Sang Han
Associate Professor
Farris Engineering Center - Room 257

505 277.3118
meister@unm.edu

 

Education:

  • Ph.D. University of California - Santa Barbara, Chemical Engineering, 1998
  • B.S. University of California - Berkeley, Chemical Engineering with Honors, 1992
 

Research

  • Selective heteroepitaxy of Ge and III-V compound semiconductors on Si for multijunction solar cells and RF applications
  • Scanning tunneling microscopy of quantum structure and film growth, and organic-inorganic hybrid systems
  • Hybrid micro/nanofluidic systems for advanced bioseparation and analysis, including high-resolution protein separations in nanofluidic FET devices
  • Nanocrystal synthesis, functionalization, and integration for nonlinear optical and biological applications

 

 

 

Professional Experience

  • 2006 - Present: Associate Professor, Department of Chemical & Nuclear Engineering • University of New Mexico, Albuquerque, NM.
  • 2000 - 2006: Assistant Professor, Department of Chemical & Nuclear Engineering • University of New Mexico, Albuquerque, NM.
  • 1999 - 2000: Post-doctoral Researcher, Lam Research Corporation • Fremont, CA.
  • 1998-99: Post-doctoral Researcher, Department of Chemical Engineering • University of California-Berkeley, CA.
  • 1993-98: Graduate Research Assistant, Department of Chemical Engineering • University of California-Santa Barbara, CA.
  • 1996: Visiting NSF Scholar, Seoul National University, Korea and Tokyo Institute of Technology, Japan.

 

Teaching

  • ChNE 101 Introduction to Chemical and Nuclear Engineering
  • ChNE 251 Chemical Process Calculations I
  • ChNE 321 Mass Transfer
  • ChNE 499/ME 461 High Performance Engines
  • ChNE 502 ChNE Research Methods Seminar
  • ChNE 515 Fundamentals of Nanofluidics
  • ChNE 515/NSMS 595 Nanoscale Quantum Structure Growth & Device Applications
  • ChNE 521 Advanced Transport Phenomena I

 

Research Details:

  • High-quality Ge Epitaxy on Si by Nanoscale Heterojunction Engineering: A Foundation for III-V Integration: Our research objective is to develop comprehensive materials engineering solutions to integrate high-quality III-V heteroepitaxial films on Si. To this end, we manipulate the growth surface at the nanoscale, significantly reducing the strain density at the mismatched heterojunction. We envision that successful integration of compound semiconductors on Si will translate to a technological breakthrough in high-mobility, high-speed transistors; multijunction solar cells; and even optical imaging devices.
  • Fundamental Understanding of Materials and Charge Transport Using Scanning Tunneling Microscopy: A Path to 3-D Integration of Active Quantum Structures: The ability to integrate nanoscale heterostructures that emit/detect photons or enable photoelectric conversion in 3-D architecture may open doors to novel devices and their performance enhancement, not easily achievable by the conventional layer-by-layer stacking approach. We focus on artificially introduced surface geometry and unique surface processes to grow nanostructures on non-planar surfaces that deviate from the typical rectangular geometry. In order to facilitate such 3-D integration, we study materials as well as charge transport on a variety of surfaces with atomic resolution.
  • Hybrid Micro/Nanofluidics for Advanced Separation and Anaysis of Biomolecules: Bioseparation strategies have evolved significantly over the past decade, and the hybrid micro/nanofluidic devices have emerged as a new separation platform that offers speed, efficiency, reduced sample consumption, and detection multiplexing. These are unique advantages over macroscopic separation strategies used in the past. In particular, nanofluidic systems provide enhanced tunability in terms of channel-wall surface charge, zeta-potential, wall-molecule electrostatic interaction, and local pH. We employ a control scheme, where a third potential is applied to a "gate" electrode surrounding the channel walls. This is very much analogous to that of field effect transistors (FETs) used in complementary metal oxide silicon (CMOS) technology. The fluidic devices that use this control scheme are hence termed fluidic FETs. Using the FET control scheme, we focus on how the unique characteristics of nanochannels influence the structure and orientation of protein molecules as well as their biofunctional activities, within the context of high-resolution separations.

Selected Publications:

  • Please see CV