Academic Profile

Employment:

2013.9 - current Assistant Professor, ECE, University of Wisconsin - Madison
2012.9 - 2013.8 Physical Science Research Associate, Ginzton Lab, Stanford University
2009.10 - 2012.7 Postdoc, Electrical Engineering, Stanford University

Education:

2009 Ph. D.   Applied Physics,  Stanford University      Thesis advisor: Shanhui Fan

2008 M.S.     Management Science and Engineering,    Stanford University

2004 B.S.       Physics, University of Science and Technology of China


News

"Energy efficient nanophotonics: Engineered light–matter interaction in sub-wavelength structures"

Special issue in Optics Communication is online (Dec 2013). (edited by Chad Husko, Zongfu Yu and Shanhui Fan)


Research:

Interest:

1.Optical Sciences at small scale

2.Optical Technologies for energy conversion and imaging/sensing.

Area of expertise:

1.Theoretical and numerical modeling of optical waves in complex media.

2.Design and implementation of novel optoelectronic devices with advanced functionalities.

Examples from current research:
1. energy conversion: optics for improving solar energy conversion efficiency 
2. photodetectors: low jittering single photon detector, angle and spectral sensing detectors
3. thermal emission: coherent effects in thermal emission; passive cooling technologies 
4. optics in  2D materials 
5. advanced spectroscopy 

Highlights from past research:
1. Linear optical isolators entirely based on silicon for CMOS integrated Si photonics 
Nat. Photon. 7, 579 (2013); PRL 109, 033901 (2012); Science 335, 38, (2012); Nat. Photon. 5, 517 (2011); Nat. Photon. 3, 91 (2009);

2. General light trapping theory beyond 4n^2 limit and designs of nanocone solar cells 

PRL  109,173901 (2012); PNAS 107, 17491 (2010);Nano Lett. 9, 279 (2009);


4. Light extraction techniques for efficient thermal radiation

Nat. Comm. 4, 1730 (2013); Nat. Comm. 4, 2630 (2013).


5. Magnetic effects with photons: one-way waveguide, effective magnetic field, analog of quantum Hall effect,  

 Nat. Photon. 6, 782 (2012); PRL 108,153901 (2012); PRL, 100, 23902 (2008);


6. Optical antenna theory and applications for single-molecule fluorescence 

PRL 108, 083902 (2012); Nat. Photon. 3, 654, (2009); 



 
 
 

Research group:

Zongfu Yu leads the nanophotonics group at University of Wisconsin - Madison, ECE department

Members: Ming Zhou (mzhou34@), Soongyu Yi (syi5@), Zhu Wang (zwang327@), Zongfu Yu(zyu54@)  

(Add wisc.edu after @ for Email Address) 


Publications: 

Journal Publications: Google Scholar


2014:

63.C. Sigler, J. D. Kirch, T. Earles, L. J. Mawst, Z. Yu, and D. Botez "Design for high-power, single-lobe, grating-surface-emitting quantum cascade lasers enabled by plasmon-enhanced absorption of antisymmetric modes" Applied Physics Letters, 104, 131108 (2014).


62.Huang, Siya, Hui Wu, Ming Zhou, Chunsong Zhao, Zongfu Yu, Zhichao Ruan, and Wei Pan. "A flexible and transparent ceramic nanobelt network for soft electronics." NPG Asia Materials 6, no. 2 e86 (2014)


61. Zongfu Yu, Sunil Sandhu, and Shanhui Fan "Efficiency above the Shockley–Queisser Limit by Using Nanophotonic Effects To Create Multiple Effective Bandgaps With a Single Semiconductor", Nano Letters 14, 66 (2014).


60. Suni Sandhu, Zongfu Yu, and Shanhui Fan "Detailed Balance Analysis and Enhancement of Open-Circuit Voltage in Single-Nanowire Solar Cells", Nano Letters DOI: 10.1021/nl404501w (2014).

