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Hire Dr. Julian A.

United Kingdom

Profile Summary

My experience as a researcher focus mainly in thermal transport. I did my PhD in semiconductor nanowires and nowadays I am working in diamond as an efficient solution for improving the thermal transport in high-power electronic devices. In both fields I have been developing both fundamental models, e.g. for nanoscale phonon transport and designing and performing cutting edge experimental work. An excellent example is my recent publication in Acta Materialia where I developed thermal models for ultra-thin diamond which were then verified experimentally. Now I am using diamond for heat sinking of electronic GaN devices which is of significant current interest, but there is a clear lack of understanding of its properties and how they are impacted by its nanostructure. Here I am leading this field internationally and my work has attracted major attention including that of a US DARPA funding agency. I also have a strong sense on how to merge science with engineering, achieved by collaborations with worl-leading companies like Element-Six, the world’s major synthetic diamond supplier and Thales-Alenia in collaboration with the European Space Agency. Summary: Fundamental physics: Thermal transport in ultra thin diamond layers. Thermal transport in GaN. Thermionic emission from fuctionalised diamond surfaces. Thermal transport at nanoscale. Optoelectronic properties at semiconductor heterojunctions. Applied projects: DARPA-Round Robin, metrology of high thermal conductivity materials. ESA7034 , reliability studies and thermal analysis of RF thermal packages made of diamond/metal composites. Industrial projects: Diamond/metal thermal attachment optimization for Element Six (patent pending,GB1520594.1). Optimization of Element Six heat spreading solutions. Phonon-thermal transport simulation software made for Element six. Educational projects: Supervision of multiple PhD students. Teaching and tutoring of students at University of Bristol Computational Skills: Finite element modelling, including ANSYS and COMSOL. Mathematical programming, including Wolfram Mathematica, Matlab and SciPy

Subject Matter Expertise

• ☆ Thermal Analysis
• ☆ Nanotechnology
• ☆ Solid State Sciences
• ☆ Physics
• ☆ Mathematical Models
• ☆ Mathematical Physics

Services

• Consulting
• Data & AI
• Product Development

Work Experience

Research assistant

University of Bristol

June 2013 - Present

Education

PhD (Solid state physics)

Universidad de Valladolid

October 2011 - November 2013

Master in mathematical modelling and computation (Maths)

Universidad de Valladolid

October 2009 - June 2011

Physics (Ciencias)

Universidad de Valladolid

October 2001 - July 2009

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Anaya, Julian and Rossi, Stefano and Alomari, Mohammed and Kohn, Erhard and T{\'o}th, Lajos and P{\'e}cz, B{\'e}la and Hobart, Karl D and Anderson, Travis J and Feygelson, Tatyana I and Pate, Bradford B and others(2016). Control of the in-plane thermal conductivity of ultra-thin nanocrystalline diamond films through the grain and grain boundary properties. Acta Materialia. 103. p. 141--152. Pergamon

Anaya, J and Torres, A and Jimenez, J and Prieto, C and Rodr{\'\i}guez, A and Rodr{\'\i}guez, T and Ballesteros, C(2015). Enhanced Signal Micro-Raman Study of SiGe Nanowires and SiGe/Si Nanowire Axial Heterojunctions Grown Using Au and Ga-Au Catalysts. MRS Proceedings. 1751. p. mrsf14--1751. Cambridge University Press

Anaya, J and Rodr{\'\i}guez, T and Jim{\'e}nez, J(2015). Predictive Model for the Thermal Conductivity of Rough and Smooth Silicon Nanowires. Science of Advanced Materials. 7. (6). p. 1097--1107. American Scientific Publishers

Anaya, Julian and Rossi, Stefano and Alomari, Mohammed and Kohn, Erhard and T{\'o}th, Lajos and P{\'e}cz, B{\'e}la and Kuball, Martin(2015). Thermal conductivity of ultrathin nano-crystalline diamond films determined by Raman thermography assisted by silicon nanowires. Applied Physics Letters. 106. (22). p. 223101. AIP Publishing

Souto, J and Rodr{\'\i}guez, M and Anaya, J and Torres, A and Jim{\'e}nez, J(2014). ABOUT THE CRITICAL TEMPERATURE FOR CATASTROPHIC OPTICAL DAMAGE IN HIGH POWER LASER DIODES. International Symposium on Reliability of Optoelectronics for Systems. 16. p. 20.

