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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 1, Iss. 4 — Aug. 18, 1997
  • pp: 97–101
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Long-wavelength infrared (~10-15 μm) electroluminescence from Sb-based interband cascade devices

D. Zhang, E. Dupont, R. Q. Yang, H. C. Liu, C.-H. Lin, M. Buchanan, and S. S. Pei  »View Author Affiliations


Optics Express, Vol. 1, Issue 4, pp. 97-101 (1997)
http://dx.doi.org/10.1364/OE.1.000097


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Abstract

Electroluminescence in the long-wavelength infrared (10-15 μm) spectrum region was observed from Sb-based type-II interband cascade quantum well structures. The device structure was grown by molecular beam epitaxy on a GaSb substrate and comprises 10 repeated periods of active regions separated by digitally graded multilayer injection regions. The devices have been operated at 300 K and 77 K, with an output optical power up to 50 nW. The emission wavelength, the longest observed in any compound semiconductor material at room temperature, results from tailoring the heterostructure, demonstrating a unique capability of this Sb-family type-II material system.

© Optical Society of America

The emission wavelength of the semiconductor lasers developed to date is mainly in the near infrared (IR). Efficient semiconductor light sources for the longer wavelength (> 3 μm) IR spectrum region are in growing demand for many military and commercial applications. Conventionally, narrow band-gap semiconductor materials, primarily IV-VI lead salts, [1

1. Z. Shi, M. Tacke, A. Lambrecht, and H. Bottner, “Mid-infrared lead salt multi-quantum-well diode lasers with 282 K operation,” Appl. Phys. Lett. 66, 2537–2539 (1995). [CrossRef]

,2

2. Z. Feit, M. McDonald, R. J. Woods, V. Archambault, and P. Mak, “Low threshold PbEuSeTe/PbTe separate confinement buried heterostructure diode lasers,” Appl. Phys. Lett. 68, 738–740 (1996). [CrossRef]

] are employed for such long wavelength IR emitters. However, the rather poor quality of these narrow band-gap materials limits their performance. The demonstration of a quantum cascade (QC) laser, [3

3. J. Faist, F. Capasso, D. L. Sivco, C. Sirtori, A. L. Hutchinson, and A. Y. Cho, “Quantum cascade laser,” Science 264, 553–556 (1994); “Quantum cascade laser: An intersub-band semiconductor laser operating above liquid nitrogen temperature,” Electron. Lett. 30, 865–866 (1994). [CrossRef] [PubMed]

] based on intersubband transitions in semiconductor quantum well (QW) staircase structures made of relatively wide band-gap III-V compounds, [4–6

4. L. Esaki and R. Tsu, “Superlattice and negative differential conductivity in semiconductors,” IBM J. Res. Dev. 14, 61–65 (1970). [CrossRef]

] opened a new door towards efficient long-wavelength IR light sources. In contrast to conventional diode lasers, the wavelength of intersubband lasers is determined by the small energy separation of conduction subbands arising from quantum confinement in QWs rather than the band-gap of the material. Therefore, the lasing wavelength can in principle be tailored over a wide spectral range from mid-IR to sub-millimeter by merely changing the QW layer thickness. Another distinct feature of the intersubband QC laser is that each injected electron is reused with the possibility of generating an additional photon as it cascades down a step of the energy staircase. The recent demonstrations of room temperature high power, and distributed feedback (DFB) QC lasers at λ ~ 5 and 8 μm, [7–9

7. J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, S. G. Chu, and A. Y. Cho, “High power mid-infrared (λ~5μm) quantum cascade lasers operating above room temperature”, Appl. Phys. Lett. 68, 3680–3682 (1996). [CrossRef]

] and a long wavelength (~11 μm) QC laser operating up to 200 K, [10

10. C. Sirtori, J. Faist, F. Capasso, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, “Long wavelength infrared (;~11μm) quantum cascade lasers”, Appl. Phys. Lett . 69, 2810–2812 (1996). [CrossRef]

] indicate the great potential of the QC configuration.

