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Journal Articles

  1. K. Feng*, G. Harden*, D.L. Sivco, and A.J. Hoffman, “Sub-diffraction Confinement in All-semiconductor Hyperbolic Metamaterial Resonators,” ACS Photonics 4, 1621-1626 (2017).
  2. Y.I. Cui*, M.P. Harter*, Y. Dikmelik, and A.J. Hoffman, “Importance of Coherence in Models of Mid-infrared Quantum Cascade Lasers Gain Spectra,” Journal of Optics Accepted
  3. O. Dominguez*, T.L. McGinnity, R.K. Roeder, and A.J. Hoffman, “Optical characterization of polar HfO2 nanoparticles in the mid- and far-infrared,” Applied Physics Letters 111, 011101 (2017).
  4. T. Ahmed, T. Liu, T.P. Butler#, J.M. Kulick, G.H. Bernstein, A.J. Hoffman, D.C. Hall, and S.S. Howard, “Mid-infrared Waveguide Array Inter-Chip Coupling Using Optical Quilt Packaging,” IEEE Photonics Technology Letters 29, 755-758 (2017).
  5. G. Harden*, L. Cortes-Herrera#, and A.J. Hoffman, “Optical pathlength and trajectory stability in rotationally asymmetric multipass cells,” Optics Express 24, 19497 (2016).
  6. T.L. McGinnity, O. Dominguez*, T.E. Curtis, P. Nallathamby, A.J. Hoffman, and R.K. Roeder, “Hafnia (HfO2) nanoparticles as an X-ray contrast agent and mid-infrared phononic material,” Nanoscale 8, 13627 (2016).
  7. W. Streyer, K. Feng*, Y. Zhong, A.J. Hoffman, and D. Wasserman, “Engineering the Reststrahlen band with hybrid plasmon/phonon excitations,” MRS Communications 6, 1-8 2015.
  8. K. Feng*, W. Streyer, Y. Zhong, A.J. Hoffman, and D. Wasserman, “Photonics materials, structures, and devices for Reststrahlen optics,” Optical Materials Express 23, A1418 (2015).
  9. K. Feng*, W. Streyer, S.M. Islam, J. Verma, D. Jena, D. Wasserman, and A.J. Hoffman, “Localized surface phonon polariton resonances in polar GaN,” Applied Physics Letters 107, 081108 (2015).
  10. W. Streyer, K. Feng*, Y. Zhong, A.J. Hoffman, and D. Wasserman, “Selective absorbers and thermal emitters for far-infrared wavelengths,” Applied Physics Letters 107, 081105 (2015).
  11. W. Streyer, A. Rosenberg, S. Law, C. Roberts, V.A. Podolskiy, A.J. Hoffman, and D. Wasserman, “Engineering absorption and blackbody radiation in the far-infrared with surface phonon polaritons on gallium phosphide,” Applied Physics Letters 104, 131105 (2014).
  12. Y. Yao, A.J. Hoffman, and C. Gmachl, “Mid-infrared quantum cascade lasers”, Nature Photonics 6, 432-439 (2012).
  13. A.J. Hoffman, S. Srinivasan, J. Gambetta, and A.A. Houck, “Coherent control of a superconducting qubit with dynamically tunable qubit-cavity coupling,” Physical Review B 84, 184515 (2011).
  14. A.J. Hoffman, S. Srinivasan, S. Schmidt, L. Spietz, J. Aumentado, H.E. Tureci, and A.A. Houck, “Dispersive Photon Blockade in a Superconducting Circuit,” Physical Review Letters 107, 053602 (2011).
  15. S. Srinivasan, A.J. Hoffman, J. Gambetta, and A.A. Houck, “Tunable coupling in circuit quantum electrodynamics with a superconducting V-system,” Physical Review Letters 106, 083601 (2011).
  16. M.D. Escarra, S. Thongrattanasiri, W.O. Charles, A.J. Hoffman, V.A. Podolskiy, and C. Gmachl, “Enhanced bandwidth and reduced dispersion through stacking multiple optical metamaterials,” Optics Express 19, 14990 (2011).
  17. P.Q. Liu, A.J. Hoffman, M.D. Escarra, K.J. Franz, J.B. Khurgin, Y. Dikmelik, X.J. Wang, J.-Y. Fan, C.F. Gmachl, "Highly Power-efficient Quantum Cascade Lasers," Nature Photonics 4, 95 (2010). 
  18. M.D. Escarra, A. Benz, A.M. Bhatt, A.J. Hoffman, J. Wang, J. Fan, C. Gmachl, “Thermoelectric effect in quantum cascade lasers,” IEEE Photonics Journal 2, 501 (2010).
  19. K.J. Franz, P.Q. Liu, J. Raftery, M.D. Escarra, A.J. Hoffman, S.S. Howard, Y. Yao, Y. Dikmelik, X. Wang, J. Fan, J.B. Khurgin, and C. Gmachl, “Short Injector Quantum Cascade Lasers,” IEEE Journal of Quantum Electronics 46, 591 (2010).
  20. A.J. Hoffman, P.X. Braun, M.D. Escarra, S.S. Howard, K.J. Franz, and C. Gmachl, “Lasing-induced reduction of core heating in high wall plug efficiency quantum cascade lasers,” Applied Physics Letters 94, 041101 (2009).
  21. A.J. Hoffman, L. Alekseyev, A. Sridhar, P.X. Braun, S.S. Howard, K.J. Franz, D. Wasserman, V.A. Podolskiy, E.E. Narimanov, D.L. Sivco, and C. Gmachl, “Mid-infrared Semiconductor Optical Metamaterials,” Journal of Applied Physics 105, 122411 (2009).
  22. M.D. Escarra, A.J. Hoffman, K.J. Franz, S.S. Howard, R. Cendejas, X.J. Wang, J.-Y. Fan, C. Gmachl, "Quantum cascade lasers with voltage defect of less than one longitudinal optical phonon energy," Applied Physics Letters 94, 251114 (2009).
  23. Y. Yao, Z.J. Liu, A.J. Hoffman, K.J. Franz, C.F. Gmachl "Voltage Tunability of Quantum Cascade Lasers," IEEE Journal of Quantum Electronics 45, 730 (2009). 
  24. J.B. Khurgin, Y. Dikmelik, P.Q. Liu, A.J. Hoffman, M.D. Escarra, K.J. Franz, C.F. Gmachl "Role of interface roughness in the transport and lasing characteristics of quantum-cascade lasers," Applied Physics Letters 94, 091101 (2009).
  25.  C.R. Young, R. Cendejas, S.S. Howard, W. Sanchez-Vaynshteyn, A.J. Hoffman, K.J. Franz, Y. Yao, B. Mizaikoff, X. Wang, J.-Y. Fan, C. Gmachl "Wavelength selection for quantum cascade lasers by cavity length," Applied Physics Letters 94, 091109 (2009).
  26. E.N. Bentil, F. Toor, A.J. Hoffman, M.D. Escarra, C. Gmachl, “Rapid and Minimally Invasive Quantum Cascade Wafer Testing,” IEEE Photonics Technology Letters 21, 531 (2009).
  27. K.J. Franz, S. Menzel, A.J. Hoffman, D. Wasserman, J. Cockburn, C. Gmachl "High k-space lasing in a dual wavelength quantum cascade laser," Nature Photonics 3, 50 (2008). 
  28. A.J. Hoffman, V.A. Podolskiy, D.L. Sivco, and C. Gmachl, “Sub-diffraction negative and positive index modes in mid-infrared waveguides,” Optics Express 16, 16404 (2008).
  29. S.S. Howard, D.P. Howard, A.J. Hoffman, K.J. Franz, D.L. Sivco, and C. Gmachl, “The effect of injector barrier thickness and doping level on current transport and optical transition width in a λ ~ 8 μm QC structure,” Applied Physics Letters 93, 191107 (2008).
  30. K.J. Franz, W.O. Charles, A. Shen, A.J. Hoffman, M.C. Tamargo, C. Gmachl, “ZnCdSe/ZnCdMgSe Quantum Cascade Electroluminescence,” Applied Physics Letters 92, 121105 (2008).
  31. A.J. Hoffman, S. Schartner, S.S. Howard, K.J. Franz, F. Towner, C. Gmachl, “Low voltage-defect quantum cascade Laser with heterogeneous injector regions,” Optics Express 15, 15818 (2007).
  32. A.J. Hoffman, L. Alekseyev, S.S. Howard, K.J. Franz, D. Wasserman, V.A. Podolskiy, E.E. Narimanov, D.L. Sivco, C. Gmachl, “Negative refraction in semiconductor metamaterials,” Nature Materials 6, 946 (2007).
  33. S.S. Howard, Z. Liu, D. Wasserman, A.J. Hoffman, T.S. Ko, C. Gmachl, “High-Performance Quantum Cascade Lasers: Optimized Design Through Waveguide and Thermal Modeling.” IEEE Journal Select Topics Quantum Electronics 13, 1054 (2007).
  34. K.J. Franz, D. Wasserman, A.J. Hoffman, D.C. Jangraw, K.-T. Shiu, S.R. Forest, C. Gmachl, “Evidence of cascaded emission in a dual-wavelength Quantum Cascade laser,” Applied Physics Letters 90, 091104 (2007).
  35. Z.Y. Zhao, C. Yi, A.D. Stiff-Roberts, A.J. Hoffman, D. Wasserman, C. Gmachl, “Probing dopant incorporations in InAs/GaAs QDIPs by polarization-dependent Fourier transform infrared spectroscopy,” Infrared Physics & Technology, 51, 131 (2007).
  36. Z. Liu, D. Wasserman, S. S. Howard, A. J. Hoffman, C. Gmachl, X. Wang, T. Tanbun-Ek, L. Cheng, and F. Choa. “Room temperature continuous wave quantum cascade lasers grown by MOCVD without lateral regrowth.” IEEE Photonics Technology Letters 18, 1347 (2006).