59. Wang Ken Xingze, Zongfu Yu, Victor Liu, Mark L. Brongersma, Thomas F. Jaramillo, and Shanhui Fan. "Nearly Total Solar Absorption in Ultrathin Nanostructured Iron Oxide for Efficient Photoelectrochemical Water Splitting."ACS Photonics (2014).

2013:

58. Zongfu Yu, Nicholas Sergeant, Torbjorn Skauli, Gang Zhang, Hailiang Wang, and Shanhui Fan "Thermal Extraction: enhancing thermal emission of a macroscopic blackbody to far-field vacuum ", Nature Communication 4, 1730 (2013).


57. Xi Shi, Dezhuan Han, Yunyun Dai, Zongfu Yu, Yong Sun, Hong Chen, Xiaohan Liu, and Jian Zi, "Plasmonic analog of electromagnetically induced transparency in nanostructure graphene," Opt. Express 21, 28438-28443 (2013) 

56. Kejie Fang, Zongfu Yu, and Shanhui Fan "Photonic de Haas-van Alphen effect", Optics Express, 21, 18216-18224 (2013).

55. Hui Wu, Desheng Kong, Zhichao Ruan, Po-Chun Hsu, Shuang Wang, Zongfu Yu, Thomas J Carney, Liangbing Hu, Shanhui Fan, Yi Cui "A transparent electrode based on nanotrough network", Nature Nanotechnology 8, 421 (2013).


54. Dirk Jalas, Alexander Petrov, Manfred Eich, Wolfgand Fredue, Shanhui Fan, Zongfu Yu, Roel Baets, Milos Popovic, Andrea Melloni, John D. Joannopoulos, Mathias Vanwolleghem, Christopher R. Doerr, and Hagen Renner, "What is and what is not an optical isolator", Nature Photonics, 7, 579 (2013)

53. Kevin A. Arpin, Mark D. Losego, Andrew N. Cloud, Hailong Ning, Justin Mallek, Nicholas P. Sergeant, Linxiao Zhu, Zongfu Yu, Berç Kalanyan, Gregory N. Parsons, Gregory S. Girolami, John R. Abelson, Shanhui Fan, and Paul V. Braun.  "Three-Dimensional Self-Assembled Photonic Crystals with High Temperature Stability for Thermal Emission Modification"  Nature Communications 4, 2630 (2013)

52 Kejie Fang, Zongfu Yu, and Shanhui Fan “Experimental Demonstration of a Photonic Aharonov-Bohm Effect”, Physical Review B, Rapid Communication, vol. 87, art. No. 060301 (2013)

51. Sunil Sandhu, Zongfu Yu and Shanhui Fan, “Detailed balance analysis of nanophotonic solar cells”, Optics Express, vol. 21, pp. 1209-1217 (2013).
 
50. K. X. Wang, Zongfu Yu, Sunil Sandhu and Shanhui Fan, “Fundamental Bounds on Decay Rates in Asymmetric Single-Mode Optical Resonators”, Optics Letters, vol. 38, pp. 100-102 (2013)

49. Cha, Judy J., Kristie J. Koski, Kevin CY Huang, Ken Xingze Wang, Weidong Luo, Desheng Kong, Zongfu Yu, Shanhui Fan, Mark L. Brongersma, and Yi Cui. "Two-Dimensional Chalcogenide Nanoplates as Tunable Metamaterials via Chemical Intercalation." Nano letters 13, no. 12 : 5913-5918. (2013)

2012:

45. Zongfu Yu, A. Raman, S. Fan "Thermodynamic upper bound on broadband light coupling with photonic structures" Physical Review Letters, 109,173901 (2012)


44. Zongfu Yu and Shanhui Fan "Photonic Transition in Nanophotonics" Book Chapter Nonlinear Photonics and Novel Optical Phenomena,Springer Series in Optical Sciences (2012)


43. Kejie Fang, Zongfu Yu, and Shanhui Fan " Realizing effective magnetic field for photons by controlling the phase of dynamic modulation" Nature Photonics6, 782 (2012).