Anaya, J and Jimenez, Juan and Rodriguez, A and Rodr{\'\i}guez, T(2014). Electromagnetic interaction between a laser beam and semiconductor nanowires deposited on different substrates: Raman enhancement in Si Nanowires. MRS Proceedings. 1627. p. mrsf13--1627. Cambridge University Press

Anaya, J and Torres, A and Jim{\'e}nez, Juan and Rodr{\'\i}guez, A and Rodr{\'\i}guez, T and Ballesteros, C(2014). Raman Spectroscopy in Group IV Nanowires and Nanowire Axial Heterostructures. MRS Proceedings. 1659. p. 143--148. Cambridge University Press

Anaya, J and Torres, A and Hortelano, V and Jim{\'e}nez, J and Prieto, AC and Rodr{\'\i}guez, A and Rodr{\'\i}guez, T and Rogel, R{\'e}gis and Pichon, Laurent(2014). Raman spectrum of Si nanowires: temperature and phonon confinement effects. Applied Physics A. 114. (4). p. 1321--1331. Springer

Jimenez, Juan and Anaya, Julian and Souto, Jorge(2014). Role of Thermal Stresses in Degradation of High Power Laser Diodes. Transactions of Nanjing University of Aeronautics and Astronautics. 2. p. 016.

Simon, Roland B and Anaya, Julian and Kuball, Martin(2014). Thermal conductivity of bulk GaN—Effects of oxygen, magnesium doping, and strain field compensation. Applied Physics Letters. 105. (20). p. 202105. AIP Publishing

Hodges, Chris and Calvo, J Anaya and Stoffels, Steve and Marcon, Denis and Kuball, M(2013). AlGaN/GaN field effect transistors for power electronics—Effect of finite GaN layer thickness on thermal characteristics. Applied Physics Letters. 103. (20). p. 202108. AIP Publishing

Hortelano, V and Anaya, J and Souto, J and Jim{\'e}nez, J and Perinet, J and Laruelle, F(2013). Defect signatures in degraded high power laser diodes. Microelectronics Reliability. 53. (9). p. 1501--1505. Elsevier

Anaya, J and Torres, A and Prieto, AC and Jimenez, J and Rodr{\'\i}guez, A and Rodr{\'\i}guez, T(2013). Interaction between a laser beam and semiconductor nanowires: application to the Raman spectrum of Si nanowires. International Journal of Nanoparticles 11. 6. (2-3). p. 103--112. Inderscience Publishers Ltd

Anaya, J and Torres, A and Mart{\'\i}n-Mart{\'\i}n, A and Souto, J and Jim{\'e}nez, Juan and Rodr{\'\i}guez, A and Rodr{\'\i}guez, T(2013). Study of the temperature distribution in Si nanowires under microscopic laser beam excitation. Applied Physics A. 113. (1). p. 167--176. Springer

Anaya Calvo, Juli{\'a}n and others(2013). Transporte térmico y caracterización Raman de Nanohilos Semiconductores de Silicio-Germanio.

Anaya, J and Martin-Martin, A and Souto, J and I{\~n}iguez, P and Jimenez, J(2012). Thermomechanical modelling of high power laser diode degradation. MRS Proceedings. 1432. p. mrss12--1432. Cambridge University Press

Anaya, J and Torres, A and Martin-Mart{\'\i}n, A and Jim{\'e}nez, Juan and Rodr{\'\i}guez, A and Rodr{\'\i}guez, T(2012). Laser Induced Heating of Group IV Nanowires. MRS Proceedings. 1404. p. mrsf11--1404. Cambridge University Press