An alternative approach, utilizing optical transitions between an electron state in the conduction band and a hole state in the valence band in a staircase of Sb-based type-II QW structures as originally proposed by Yang, [11

11. R. Q. Yang, “Infrared laser based on intersubband transitions in quantum wells”, Superlattices and Microstruct. 17, 77–83 (1995).

] represents another fundamentally new class of semiconductor long-wavelength IR light sources for practical applications. The so-called interband cascade lasers (or type-II QC lasers) retain the advantages of cascade injection and the ability to tailor the emission wavelength, [11–13

11. R. Q. Yang, “Infrared laser based on intersubband transitions in quantum wells”, Superlattices and Microstruct. 17, 77–83 (1995).

] while circumventing the fast phonon scattering loss of the type-I intersubband QC laser, and possibly leading to higher radiative efficiency. Following the observation of mid-IR electroluminescence from interband cascade devices, [14–16

14. R. Q. Yang, C.-H. Lin, P. C. Chang, S. J. Murry, D. Zhang, S. S. Pei, S. R. Kurtz, S. N. G. Chu, and F. Ren, “Mid-IR interband cascade electroluminescence in type-II quantum well,” Electron. Lett. 32, 1621–1622 (1996). [CrossRef]

] the first interband cascade laser based on InAs/GaInSb/AlSb type-II QW structures was demonstrated at temperatures up to 170 K in early 1997. [17

17. C.-H. Lin, R. Q. Yang, D. Zhang, S. J. Murry, S. S. Pei, A. A. Allerman, and S. R. Kurtz, “Type-II interband quantum cascade laser at 3.8 μm”, Electron. Lett. 33, 598–599 (1997). [CrossRef]

] The latest demonstration of large peak output powers (e.g. ~0.5 W/facet at a emitting wavelength of ~3.9 μm) and high differential external quantum efficiencies (each injected electron can generate ~1.3 photons) from interband cascade lasers with improved designs and material quality indicates a significant improvement in a short period of time. [18

18. C. L. Felix, W. W. Bewley, I. Vurgaftman, J. R. Meyer, D. Zhang, C. -H. Lin, R. Q. Yang, and S. S. Pei, “Interband cascade laser emitting > 1 photon per injected electron”, IEEE Photonics Technol. Lett. (in press, 1997). [CrossRef]

,19

19. R. Q. Yang, B. H. Yang, D. Zhang, C.-H. Lin, S. J. Murry, H. Wu, and S. S. Pei, “High power mid-IR interband cascade lasers based on type-II quantum wells”, Appl. Phys. Lett. (in press, 1997). [CrossRef]

] In this work, we report the observation of electroluminescence in the 10-15 μm IR spectrum from a type-II interband cascade structure as shown in Fig. 1.

Fig. 1 Interband cascade structure based on InAs/GaInSb/AlSb type-II QWs under a forward bias.

The device sample was grown in a Riber 32 MBE system on a rotating p-type GaSb substrate. The substrate temperature was kept at about 440°C which was adjusted for the growths of the InAs, GaSb and AlSb layers. The V/III beam equilibrium pressure (BEP) ratio for InAs layer was about 3, and was about 2 for GaSb. Reflection high energy electron diffraction (RHEED) was used to monitor the growth in situ. The RHEED pattern was 2×1 for InAs layers and 1×3 for Ga(In)Sb and AlSb layers. Automated shutter sequencing was employed at interface interruptions to ensure interface quality. After growth, the wafer was annealed at an elevated substrate temperature to improve material quality. High resolution double crystal X-ray diffraction experiment was then used to characterize the material quality.

Fig. 2 Electroluminescence spectra of the type-II QC LED at 77K. Inset: the optical output power-current and the current-voltage characteristics.

