报告人 亚利桑那州立大学助理教授Liping Wang（王力平）博士
时间：2015年5月15日下午2点
地点：力学一楼504
报告内容：
Spectral control of thermal absorption and emission with engineered surface
radiative properties plays a crucial role in harvesting solar energy. In
this talk, I will discuss the exotic optical and radiative properties of
nano-engineered materials, or called metamaterials, and how the novel
metamaterials would greatly impact the performance of solar thermal, solar
thermophotovoltaic (TPV), and solar photovoltaic energy conversion. By
exciting magnetic polariton (MP), i.e., the coupling of electromagnetic
waves to magnetic resonance inside nanostructures, film-coupled
metamaterials made of tungsten gratings are successfully designed to achieve
spectrally-selective absorption. The underlying physical mechanism and
unique optical properties as a function of wavelength, direction, and
polarization will be discussed in detail. An optimized metamaterial
structure is numerically demonstrated as a perfect selective solar thermal
absorber with >88% solar absorptance and <3% mid-IR emittance. The solar-to-
heat conversion efficiency is theoretically predicted at different working
temperatures and optical concentrations, demonstrating the enhanced
performance with this superior metamaterial selective absorber. Recent
temperature-dependent optical characterization results of a fabricated
metamaterial solar absorber sample at room temperature up to 350°C will be
presented. Besides, such a metamaterial absorber could be readily used as a
selective TPV emitter at high temperatures. By using the designed
metamaterial as the selective solar absorber, which efficiently converts
solar energy to heat, and as the selective TPV emitter, which gives photons
with energy only above the bandgap of a photovoltaic cell, the performance
of a solar TPV system could be greatly enhanced. Finally, a film-coupled
metamaterial solar cell is proposed with an ultrathin active semiconductor
layer with thickness less than 100 nm. Plasmonic light trapping due to
excitation of MP, which strongly localizes light inside the active layer
above the semiconductor bandgap, is achieved, leading to enhanced optical
absorption in ultrathin solar cells and improved electric power generation.
简历：
Dr. Liping Wang completed his undergraduate study at University of Science
and Technology of China in 2004, followed by a Master degree at the Chinese
Academy of Science in 2007. Dr. Wang received his Ph.D. in mechanical
engineering with a focus on nanoscale radiative heat transfer in December
2011 at Georgia Institute of Technology under the guidance of Professor
Zhuomin Zhang. He started his academic career as an assistant professor at
Arizona State University in July 2012 after a short stay in Prof. Zhang’s
group as a postdoctoral fellow. Dr. Wang’s research aims to selectively
control thermal radiation for energy and sensing applications by
fundamentally understanding and exploring novel physical mechanisms in
nanoscale radiative transport with nanoengineered materials or so-called
metamaterials. Besides, he has been investigating near-field thermal
radiation for energy harvesting and thermal management applications, in
addition to the development of novel optical metrologies for thermal
characterizations. Dr. Wang is currently the director of the Nano-Engineered
Thermal Radiation Lab and the lead principal investigator for ASU’s
participation in the US-Australia Solar Energy Collaboration on Micro Urban
Solar Integrated Concentrator project, sponsored by Australian Renewable
Energy Agency. His research findings have been published in more than 30
peer-reviewed high-impact journal papers in applied physics, optics, and
heat transfer. He is the recipient of the most prestigious 2015 CAREER award
by the US National Science of Foundation for recognizing junior faculty who
exemplify the role of teacher-scholars through the integration of
outstanding research and excellent education, as well as 2011 ASME
NanoEngineering Council Best Poster Award and 2010 Hartnett-Irvine Best
Paper Award. Dr. Wang won 2013 Top 5% ASU Engineering Faculty Teaching Award
for his teaching excellence. Besides, he has been actively contributing to
the professional community by organizing technical conferences and reviewing
scientific manuscripts.
时间：2015年5月15日下午2点
地点：力学一楼504
报告内容：
Spectral control of thermal absorption and emission with engineered surface
radiative properties plays a crucial role in harvesting solar energy. In
this talk, I will discuss the exotic optical and radiative properties of
nano-engineered materials, or called metamaterials, and how the novel
metamaterials would greatly impact the performance of solar thermal, solar
thermophotovoltaic (TPV), and solar photovoltaic energy conversion. By
exciting magnetic polariton (MP), i.e., the coupling of electromagnetic
waves to magnetic resonance inside nanostructures, film-coupled
metamaterials made of tungsten gratings are successfully designed to achieve
spectrally-selective absorption. The underlying physical mechanism and
unique optical properties as a function of wavelength, direction, and
polarization will be discussed in detail. An optimized metamaterial
structure is numerically demonstrated as a perfect selective solar thermal
absorber with >88% solar absorptance and <3% mid-IR emittance. The solar-to-
heat conversion efficiency is theoretically predicted at different working
temperatures and optical concentrations, demonstrating the enhanced
performance with this superior metamaterial selective absorber. Recent
temperature-dependent optical characterization results of a fabricated
metamaterial solar absorber sample at room temperature up to 350°C will be
presented. Besides, such a metamaterial absorber could be readily used as a
selective TPV emitter at high temperatures. By using the designed
metamaterial as the selective solar absorber, which efficiently converts
solar energy to heat, and as the selective TPV emitter, which gives photons
with energy only above the bandgap of a photovoltaic cell, the performance
of a solar TPV system could be greatly enhanced. Finally, a film-coupled
metamaterial solar cell is proposed with an ultrathin active semiconductor
layer with thickness less than 100 nm. Plasmonic light trapping due to
excitation of MP, which strongly localizes light inside the active layer
above the semiconductor bandgap, is achieved, leading to enhanced optical
absorption in ultrathin solar cells and improved electric power generation.
简历：
Dr. Liping Wang completed his undergraduate study at University of Science
and Technology of China in 2004, followed by a Master degree at the Chinese
Academy of Science in 2007. Dr. Wang received his Ph.D. in mechanical
engineering with a focus on nanoscale radiative heat transfer in December
2011 at Georgia Institute of Technology under the guidance of Professor
Zhuomin Zhang. He started his academic career as an assistant professor at
Arizona State University in July 2012 after a short stay in Prof. Zhang’s
group as a postdoctoral fellow. Dr. Wang’s research aims to selectively
control thermal radiation for energy and sensing applications by
fundamentally understanding and exploring novel physical mechanisms in
nanoscale radiative transport with nanoengineered materials or so-called
metamaterials. Besides, he has been investigating near-field thermal
radiation for energy harvesting and thermal management applications, in
addition to the development of novel optical metrologies for thermal
characterizations. Dr. Wang is currently the director of the Nano-Engineered
Thermal Radiation Lab and the lead principal investigator for ASU’s
participation in the US-Australia Solar Energy Collaboration on Micro Urban
Solar Integrated Concentrator project, sponsored by Australian Renewable
Energy Agency. His research findings have been published in more than 30
peer-reviewed high-impact journal papers in applied physics, optics, and
heat transfer. He is the recipient of the most prestigious 2015 CAREER award
by the US National Science of Foundation for recognizing junior faculty who
exemplify the role of teacher-scholars through the integration of
outstanding research and excellent education, as well as 2011 ASME
NanoEngineering Council Best Poster Award and 2010 Hartnett-Irvine Best
Paper Award. Dr. Wang won 2013 Top 5% ASU Engineering Faculty Teaching Award
for his teaching excellence. Besides, he has been actively contributing to
the professional community by organizing technical conferences and reviewing
scientific manuscripts.