Anaya, J and Prieto, AC and Martinez, O and Torres, A and Mart{\'\i}n-Mart{\'\i}n, A and Jimenez, J and Rodr{\'\i}guez, A and Sangrador, J and Rodr{\'\i}guez, T(2011). Si and SixGe1-x NWs studied by Raman spectroscopy. physica status solidi (c). 8. (4). p. 1307--1310. Wiley Online Library

Anaya, J and Prieto, C and Souto, J and Jim{\'e}nez, Juan and Rodr{\'\i}guez, A and Sangrador, J and Rodr{\'\i}guez, T(2011). Raman spectrum of group IV nanowires: influence of temperature. MRS Proceedings. 1305. p. mrsf10--1305. Cambridge University Press

Anaya, J and Torres, A and Mart{\'\i}n-Mart{\'\i}n, A and Mart{\'\i}nez, O and Prieto, AC and Jim{\'e}nez, J and Rodr{\'\i}guez, A and Sangrador, J and Rodr{\'\i}guez, T(2010). Raman spectroscopy study of group IV semiconductor nanowires. Physics Procedia. 8. p. 78--83. Elsevier

Mart{\'\i}nez, O and Anaya, J and Torres, A and Mart{\'\i}n-Mart{\'\i}n, A and Prieto, AC and Hortelano, V and Jim{\'e}nez, J and Rodr{\'\i}guez, A and Sangrador, J and Rodr{\'\i}guez, TESTUDIO MEDIANTE ESPECTROSCOPIA RAMAN DE NANOHILOS SEMICONDUCTORES DEL GRUPO IV.

CONFERENCE PAPER

Souto, J and Pura, Jose Luis and Rodr{\'\i}guez, M and Anaya, J and Torres, A and Jimenez, Juan(2015). Mechanisms driving the catastrophic optical damage in high power laser diodes. SPIE LASE. p. 93480O--93480O.

Kuball, Martin and Pomeroy, James W and Calvo, Julian Anaya and Sun, Huarui and Simon, Roland B and Francis, Daniel and Faili, Firooz and Twitchen, Daniel and Rossi, Stefano and Alomari, Mohammed and others(2015). Novel Thermal Management of GaN Electronics: Diamond Substrates. ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. p. V003T08A001--V003T08A001.

Kuball, Martin and Calvo, Julian Anaya and Simon, Roland B and Pomeroy, James W(2014). Novel thermal management and its analysis in GaN electronics. Microwave Conference (APMC), 2014 Asia-Pacific. p. 920--922.

Jimenez, Joaquin and Anaya, Jose Javier and Hortelano, Vanesa and Souto, J and Martin-Martin, A(2013). Degradation signatures of high power laser diodes. Electron Devices (CDE), 2013 Spanish Conference on. p. 309--312.

Anaya, Juli{\'a}n and Prieto, Carmelo and Torres, Alfredo and Mart{\'\i}n-Mart{\'\i}n, Alonso and Souto, Jorge and Jim{\'e}nez, Juan and Rodr{\'\i}guez, Andres and Rodr{\'\i}guez, Tom{\'a}s(2012). MicroRaman Spectroscopy of Si Nanowires: Influence of Size. Materials Science Forum. 725. p. 255--258.

REPORT

Jimenez, Juan and Hortelano, V and Martinez, O and Anaya, J(2013). Microscopic Optical Characterization of Free Standing III-Nitride Substrates, ZnO Bulk Crystals, and III-V Structures for Non-Linear Optics.

BOOK CHAPTER

Anaya, Julian and Jimenez, Juan and Rodriguez, Tomas(2013). Modelling the thermal conductivity of semiconductor NWs; a step forward to the increase of the thermoelectric figure of merit. 2013 Spanish Conference on Electron Devices.

DISSERTATION THESIS

Calvo, Juli{\'a}n Anaya(2013). Transporte térmico y caracterización Raman de nanohilos semiconductores de Silicio y Silicio-Germanio.

BOOK

Anaya, J and Jim{\'e}nez, J and Rodr{\'\i}guez, T(2012). Thermal Transport in Semiconductor Nanowires. INTECH Open Access Publisher