| 1. |
- Liu, Hairong, et al.
(författare)
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Design and analysis of anti-resonant reflecting photonic crystal VCSEL lasers
- 2004
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Ingår i: Optics Express. - 1094-4087. ; 12:18, s. 4269-4274
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Tidskriftsartikel (refereegranskat)abstract
- Anti-resonant reflecting photonic crystal structure is employed in vertical cavity surface emitting lasers (VCSELs) to achieve photon confinement in lateral direction. Such a design is promising in supporting large-aperture single-mode emission. In the configuration, hexagonal arrays of high-index cylinders which run vertically in the cladding region are introduced in the VCSEL's top DBR (p-DBR) mirror region. The transverse modal property of the proposed structure, especially leakage loss, has been theoretically investigated. An optimum design for the minimum radiation loss while maintaining single-mode operation has been discussed in this paper.
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| 2. |
- Liu, Hairong, et al.
(författare)
-
Design and analysis of anti-resonant reflecting photonic crystal VCSEL lasers
- 2004
-
Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 12:18, s. 4269-4274
-
Tidskriftsartikel (refereegranskat)abstract
- Anti-resonant reflecting photonic crystal structure is employed in vertical cavity surface emitting lasers (VCSELs) to achieve photon confinement in lateral direction. Such a design is promising in supporting large-aperture single-mode emission. In the configuration, hexagonal arrays of high-index cylinders which run vertically in the cladding region are introduced in the VCSEL’s top DBR (p-DBR) mirror region. The transverse modal property of the proposed structure, especially leakage loss, has been theoretically investigated. An optimum design for the minimum radiation loss while maintaining single-mode operation has been discussed in this paper.
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| 3. |
- Liu, Hairong, et al.
(författare)
-
Optimum design of anti-resonant reflecting photonic crystal vertical-cavity surface-emitting lasers
- 2005
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Ingår i: Chinese Optics Letters. - 1671-7694. ; 3:SUPPL, s. S210-S212
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Tidskriftsartikel (refereegranskat)abstract
- Anti-resonant reflecting photonic crystal structure in vertical-cavity surface-emitting lasers (VCSELs) to achieve photon confinement in lateral direction is introduced. This kind of design is proposed to support large aperture single-mode emission. A proper method to fabricate the proposed structure has also been discussed. Firstly a spacer layer will be fabricated between the active layer and pDBR layer. A hexagonal array of high-index cylinders will be designed by etching and re-growth on the spaced layer. The transverse modal property of the proposed structure has been investigated. An optimum design for the minimum radiation loss by considering of the cylinder diameter has been discussed in this paper.
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| 4. |
- Liu, Hairong, et al.
(författare)
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Theoretical investigation on guiding IR light in hollow-core metallic fiber with corrugated inner surface
- 2010
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Ingår i: Optics Express. - 1094-4087. ; 18:21, s. 21959-21964
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Tidskriftsartikel (refereegranskat)abstract
- Hollow metallic fibers (HMFs) are in general lossy primarily owing to the fact that the guided transverse-magnetic (TM) light sustains a relatively high propagation loss. In this paper, we propose a type of practical hollow-core metallic fiber (HMF) with longitudinally corrugated inner surface for transmitting infrared (IR) light. Simulation results show that the loss of the fundamental TM mode can be easily reduced by 50 similar to 100 times compared to a HMF without surface corrugation. In contrast to the traditional HMF with a dielectric coating, it is shown that the loss of the fundamental TM mode in the proposed HMF is relatively insensitive to the corrugation layer thickness or equivalently the operating frequency.
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| 5. |
- Liu, Hairong, et al.
(författare)
-
Theoretical investigation on guiding IR light in hollow-core metallic fiber with corrugated inner surface
- 2010
-
Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 18:21, s. 21959-21964
-
Tidskriftsartikel (refereegranskat)abstract
- Hollow metallic fibers (HMFs) are in general lossy primarily owing to the fact that the guided transverse-magnetic (TM) light sustains a relatively high propagation loss. In this paper, we propose a type of practical hollow-core metallic fiber (HMF) with longitudinally corrugated inner surface for transmitting infrared (IR) light. Simulation results show that the loss of the fundamental TM mode can be easily reduced by 50~100 times compared to a HMF without surface corrugation. In contrast to the traditional HMF with a dielectric coating, it is shown that the loss of the fundamental TM mode in the proposed HMF is relatively insensitive to the corrugation layer thickness or equivalently the operating frequency.
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| 6. |
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| 7. |
- Deng, Kaiqiang, et al.
(författare)
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The offshore wind speed changes in China: an insight into CMIP6 model simulation and future projections
- 2024
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Ingår i: CLIMATE DYNAMICS. - 0930-7575 .- 1432-0894.
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Tidskriftsartikel (refereegranskat)abstract
- Offshore wind speed in China plays a key role in affecting air-sea interactions, coastal tides, and wind energy, but its changes in a warming climate and the associated causes remain unclear. Based on the ERA5 reanalysis and the Coupled Model Intercomparison Project Phase 6 (CMIP6) models, this study evaluates the past and future variations of wind speed at 10 m (WS10) over China's offshore seas in summer and winter. The results show that the CMIP6 multi-model mean performs well in simulating the climatological patterns (1981-2010) of WS10 for both seasons. The trends and leading variabilities in WS10 are also reasonably reproduced in the South China Sea (SCS). In the northern SCS, WS10 has strengthened during both seasons in the recent decades. In contrast, in the East China Sea (ECS), WS10 has increased (decreased) during summer (winter). Further attribution analysis suggests that the forcing of greenhouse gasses (aerosols) may make WS10 stronger (weaker) in the two seas and for both seasons, while natural variability tends to slow down (speed up) WS10 in the SCS and ECS during summer (winter). In addition, according to the CMIP6 model projections under various warming scenarios, WS10 is likely to increase over both the northern SCS and the ECS in summer, while WS10 will increase over the northern SCS but decrease over the ECS in winter. Differences in the projected WS10 changes in the ECS during summer and winter are attributed to the projected intensification (weakening) of the East Asian summer (winter) monsoon circulation.
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