Improvement of spectral efficiency based on spectral splitting in photonic quantum-well structures

Liu, J.; Sun, Jingjing; Huang, Chuanfeng; Hu, Wei; Chen, M.

doi:10.1049/iet-opt:20070056

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…However, when the wells are far away from one another, the coupling strength decreases, and eventually the splitting of degenerate states cannot be resolved. At this point that the transmission spectrum of the PDQW approaches that of an equivalent single PQW, and the bound photons can be regarded as confined to identical but separate and isolated wells [15]. Thus, we observe that the system switches from two transparent states to one transparent state as the wells are brought further apart.…”

Section: Resultsmentioning

confidence: 98%

“…Due to the photonic band mismatch between the well and the barrier, photons become confined within the well and occupy quantized states. This so-called photonic confinement effect has been observed in both theoretical [11-15] and experimental [16,17] studies and is analogous to the electronic confinement effect that occurs in semiconductor quantum wells.…”

Section: Introductionmentioning

confidence: 83%

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Resonant Tunneling in Photonic Double Quantum Well Heterostructures

Cox

Singh

2010

Nanoscale Res Lett

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Here, we study the resonant photonic states of photonic double quantum well (PDQW) heterostructures composed of two different photonic crystals. The heterostructure is denoted as B/A/B/A/B, where photonic crystals A and B act as photonic wells and barriers, respectively. The resulting band structure causes photons to become confined within the wells, where they occupy discrete quantized states. We have obtained an expression for the transmission coefficient of the PDQW heterostructure using the transfer matrix method and have found that resonant states exist within the photonic wells. These resonant states occur in split pairs, due to a coupling between degenerate states shared by each of the photonic wells. It is observed that when the resonance energy lies at a bound photonic state and the two photonic quantum wells are far away from each other, resonant states appear in the transmission spectrum of the PDQW as single peaks. However, when the wells are brought closer together, coupling between bound photonic states causes an energy-splitting effect, and the transmitted states each have two peaks. Essentially, this means that the system can be switched between single and double transparent states. We have also observed that the total number of resonant states can be controlled by varying the width of the photonic wells, and the quality factor of transmitted peaks can be drastically improved by increasing the thickness of the outer photonic barriers. It is anticipated that the resonant states described here can be used to develop new types of photonic-switching devices, optical filters, and other optoelectronic devices.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 83%

Resonant Tunneling in Photonic Double Quantum Well Heterostructures

Cox

Singh

2010

Nanoscale Res Lett

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Use of photonic quantum well as tunable defect in multilayer narrowband reflection-and-transmission filter

Chang

Liu

2010

OPT REV

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Energy splitting of resonant photonic states in nonlinear nanophotonic double waveguides

Cox

Singh

2010

Journal of Applied Physics

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We have studied the energy splitting of bound photonic states in Kerr-nonlinear double photonic waveguides. The structure is formed by embedding two Kerr-nonlinear photonic crystals in a linear photonic crystal. When an intense external laser field is applied to the system, two coupled waveguides are induced. These waveguides may also be induced by applying a stress field to the system. Due to the coupling between waveguides, bound states split into symmetric and antisymmetric pairs. Using the transfer matrix method we obtained expressions for these split bound states and their energy separation. We have shown that the energy splitting depends on the separation of the waveguides and the intensity of the applied laser. The energy splitting predicted by our expressions agrees well with the splitting of resonant states in simulated transmission spectra. Our findings agree qualitatively with existing experimental observations of coupled photonic wells fabricated from photonic crystals. We found that the bound state energy levels can be tuned using the laser and stress fields, and that the system can be switched between zero to one or more pairs of resonant states. The results described here can be used to develop all-optical switches, tunable filters and nonlinear coupled waveguides.

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Improvement of spectral efficiency based on spectral splitting in photonic quantum-well structures

Cited by 8 publications

References 20 publications

Resonant Tunneling in Photonic Double Quantum Well Heterostructures

Resonant Tunneling in Photonic Double Quantum Well Heterostructures

Use of photonic quantum well as tunable defect in multilayer narrowband reflection-and-transmission filter

Energy splitting of resonant photonic states in nonlinear nanophotonic double waveguides

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