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- Liu, Qingkun, et al.
(författare)
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Switchable polarization-sensitive surface plasmon resonance of highly stable gold nanorods-liquid crystals composites
- 2011
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Ingår i: Optoelectronic Materials and Devices VI. - Washington, D.C. : SPIE. - 9780819489616
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Konferensbidrag (refereegranskat)abstract
- In this work, we demonstrate the bulk self-alignment of gold nanorods (GNRs) dispersed in lyotropic nematic liquid crystals (LCs) with high optical absorption coefficient at the surface plasmon resonant wavelength. The polymer-coated GNRs which show spontaneous long-range orientational ordering along the director of LC host exhibit long-term stability as well as high concentration. External magnetic field and shearing allow for alignment and realignment of the orientation of gold nanorods by changing the director of the liquid crystal matrix. This results in a switchable polarization-sensitive surface plasmon resonance exhibiting stark differences from that of the same nanorods in isotropic fluids. The devise-scale bulk nanoparticle alignment may enable optical metamaterial mass production and control of surface plasmon resonance of nanoparticles.
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| 2. |
- Wang, Zhechao, et al.
(författare)
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Experimental realization of a low-loss nano-scale Si hybrid plasmonic waveguide
- 2011
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Ingår i: Optics InfoBase Conference Papers. - Washington : Optical Society of America. - 9781557529060
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Konferensbidrag (refereegranskat)abstract
- A novel hybrid plasmonic waveguide with nano-scale confinement, consisting of a metal layer separated from a SOI nano-rib by a thin silica layer has been realized. The loss of 0.01dB/μm allows for ultra-high density photonic integration.
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| 8. |
- Li, Hui, et al.
(författare)
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Angle and polarization diversity in compact dual-antenna terminals with chassis excitation
- 2011
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Ingår i: URSI Gen. Assem. Sci. Symp., URSIGASS. - 9781424451173 - 9781424460519
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Konferensbidrag (refereegranskat)abstract
- For multiple antennas on a compact terminal chassis, chassis current excitation can severely increase mutual coupling between the antennas. This is because the same characteristic mode of the chassis may be strongly excited by more than one antenna. Here, we propose to use one antenna that exploits chassis excitation and introduce a second antenna that minimizes chassis excitation. In this way, angle and polarization diversity can be realized. The concept is illustrated and verified through the design of a practical dual-antenna prototype at 920 MHz, which achieves an isolation of over 30 dB and total efficiencies of above 80%.
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| 9. |
- Li, Hui, et al.
(författare)
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Impact of current localization on the performance of compact MIMO antennas
- 2011
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Ingår i: Proceedings of the 5th European Conference on Antennas and Propagation. - 9788882020743 - 9781457702501 ; , s. 2423-2426
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Konferensbidrag (refereegranskat)abstract
- In this paper, we study the influence of current localization on the isolation between two antennas in a compact terminal setting. The two antennas are chosen to be a monopole and a PIFA. The degree of current localization is controlled by the permittivity value of the PIFA's dielectric loading. Both lossless and lossy cases are simulated in order to ascertain the underlying performance impact from current localization and its potential use in real implementation. Our results show that significant isolation enhancement is achieved with more localized currents. Moreover, the technique improves the terminal's diversity and capacity performance both at the center frequency and over a given bandwidth. In addition, PIFAs with dielectric loadings of higher permittivity values and more localized currents are physically smaller. Antenna prototypes are fabricated, and the measured results agree well with the simulated results.
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| 10. |
- Wang, Binhao, et al.
(författare)
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DETECTION OF GAS CONCENTRATION BY CORRELATION SPECTROSCOPY USING A MULTI-WAVELENGTH FIBER LASER
- 2011
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Ingår i: PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER. - 1559-8985 .- 1070-4698. ; 114, s. 469-479
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Tidskriftsartikel (refereegranskat)abstract
- A correlation spectroscopy (COSPEC) based on a multi-wavelength fiber laser is first proposed for the detection of gas concentration. The lasing wavelengths are selected to match several characteristic absorption peaks of the gas under test, and the gas concentration is easily measured by correlating it with the reference gas. The present method is immune from the instability of the light source and the influence of other gases. The concentration measurement of C2H2 is demonstrated in the experiment in its near-infrared dominant absorption region. The technique has prospects for simultaneous detection of multiple gases, and the measurement of mixed gases of C2H2 and CO2 is also analyzed.
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