42. H. Lira, Zongfu Yu, S. Fan and M. Lipson "Electro-optical silicon isolator" Physical Review Letters, 109, 033901 (2012).


41. K. Wang, Zongfu Yu, V. Liu, Y. Cui, S. Fan "Absorption Enhancement in Ultrathin Crystalline Silicon Solar Cells with Antireflection and Light trapping Nanocone Gratings" Nano Letters, Feb, ASAP (2012).


40. K. Fang, Zongfu Yu, S. Fan " Photonic Aharonov-Bohm effect based on dynamic modulation" Physical Review Letters, 108,153901 (2012).


39. L. Verslegers, Zongfu Yu, Z. Ruan, P. Catrysse, S. Fan " From Electromagnetically Induced Transparency to Superscattering with a Single Structure: A Coupled-Mode Theory for Doubly Resonant Structures", Physical Review Letters, 108, 083902 (2012).


38. Anika Kinkhabwala, Zongfu Yu, Shanhui Fan, and W.E. Moerner " Fluorescence correlation spectroscopy at high concentrations using gold bowtie nanoantennas", Chemical Physics 415, 309(2012) 


37. S. Jeong, E. Garnett, S. Wang, Z. Yu, S. Fan, M. Brongersma, M. McGehee, and Y. Cui "Hybrid Silicon Nanocone-Polymer Solar Cells" Nano Letters 2012, 12 2971(2012) 


36. Liang, D., Huo, Y., Kang, Y., Wang, K. X., Gu, A., Tan, M., Yu, Z., Li, S., Jia, J., Bao, X., Wang, S., Yao, Y., Wong, H.-S. P., Fan, S., Cui, Y. and Harris, J. S. (2012), Optical Absorption Enhancement in Freestanding GaAs Thin Film Nanopyramid Arrays. Adv. Energy Mater. doi: 10.1002/aenm.201200022 (2012)


35. S. Fan, R. Baets, A. Petrov, Zongfu Yu, J. D. Joannopoulos, W. Freude, A. Melloni, M. Popvic, M. Vanwolleghem, D. Jalas, M. Eich, M. Krause, H. Renner, E. Brinkmeyer, C. R. Doerr  " Comment on 'Nonreciprocal Light Propagation in a Silicon Photonic Circuit' " Science, 335, 38, (2012) Technical Comments


2011:

34. Zongfu Yu, Aaswath Ramn, and Shanhui Fan, " Nanophotonic light trapping theory for solar cells", Applied Physics A, 105, 329-339, (2011). Invited


33. Zongfu Yu, and Shanhui Fan " Angular constraint on light-trapping absorption enhancement in solar cells" Applied Physics Letters 98, 011106 (2011). 


32. Zongfu Yu and Shanhui Fan "Optical Isolation: A non-magnetic approach" Nature Photonics, 5, 517-519, (2011). News & Views


31. Zongfu Yu, and Shanhui Fan "Extraordinarily high spectral sensitivity in refractive index sensors using multiple optical modes" Optics Express, 19 10029 (2011). 

 

30. Kejie Fang, Zongfu Yu, and Shanhui Fan "Microscopic theory of photonic one-way edge mode" Physical Review B, 84, 075477, (2011).


29. Aaswath Raman, Zongfu Yu, and Shanhui Fan "Dielectric nanostructures for broadband light trapping in organic solar cells" Optics Express 19, 19051, (2011).


28. Kejie Fang, Zongfu Yu, Victor Liu, and Shanhui Fan, "Ultracompact non-reciprocal optical isolator based on guided resonance in a magneto-optical photonic crystal slab" Optics Letter 36, 4254 (2011).


