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10 Sep 2001

Volume 79, Issue 11, pp. 1587-1734

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Formation of radially and azimuthally polarized light using space-variant subwavelength metal stripe gratings

Ze’ev Bomzon, Vladimir Kleiner, and Erez Hasman

Appl. Phys. Lett. 79, 1587 (2001); http://dx.doi.org/10.1063/1.1401091 (3 pages) | Cited 42 times

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We present a unique method for converting circularly polarized light into radially and azimuthally polarized beams. The method is based on the use of computer-generated space-variant subwavelength metal stripe gratings. The elements were realized on GaAs substrates and produced beams with high polarization purity at a wavelength of 10.6 μm. As a result of the conversion, the beams also undergo space-variant phase modification, which has an effect on their propagation. We demonstrate the effect experimentally, and calculate it using full space-variant polarization and phase analysis based on rigorous coupled-wave analysis and Jones calculus. © 2001 American Institute of Physics.
Show PACS
42.79.Ci Filters, zone plates, and polarizers
42.40.Eq Holographic optical elements; holographic gratings
42.40.Jv Computer-generated holograms
42.79.Dj Gratings
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation

Intersubband absorption in degenerately doped GaN/AlxGa1−xN coupled double quantum wells

Claire Gmachl, Hock M. Ng, and Alfred Y. Cho

Appl. Phys. Lett. 79, 1590 (2001); http://dx.doi.org/10.1063/1.1403277 (3 pages) | Cited 75 times

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Intersubband absorption in coupled GaN/AlGaN double quantum wells (DQWs) has been measured. The samples were grown by molecular-beam epitaxy on a sapphire substrate and with large (0.65 or 0.9) AlN-mole fraction in the barriers. Peak absorption wavelengths as short as 1.35 and 1.52 μm were measured for a symmetric DQW of 12 Å wide wells coupled by a 10 Å wide barrier, which also showed evidence of excited-state anticrossing. As expected, asymmetric DQWs displayed no such anticrossing, and the ground-state anticrossing energies were found to be much smaller, as a result of the comparatively large effective electron mass, than the energy broadening of individual transitions. Degenerate doping of the DQWs was used to establish a common reference energy at the Fermi level, which allows overcoming uncertainties related to intrinsic internal electric fields. The asymmetric DQWs displayed peak absorption wavelengths between 1.5 and 2.9 μm. © 2001 American Institute of Physics.
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71.55.Eq III-V semiconductors
78.66.Fd III-V semiconductors
73.21.Fg Quantum wells
78.67.De Quantum wells
61.72.uj III-V and II-VI semiconductors

Evanescent and propagating wave characteristics of the photonic quantum ring laser

B. H. Park, J. C. Ahn, J. Bae, J. Y. Kim, M. S. Kim, S. D. Baek, and O’Dae Kwon

Appl. Phys. Lett. 79, 1593 (2001); http://dx.doi.org/10.1063/1.1402655 (3 pages) | Cited 13 times

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We present the wave propagation characteristics of photonic quantum ring lasers with clear evidence of the evanescence-propagation crossover behavior. The data obtained from the fiber probe measurements of 15–36 μm disk size lasers show that the Rayleigh’s whispering gallery modes always give rise to the propagation mode, with the crossover ranges of 55–80 μm. The three-dimensional but chiral and broken z-axis symmetry nature of the photonic quantum ring cavity appears to guarantee such a crossover to the propagation in general. © 2001 American Institute of Physics.
Show PACS
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption
42.55.Px Semiconductor lasers; laser diodes
42.55.Sa Microcavity and microdisk lasers
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