Then the sample was made into devices with a mesa size of 0.4 × 0.9 mm2. Current pulses 1.5 μs long were injected into the QC device at 20 kHz repetition rate (3% duty-cycle). The light emitted from the surface was collected by a f/2 ZnSe lens and monitored by a HgCdTe detector. As shown in Fig. 2, the luminescence spectrum of the cascade device at 77 K shows peaks at a wavelength of ~11 μm under various driving currents ranging from 0.1A to 1A. The full width at half-maximum (FWHM) of the peaks under different injection currents are all in the 23-26 meV range. The inset shows the current-voltage characteristics as well as the optical output power as a function of the driving current. The peak output power is about 50 nW under a driving current of 1 A. We have corrected for all the known losses due to reflection by the lens and dewar window; however, we have not corrected for the finite collection cone solid angle because the radiation pattern is not known accurately. The estimated collection efficiency is about 1 × 10-3. The observed power is considerably higher than the maximum power reported for intersubband QC LEDs, [20–22

20. J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, A. L. Hutchinson, S.-N. G. Chu, and A. Y. Cho, “Mid-infrared field-tunable intersubband electroluminescence at room temperature by photon-assisted tunneling in coupled-quantum wells”, Appl. Phys. Lett. 64, 1144–1146 (1994). [CrossRef]

] suggesting an improved radiative efficiency. In contrast to the previously reported type-II QC LEDs with a similar design but emitting at shorter wavelengths (~ 6-7 μm), [15

15. R. Q. Yang, C.-H. Lin, S. J. Murry, S. S. Pei, H. C. Liu, M. Buchanan, and E. Dupont, “Interband cascade light emitting diodes in the 5-8 μm spectrum region”, Appl. Phys. Lett. 70, 2013–2015 (1997). [CrossRef]

] the blue shift of electroluminescent peak expected from the Stark effect was essentially unobservable from this device. This is not currently understood, but bears some similarity to intersubband QC devices at different emission wavelengths. [10

10. C. Sirtori, J. Faist, F. Capasso, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, “Long wavelength infrared (;~11μm) quantum cascade lasers”, Appl. Phys. Lett . 69, 2810–2812 (1996). [CrossRef]

,20

20. J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, A. L. Hutchinson, S.-N. G. Chu, and A. Y. Cho, “Mid-infrared field-tunable intersubband electroluminescence at room temperature by photon-assisted tunneling in coupled-quantum wells”, Appl. Phys. Lett. 64, 1144–1146 (1994). [CrossRef]

,21

21. C. Sirtori, F. Capasso, J. Faist, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, “Quantum cascade unipolar intersubband light emitting diodes in the 8-13 μm wavelength region”, Appl. Phys. Lett. 66, 4–6 (1995). [CrossRef]

] The current-voltage characteristics (Fig. 2, inset) observed from this device seems to indicate that leakage current is more serious in this long-wavelength IR LED compared to previously reported cascade LEDs. [15

15. R. Q. Yang, C.-H. Lin, S. J. Murry, S. S. Pei, H. C. Liu, M. Buchanan, and E. Dupont, “Interband cascade light emitting diodes in the 5-8 μm spectrum region”, Appl. Phys. Lett. 70, 2013–2015 (1997). [CrossRef]

]

The electroluminescence has also been observed at room temperature, as shown in Fig. 3. At room temperature, the spectrum becomes broader, and the emission peak wavelength red shifts to ~14 μm, due to the decrease of the band-gap. To the best of our knowledge, the observed emission wavelength from this type-II QC device is the longest ever reported in any compound semiconductor light emitting device for room temperature operation, demonstrating the unique capability of this Sb-family type-II heterostructure material system to be tailored for the desired wavelength.

Fig. 3 Electroluminescence spectrum at 300K under 1A driving current.

In summary, we have demonstrated electroluminescence in the 10-15 μm spectrum range from Sb-based type-II interband cascade devices, with a measured optical power up to 50 nW. With the addition of cladding layers and a waveguide cavity, as well as improvements in the growth process and design, interband cascade lasers operating at the long wavelength IR spectrum (8-15μm) are possible.

Acknowledgments

The authors at UH thank C.-H. Thang for the DCXRD measurements. The work at UH is supported in part by NASA under Cooperative Agreement - NCC8-127 and TcSUH. The work at QET was partially supported by Ballistic Missile Defense Organization/Innovative Science and Technology and managed by the Avionics Directorate of Wright Laboratory, Aeronautical Systems Center, USAF Wright-Patterson AFB OH 45433 with contract No. F33615-96-C-1904.

