Terahertz range quantum well infrared photodetector

Graf, Marcel; Scalari, Giacomo; Hofstetter, Daniel; Faist, Jérôme; Beere, Harvey; Linfield, Edmund; Ritchie, David; Davies, Giles
January 2004
Applied Physics Letters;1/26/2004, Vol. 84 Issue 4, p475
Academic Journal
We demonstrated a GaAs/AlGaAs-based far-infrared quantum well infrared photodetector at a wavelength of λ=84 μm. The relevant intersubband transition is slightly diagonal with a dipole matrix element of 3.0 nm. At 10 K, a responsivity of 8.6 mA/W and a detectivity of 5×10[sup 7] cm [Square_Root]Hz/W have been achieved; and successful detection up to a device temperature of 50 K has been observed. Being designed for zero bias operation, this device profits from a relatively low dark current and a good noise behavior. © 2004 American Institute of Physics.


Related Articles

  • Optically controlled electroabsorption modulators for unconstrained wavelength conversion. Sabnis, V. A.; Demir, H. V.; Fidaner, O.; Harris, J. S.; Jr.; Miller, D. A. B.; Zheng, J.-F.; Li, N.; Wu, T.-C.; Chen, H.-T.; Houng, Y.-M. // Applied Physics Letters;1/26/2004, Vol. 84 Issue 4, p469 

    We introduce a proof-of-concept, optically controlled, optical switch based on the monolithic integration of a surface-illuminated photodetector and a waveguide electroabsorption modulator. We demonstrate unconstrained wavelength conversion over the entire center telecommunication wavelength...

  • Theory of photodetachment from negative ions. Ivanov, Vadim K. // AIP Conference Proceedings;2000, Vol. 500 Issue 1, p87 

    This short survey is devoted to some achievements in theoretical study of negative ion photodetachment over recent years. The results of photodetachment cross section calculations performed within various theoretical approaches are discussed. Main attention is centered on the resonances in the...

  • Threshold investigation of oxide-confined vertical-cavity laser diodes. Choquette, Kent D.; Chow, W.W. // Applied Physics Letters;6/24/1996, Vol. 68 Issue 26, p3689 

    Analyzes the threshold properties of infrared oxide-confined vertical cavity surface emitting lasers. Analysis on the wavelength dependencies of the threshold current density and intrinsic voltage; Equivalence of the threshold voltage to the quasi-Fermi energy separation and ohmic drop; Ways to...

  • Electronic transitions of C[sub 3][sup -] above the photodetachment threshold. Tulej, M.; Fulara, J.; Sobolewski, A.; Jungen, M.; Maier, J. P. // Journal of Chemical Physics;2/22/2000, Vol. 112 Issue 8 

    The A [sup 2]Δ[sub u]←X [sup 2]Π[sub g], B [sup 2]Σ[sub u][sup -]←X [sup 2]Π[sub g], and C [sup 2]Σ[sub u][sup +]←X [sup 2]Π[sub g] electronic transitions of C[sub 3][sup -] were observed in a neon matrix and in the gas phase, although the energy of the...

  • The ejection distribution of solvated electrons generated by the one-photon photodetachment of aqueous I[sup -] and two-photon ionization of the solvent. Kloepfer, J. A.; Kloepfer, J.A.; Vilchiz, V. H.; Vilchiz, V.H.; Lenchenkov, V. A.; Lenchenkov, V.A.; Germaine, A. C.; Germaine, A.C.; Bradforth, S. E.; Bradforth, S.E. // Journal of Chemical Physics;10/15/2000, Vol. 113 Issue 15 

    The ultrafast dynamics following one-photon UV photodetachment of I[sup -] ions in aqueous solution are compared with those following two-photon ionization of the solvent. Ultrafast pump-probe experiments employing 50 fs ultraviolet pulses reveal similar and very rapid time scales for electron...

  • Study of Si4 and Si4- using threshold photodetachment (ZEKE) spectroscopy. Arnold, Caroline C.; Neumark, Daniel M. // Journal of Chemical Physics;9/1/1993, Vol. 99 Issue 5, p3353 

    The threshold photodetachment (ZEKE) spectrum of Si4- is presented. Although no transitions to the ground state of Si4 are observed, we obtain detailed information on the anion and several of the low-lying excited states of neutral Si4. The spectrum shows a long progression of well-resolved...

  • Photoelectron–neutral–neutral coincidence studies of dissociative photodetachment. Hanold, K. A.; Sherwood, C. R.; Continetti, R. E. // Journal of Chemical Physics;12/8/1995, Vol. 103 Issue 22, p9876 

    Photoelectron–neutral–neutral coincidence spectra have been measured for the dissociative photodetachment of O4- (O4-+hν→O2+O2+e-) at 523 and 349 nm. The neutral photofragment translational energy spectrum, the photoelectron spectrum, and the correlations of the...

  • Comment on: Study of C-6 and C6 with threshold photodetachment spectroscopy and autodetachment spectroscopy. Liu, Ruifeng; Zhou, Xuefeng // Journal of Chemical Physics;7/15/1993, Vol. 99 Issue 2, p1440 

    Multiconfigurational ab initio calculations on the ground state linear C6 molecule indicate that the symmetric stretching modes ν2 and ν3 are significantly higher than the recent experimental assignment of Arnold et al., which suggests the results of the threshold photodetachment and...

  • Extraction of volume-produced H- ions from a hybrid magnetic multicusp source. Bacal, M.; Hillion, F. // Review of Scientific Instruments;Dec1985, Vol. 56 Issue 12, p2274 

    The negative ion density n- is studied using the photodetachment technique in the extraction region of a 5.7-l hybrid magnetic multicusp source, and is correlated with the extracted negative ion current I-. It is found that biasing positive the plasma electrode (PE) of the extractor affects in a...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics