on the GHG footprint of the electricity sector. Energy Policy Research Conference, Park City, UT, September 2017.
  7. A.P. Ravikumar, J. Wang, and A.R. Brandt (2016). Is optical gas imaging effective for detecting fugitive methane emissions? – A technological and policy perspective. American Geophysical Union Fall Meeting, San Francisco CA, December 2016.
  8. J. Jagdeo, A.P. Ravikumar, E. Grubert, and A. R. Brandt (2016). A Holistic Assessment of Energy Production: Environmental, Economic, and Social Impacts of Hydraulic Fracturing in Williams County, North Dakota. Submitted: American Geophysical Union Fall Meeting, San Francisco CA, December 2016.
  9. Y. Kaya, A.P. Ravikumar, G. Chen, A. Shen, M.C. Tamargo, and C. Gmachl (2016). Absolute temperature sensing by a two-color ZnCdSe/ZnCdMgSe detector. U.S. Workshop on the Physics and Chemistry of II-VI materials, Baltimore MD, October 2016.
  10. Y. Kaya, A.P. Ravikumar, G. Chen, M.C. Tamargo, A. Shen, and C. Gmachl (2016). Multi-leads, two-color ZnCdSe/ZnCdMgSe based quantum well infrared photodetectors. Conference on Lasers and Electro-Optics (CLEO), San Jose CA, June 2016.
  11. Y. Kaya, A.P. Ravikumar, G. Chen, M.C. Tamargo, A. Shen, and C.F. Gmachl, “Multi terminal two-color ZnCdSe/ZnCdMgSe based quantum-well infrared photodetector”, American Physical Society Spring Meeting, Baltimore, MD, March 2016.
  12. De Jesus, T.A. Garcia, A.P. Ravikumar, C.F. Gmachl, and M. C. Tamargo, “II-VI semiconductor based broadband Quantum Cascade Detectors” , North American Conference on Molecular Beam Epitaxy (NAMBE), Riviera Maya, Mexico, October 2015.
  13. J. De Jesus, T.A. Garcia, A.P. Ravikumar, C.F. Gmachl, and M.C. Tamargo, “II-VI broadband quantum cascade detectors”, 17th International Conference on II-VI compounds and Related Materials (II-VI 2015), Paris, France, September 2015.
  14. G. Chen, A.P. Ravikumar, T. Garcia, J. De Jesus, M. C. Tamargo, C. Gmachl, and A. Shen, “Growth and characterization of ZnCdSe/ZnCdMgSe two-color quantum well infrared photodetectors”, 17th International Conference on II-VI compounds and Related Materials (II-VI 2015), Paris, France, September 2015.
  15. A.P. Ravikumar, T.A. Garcia, J. De Jesus, M.C. Tamargo, and C. Gmachl, “Long wave, room temperature II-VI based Quantum Cascade emitters”, Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, June 2015.
  16. O. Wolf, S. Campione, A. Benz, A.P. Ravikumar, S. Liu, E.A. Kadlec, E. Shaner, J.F. Klem, M.B. Sinclair, and I. Brener, “Coherent second harmonic generation in a quantum well – metasurface coupled system”, Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, June 2015.
  17. O. Wolf, S. Campione, A. Benz, A.P. Ravikumar, S. Liu, E.A. Kadlec, E.A. Shaner, J.F. Klem, M.B. Sinclair, and I. Brener, “Fully customizable light sources based on second harmonic generation in a quantum well-metasurface coupled system”, Materials Research Society Spring Meeting, San Francisco, CA, April 2015.
  18. A.P. Ravikumar, T.A. Garcia, J. De Jesus, M. Tamargo and C. Gmachl, “II-VI based broadband infrared photodetector”, US Workshop on the Physics and Chemistry of II-VI materials, Baltimore, MD, October 2014.
  19. M. C. Tamargo, T. A. Garcia, J. De Jesus, G. Chen, V. Deligianakis, A. P. Ravikumar, C. Gmachl, and A. Shen, “Progress in wide bandgap II-VI materials for intersuband devices: Quantum Cascade Detectors”, 18th International Conference on Molecular Beam Epitaxy, Flagstaff, AZ, September 2014.
  20. A.P. Ravikumar, G. Chen, T.A. Garcia, J. De Jesus, A. Shen, M. Tamargo, and C. Gmachl, “II-VI materials based intersubband infrared detectors”, Quantum Structured Infrared Photodetector International Conference (QSIP 2014), Sante Fe, NM, July 2014.
  21. A.P. Ravikumar, T.A. Garcia, J. De Jesus, M.C. Tamargo, and C. Gmachl, “High detectivity short wavelength II-VI Quantum Cascade Detector”, Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, June 2014.
  22. A.P. Ravikumar, G. Chen, J. De-Jesus, T. Garcia, M.C. Tamargo, A. Shen, and C. Gmachl, “High performance II-VI ZnCdSe/ZnCdMgSe based Quantum Cascade detectors”, 12th International Conference on Intersubband Transitions in Quantum Wells (ITQW 2013), Bolton Landing, NY, September 2013.