References and links

1.

Z. Shi, M. Tacke, A. Lambrecht, and H. Bottner, “Mid-infrared lead salt multi-quantum-well diode lasers with 282 K operation,” Appl. Phys. Lett. 66, 2537–2539 (1995). [CrossRef]

2.

Z. Feit, M. McDonald, R. J. Woods, V. Archambault, and P. Mak, “Low threshold PbEuSeTe/PbTe separate confinement buried heterostructure diode lasers,” Appl. Phys. Lett. 68, 738–740 (1996). [CrossRef]

3.

J. Faist, F. Capasso, D. L. Sivco, C. Sirtori, A. L. Hutchinson, and A. Y. Cho, “Quantum cascade laser,” Science 264, 553–556 (1994); “Quantum cascade laser: An intersub-band semiconductor laser operating above liquid nitrogen temperature,” Electron. Lett. 30, 865–866 (1994). [CrossRef] [PubMed]

4.

L. Esaki and R. Tsu, “Superlattice and negative differential conductivity in semiconductors,” IBM J. Res. Dev. 14, 61–65 (1970). [CrossRef]

5.

R. F. Kazarinov and R. A. Suris, “Possibility of amplification of electromagnetic waves in a semiconductor with a superlattice,” Sov. Phys. Semicond. 5, 707–709 (1971).

6.

R. F. Kazarinov and R. A. Suris, “Electric and electromagnetic properties of semiconductors with a superlattice,” Sov. Phys. Semicond. 6, 120–131 (1972).

7.

J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, S. G. Chu, and A. Y. Cho, “High power mid-infrared (λ~5μm) quantum cascade lasers operating above room temperature”, Appl. Phys. Lett. 68, 3680–3682 (1996). [CrossRef]

8.

G. Scamarcio, F. Capasso, C. Sirtori, J. Faist, A. L. Hutchinson, D. L. Sivco, and A. Y. Cho, “High-Power Infrared (8-Micrometer Wavelength) Superlattice Lasers”, Science , 276, 773–776 (1997). [CrossRef] [PubMed]

9.

J. Faist, C. Gmachl, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, “Distributed feedback quantum cascade lasers”, Appl. Phys. Lett. 70, 2670–2672 (1997). [CrossRef]

10.

C. Sirtori, J. Faist, F. Capasso, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, “Long wavelength infrared (;~11μm) quantum cascade lasers”, Appl. Phys. Lett . 69, 2810–2812 (1996). [CrossRef]

11.

R. Q. Yang, “Infrared laser based on intersubband transitions in quantum wells”, Superlattices and Microstruct. 17, 77–83 (1995).

12.

J. R. Meyer, I. Vurgaftman, R. Q. Yang, and L. R. Ram-Mohan, “Type-II and type-I interband cascade lasers,” Electron. Lett. 32, 45–46 (1996). [CrossRef]

13.

R. Q. Yang and S. S. Pei, “Novel type-II quantum cascade lasers,” J. Appl. Phys. 79, 8197–8203 (1996). [CrossRef]

14.

R. Q. Yang, C.-H. Lin, P. C. Chang, S. J. Murry, D. Zhang, S. S. Pei, S. R. Kurtz, S. N. G. Chu, and F. Ren, “Mid-IR interband cascade electroluminescence in type-II quantum well,” Electron. Lett. 32, 1621–1622 (1996). [CrossRef]

15.

R. Q. Yang, C.-H. Lin, S. J. Murry, S. S. Pei, H. C. Liu, M. Buchanan, and E. Dupont, “Interband cascade light emitting diodes in the 5-8 μm spectrum region”, Appl. Phys. Lett. 70, 2013–2015 (1997). [CrossRef]

16.

R. Q. Yang, C.-H. Lin, S. J. Murry, D. Zhang, S. S. Pei, E. Dupont, H. C. Liu, and M. Buchanan, “Long-wavelength IR interband cascade light emitting diodes”, In-Plane Semiconductor Lasers: from Ultraviolet to Midinfrared, H. K. Choi and P. S. Zory, ed. Proc. SPIE3001, 282–288 (1997). [CrossRef]

17.