27. Varat Intaraprasonk, Zongfu Yu, and Shanhui Fan " Image transfer with subwavelength resolution on metal-dielectric interface" Journal of Optical Society of America B 28, 1335 (2011). 


26. Hui Wu, Liangbing Hu, Thomas Carney, Zhichao Ruan, Desheng Kong, Zongfu Yu, Yan Yao, Judy Cha, Jia Zhu, Shanhui Fan and Yi Cui "Low Reflectivity and High Flexibility of Tin-Doped Indium Oxide Nanofiber Transparent Electrodes"  Journal of American Chemical Society 133, 27 (2011).


2010:

25. Zongfu Yu, Aaswath Raman, and Shanhui Fan " Fundamental limit of nanophotonic light trapping in solar cells" PNAS 107(41) 17491-17496 (2010). 


24. Zongfu Yu and Shanhui Fan, “Integrated Non-Magnetic Optical Isolators based on Photonic Transitions”, IEEE Journal of Selected Topics in Quantum Electronics (Invited), 16, 459 (2010) 


23. Zongfu Yu and Shanhui Fan, “Optical resonances created by photonic transitions” Applied Physics Letters, 96, 011108, (2010). 


22. Zongfu Yu, Aaswath Raman, and Shanhui Fan " Fundamental limit of light trapping in grating structures" Optics Express, 18, A366 (2010).


21. Varat Intaraprasonk, Zongfu Yu, and Shanhui Fan  "Combining radiationless interference with evanescent field amplification" Optics Letters, 35, 1659 (2010)


20. L. Verslegers, P.B. Catrysse, Zongfu Yu, W. Shin, Z. Ruan and S. Fan, "Phase front design with metallic pillar arrays" Optics Letters, 35, 844,(2010).


19. Judy Cha, Zongfu Yu, Eric Smith, Martin Couillard, Shanhui Fan, and David A. Muller, "Mapping local optical densities of states in silicon photonic structures with nanoscale electron spectroscopy", Phys. Rev. B. 81,113102, (2010).


18. L. Verslegers, Zongfu Yu, P.B. Catrysse, and S. Fan "Temporal coupled-mode theory for resonant apertures" Journal of Optical Society of America-B, 27,1947 (2010).


17. Jia Zhu, Zongfu Yu, Shanhui Fan, and Yi Cui "Nanostructured Photon Management for high performance solar cells" Material Science and Engineering-R.   doi:10.1016/j.mser.2010.06.018 (2010).


16. Cao L, Fan P, Vasudev AP, White JS, Yu Z, Cai W, Schuller JA, Fan S, Brongersma ML “Semiconductor nanowire optical antenna solar absorbers”, 10(2), 439 Nano Letters (2010). 


2009:

15.  Zongfu Yu, and Shanhui Fan “ Optical isolation based on nonreciprocal phase shift induced by interband photonic transitions” Applied Physics Letters , 94, 171116 (2009). 


14. Zongfu Yu, and Shanhui Fan “ Complete Optical Isolation created by indirect interband photonic transitions” Nature Photonics, 3, 91 (2009). 


13. A. Kinkhabwala, Zongfu Yu, S. Fan, Y. Avlasevich, K. Mullen, and W.E. Moerner “Single-molecule fluorescence enhancements produced by a Bowtie nanoantenna” Nature Photonics, 3, 654, (2009). 


12. Jia Zhu, Zongfu Yu, George F. Burkhard, Ching-Mei Hsu, Stephen T. Connor, Yueqin Xu, Qi Wang, Michael McGehee, Shanhui Fan and Yi Cui “ Optical Absorption Enhancement in Amorphous Silicon Nanowire Arrays ” Nano Letters  9 (1), pp 279–282 (2009). 


11. Georgios Veronis, Zongfu Yu, Sukru Ekin Kocabas, David A. B. Miller, Mark L. Brongersma, and Shanhui Fan “ Metal-dielectric-metal plasmonic waveguide devices for manipulating light at the nanoscale” Chinese Optics Letters (Invited Paper), 7, 302,(2009). 