  23. J. De Jesus, T.A. Garcia, S. Dhomkar, A.P. Ravikumar, C.F. Gmachl, A. Shen, and M. C. Tamargo, “Use of contactless electroreflectance and modeling techniques to characterize intersubband devices”, 12th International Conference on Intersubband Transitions in Quantum Wells (ITQW 2013), Bolton Landing, NY, September 2013.
  24. T.A. Garcia, J. De Jesus, A.P. Ravikumar, S. Hong, V. Deligiannakis, C.F. Gmachl, A. Shen, and M.C. Tamargo, “Growth interruptions in MBE grown II-VI heterostructures for quantum cascade devices”, 12th International Conference on Intersubband Transitions in Quantum Wells (ITQW 2013), Bolton Landing, NY, September 2013.
  25. 18. P. Ravikumar, J. De-Jesus, T. Garcia, A. Shen, M.C. Tamargo, and C. Gmachl, “ZnCdSe/ZnCdMgSe based mid-infrared quantum cascade emitters”, 16th International Conference on II-VI compounds and Related Materials (II-VI 2013), Nagahama, Japan, September 2013.
  26. 17. P. Ravikumar, A. Shen, G. Chen, K. Zhao, Y. Tian, P. Prucnal, M. Tamargo, and C. Gmachl, “High performance quantum-well infrared photodetetectors made from wide band-gap II-VI semiconductors”, 16th International Conference on II-VI compounds and Related Materials (II-VI 2013), Nagahama, Japan, September 2013.
  27. A.P. Ravikumar, G. Chen, K. Zhao, Y. Tian, P. Prucnal, M. Tamargo, C.F. Gmachl, and A. Shen, “Room temperature and high responsivity short wavelength II-VI quantum well infrared photodetector”, Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, June 2013.
  28. A.P. Ravikumar, G. Chen, K. Zhao, Y. Tian, P. Prucnal, M. Tamargo, C.F. Gmachl, and A. Shen, “High performance II-VI mid-wave quantum well infrared photodetector”, International Symposium on Photoelectronic Detection and Imaging (ISPDI), Beijing, China, June 2013.
  29. J. De Jesus, T.A. Garcia, S. Dhomkar, A.P. Ravikumar, C.F. Gmachl, M.C. Tamargo, and A. Shen, “Contactless electroreflectance characterization of a triple asymmetric coupled quantum well active region of a ZnCdMgSe-based quantum cascade laser”, American Physical Society March Meeting, Baltimore, Maryland, March 2013.
  30. T.A. Garcia, J. De Jesus, A.P. Ravikumar, M.C. Tamargo, C.F. Gmachl, and A.Shen, “Material improvements of ZnCdSe/ZnCdMgSe heterostructures for quantum cascade laser applications with incorporation of growth interruptions during MBE growth”, American Physical Society March Meeting, Baltimore, Maryland, March 2013.
  31. A. Shen, A.P. Ravikumar, A. Alfaro-Martinez, G. Chen, K. Zhao, T. Garcia, J. De Jesus, M.C. Tamargo, and C. Gmachl, “MBE growth of ZnCdSe / ZnCdMgSe quantum well infrared photodetectors”, North American Conference on Molecular Beam Epitaxy (NAMBE), Atlanta, GA, October 2012.
  32. T.A. Garcia, J. De Jesus, S. Dhomkar, R. Moug, A.P. Ravikumar, V. Deligiannakis, C. Gmachl, and M.Tamargo, “Improvements in electrical properties and crystalline quality of ZnCdSe/ZnCdMgSe heterostructures for quantum cascade laser applications”, North American Conference on Molecular Beam Epitaxy (NAMBE), Atlanta, GA, October 2012.
  33. J. De Jesus, T,A. Garcia, S, Dhomkar, A.P. Ravikumar, C. Gmachl, and M.C. Tamargo, “Characterization of quantum cascade laser active regions using contactless electroreflectance”, North American Conference on Molecular Beam Epitaxy (NAMBE), Atlanta, GA, October 2012.
  34. A.P. Ravikumar, Joel de Jesus, Thor Garcia, Peter Taylor, Samantha Essig, Heather Sandfort, Aidong Shen, Maria Tamargo, and Claire Gmachl, “II-VI short wavelength intersubband devices”, International Quantum Cascade Laser School and Workshop (IQCLSW), Vienna, Austria, September 2012.
  35. A.P. Ravikumar, Adrian Alfaro-Martinez, Guopeng Chen, Kuaile Zhao, Maria C. Tamargo, Claire Gmachl and Aidong Shen, “A II-VI quantum well infrared photodetector”, Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, May 2012.
  36. A.P. Ravikumar, A. Alfaro-Martinez, G. Chen, K. Zhao, M.C. Tamargo, C. Gmachl and A. Shen, “A II-VI quantum well infrared photodetector”, Consortium for Spectroscopic Sensor Systems (CoS3) Spring workshop, Princeton, NJ, April 2012.