C.-H. Lin, R. Q. Yang, D. Zhang, S. J. Murry, S. S. Pei, A. A. Allerman, and S. R. Kurtz, “Type-II interband quantum cascade laser at 3.8 μm”, Electron. Lett. 33, 598–599 (1997). [CrossRef]

18.

C. L. Felix, W. W. Bewley, I. Vurgaftman, J. R. Meyer, D. Zhang, C. -H. Lin, R. Q. Yang, and S. S. Pei, “Interband cascade laser emitting > 1 photon per injected electron”, IEEE Photonics Technol. Lett. (in press, 1997). [CrossRef]

19.

R. Q. Yang, B. H. Yang, D. Zhang, C.-H. Lin, S. J. Murry, H. Wu, and S. S. Pei, “High power mid-IR interband cascade lasers based on type-II quantum wells”, Appl. Phys. Lett. (in press, 1997). [CrossRef]

20.

J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, A. L. Hutchinson, S.-N. G. Chu, and A. Y. Cho, “Mid-infrared field-tunable intersubband electroluminescence at room temperature by photon-assisted tunneling in coupled-quantum wells”, Appl. Phys. Lett. 64, 1144–1146 (1994). [CrossRef]

21.

C. Sirtori, F. Capasso, J. Faist, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, “Quantum cascade unipolar intersubband light emitting diodes in the 8-13 μm wavelength region”, Appl. Phys. Lett. 66, 4–6 (1995). [CrossRef]

22.

G. Scamarcio, F. Capasso, J. Faist, C. Sirtori, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, “Tunable interminiband infrared emission in superlattice electron transport”, Appl. Phys. Lett. 70, 1796–1798 (1997). [CrossRef]

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Focus Issue: Mid-IR laser materials

History
Original Manuscript: July 30, 1997
Published: August 18, 1997

Citation
Dongxu Zhang, Rui Yang, C. -H. Lin, Shin-Shem Pei, Emmanuel Dupont, H. Liu, and M. Buchanan, "Long-wavelength infrared (~10-15 mm) electroluminescence from Sb-based interband cascade devices," Opt. Express 1, 97-101 (1997)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-1-4-97