10. Jia Zhu, Ching-Mei Hsu, Zongfu Yu, Shanhui Fan and Yi Cui “Nanodome solar cells with efficient light management and self-cleaning”, Nano Letters, DOI: 10.1021/nl9034237, Nov (2009). 


9. White JS, Veronis G, Yu Z, Barnard ES, Chandran A, Fan S, Brongersma ML “Extraordinary optical absorption through subwavelength slits”, Optics Letters, 34 (5): 686-8 (2009). 


8. L. Verslegers, P.B. Catrysse, Z. Yu and S. Fan “ Deep-subwavelength focusing and steering of light in aperiodic metallic waveguide array”, Physical Review Letters, 103, 033902 (2009). 


7. P.B. Catrysse, L. Verslegers, Z. Yu, J. S. White, E. S. Barnard, M. L. Brongersma, and S. Fan, "Planar lenses based on nanoscale slit arrays in a metallic film", Optics and Photonics News, 20, 24, (2009)


6. L. Verslegers, P.B. Catrysse, Z. Yu and S. Fan “ Planar metallic nanoscale slit lenses for angle compenstation”, Applied Physics Letters, 95, 071112 (2009). 


5. Lieven Verslegers, Peter B. Catrysse, Zongfu Yu, Justin S. White, Edward S. Barnard, Mark L. Brongersma and Shanhui Fan “ Planar Lenes Based on Nanoscale Slit Arrays in a Metallic Film” Nano Letters, 9(1), pp 235-238 (2009). 


2008:

4. Zongfu Yu, G. Veronis, Z. Wang and S. Fan “One-way electromagnetic waveguide formed at the interface between a plasmonic metal under static magnetic field and a photonic crystal”, Physical Review Letters, 100, 23902 (2008). 


3. Zongfu Yu, G. Veronis, M. L. Brongersma, and S. Fan “Gain-induced switching in metal-dielectric-metal plasmonic waveguide”  Applied Physics Letters 92, 041117 (2008). 


2007:

2. Zongfu Yu, Z. Wang and S. Fan “One-way total reflection with one-dimensional magneto-optical photonic crystals” Applied Physics Letters 90, 121133 (2007). 


2006:

1. Zongfu Yu, G. Veronis, M. L. Brongersma, and S. Fan “Design of mid-infrared photodetectors enhanced by surface plasmons on grating structures” Applied Physics Letters 89, 151116 (2006). 



Recent invited talks


9. PECS-XI The 11st International Symposium on Photonic and Electromagnetic Crystal Structure "Superradiant thermal emission and absorption suppression" Shanghai, China, May.2014


8. KAIST EEWS Int’l workshop on next-generation photovoltaics “Nanophotonics for enhancing photocurrent and voltage”, Daejeon, Korea, Oct. 2013. 


7. SPIE Photonic North “Nanophotonic light trapping and thermal extraction” Ottawa, Canada, June 2013. 


6.IEEE Photonics Conference (LEOS) “Managing sunlight and thermal emission with broadband nanophotonics”,  San Francisco, CA, 2012. 


5. OSA (Optical Society of America) Annual Meeting “Light trapping for managing broadband radiation: sunlight and thermal radiation” Rochester, NY, 2011. 


4. MRS (Materials Research Society) Fall Meeting “Wave domain light trapping theory”, Boston, MA, 2011. 


3. IEEE 35th Photovoltaics Specialist Conference “Nanodome Solar Cells with Efficient Light Harvesting”, 30 minutes Extended Talk, Honolulu, HI, 2010. 


2. NNIN National Nanotechnology Infrastructure Network workshop “Nanophotonics Theory and Simulations”, Stanford University, Stanford, CA, 2010. 


1. SPIE Photonics West “Dynamic photonic structures for integrated photonics”, San Francisco, CA, 2010