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References

  1. Z. Shi, M. Tacke, A. Lambrecht, and H. Bottner, "Mid-infrared lead salt multi-quantum-well diode lasers with 282 K operation," Appl. Phys. Lett. 66, 2537-2539 (1995). [CrossRef]
  2. Z. Feit, M. McDonald, R. J. Woods, V. Archambault, and P. Mak, "Low threshold PbEuSeTe/PbTe separate confinement buried heterostructure diode lasers," Appl. Phys. Lett. 68, 738-740 (1996). [CrossRef]
  3. J. Faist, F. Capasso, D. L. Sivco, C. Sirtori, A. L. Hutchinson, and A. Y. Cho, "Quantum cascade laser," Science 264, 553-556 (1994); "Quantum cascade laser: An intersub-band semiconductor laser operating above liquid nitrogen temperature," Electron. Lett. 30, 865-866 (1994). [CrossRef] [PubMed]
  4. L. Esaki and R. Tsu, "Superlattice and negative differential conductivity in semiconductors," IBM J. Res. Dev. 14, 61-65 (1970). [CrossRef]
  5. R. F. Kazarinov and R. A. Suris, "Possibility of amplification of electromagnetic waves in a semiconductor with a superlattice," Sov. Phys. Semicond. 5, 707-709 (1971).
  6. R. F. Kazarinov and R. A. Suris, "Electric and electromagnetic properties of semiconductors with a superlattice," Sov. Phys. Semicond. 6, 120-131 (1972).
  7. J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, S. G. Chu, and A. Y. Cho, High power mid-infrared (l~5mm) quantum cascade lasers operating above room temperature, Appl. Phys. Lett. 68, 3680-3682 (1996). [CrossRef]
  8. G. Scamarcio, F. Capasso, C. Sirtori, J. Faist, A. L. Hutchinson, D. L. Sivco, and A. Y. Cho, High-Power Infrared (8-Micrometer Wavelength) Superlattice Lasers, Science, 276, 773-776 (1997). [CrossRef] [PubMed]
  9. J. Faist, C. Gmachl, F. Capasso, C. Sirtori, D. L. Sivco, J. N. Baillargeon, and A. Y. Cho, Distributed feedback quantum cascade lasers, Appl. Phys. Lett. 70, 2670-2672 (1997). [CrossRef]
  10. C. Sirtori, J. Faist, F. Capasso, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, Long wavelength infrared (l~11mm) quantum cascade lasers, Appl. Phys. Lett. 69, 2810-2812 (1996). [CrossRef]
  11. R. Q. Yang, "Infrared laser based on intersubband transitions in quantum wells", Superlattices and Microstruct. 17, 77-83 (1995).
  12. J. R. Meyer, I. Vurgaftman, R. Q. Yang, and L. R. Ram-Mohan, "Type-II and type-I interband cascade lasers," Electron. Lett. 32, 45-46 (1996). [CrossRef]
  13. R. Q. Yang and S. S. Pei, "Novel type-II quantum cascade lasers," J. Appl. Phys. 79, 8197-8203 (1996). [CrossRef]
  14. R. Q. Yang, C.-H. Lin, P. C. Chang, S. J. Murry, D. Zhang, S. S. Pei, S. R. Kurtz, S. N. G. Chu, and F. Ren, "Mid-IR interband cascade electroluminescence in type-II quantum well," Electron. Lett. 32, 1621-1622 (1996). [CrossRef]
  15. R. Q. Yang, C.-H. Lin, S. J. Murry, S. S. Pei, H. C. Liu, M. Buchanan, and E. Dupont, "Interband cascade light emitting diodes in the 5-8 mm spectrum region", Appl. Phys. Lett. 70, 2013-2015 (1997). [CrossRef]
  16. R. Q. Yang, C.-H. Lin, S. J. Murry, D. Zhang, S. S. Pei, E. Dupont, H. C. Liu and M. Buchanan, Long-wavelength IR interband cascade light emitting diodes, In-Plane Semiconductor Lasers: from Ultraviolet to Midinfrared, H. K. Choi and P. S. Zory, ed. Proc. SPIE 3001, 282-288 (1997). [CrossRef]
  17. C.-H. Lin, R. Q. Yang, D. Zhang, S. J. Murry, S. S. Pei, A. A. Allerman, and S. R. Kurtz, "Type-II interband quantum cascade laser at 3.8 mm", Electron. Lett. 33, 598-599 (1997). [CrossRef]
  18. C. L. Felix, W. W. Bewley, I. Vurgaftman, J. R. Meyer, D. Zhang, C. -H. Lin, R. Q. Yang and S. S. Pei, Interband cascade laser emitting > 1 photon per injected electron, IEEE Photonics Technol. Lett. (in press, 1997). [CrossRef]
  19. R. Q. Yang, B. H. Yang, D. Zhang, C.-H. Lin, S. J. Murry, H. Wu and S. S. Pei, High power mid-IR interband cascade lasers based on type-II quantum wells, Appl. Phys. Lett. (in press, 1997). [CrossRef]
  20. J. Faist, F. Capasso, C. Sirtori, D. L. Sivco, A. L. Hutchinson, S.-N. G. Chu, and A. Y. Cho, Mid-infrared field-tunable intersubband electroluminescence at room temperature by photon-assisted tunneling in coupled-quantum wells, Appl. Phys. Lett. 64, 1144-1146 (1994). [CrossRef]
  21. C. Sirtori, F. Capasso, J. Faist, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, Quantum cascade unipolar intersubband light emitting diodes in the 8-13 mm wavelength region, Appl. Phys. Lett. 66, 4-6 (1995). [CrossRef]
  22. G. Scamarcio, F. Capasso, J. Faist, C. Sirtori, D. L. Sivco, A. L. Hutchinson, and A. Y. Cho, Tunable interminiband infrared emission in superlattice electron transport, Appl. Phys. Lett. 70, 1796-1798 (1997). [CrossRef]

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