Magnetically tunable terahertz magnetoplasmons in ferrofluid-filled photonic crystals

Fan, Fei; Chen, Sai; Lin, Wei; Miao, Yinping; Chang, Shengjiang; Liu, Bo; Wang, Xianghui; Lin, Lie

doi:10.1063/1.4826454

Cited by 49 publications

(22 citation statements)

References 23 publications

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“…Four refractive index matching (RIM) liquids with different refractive indexes were fully filled in the space of Si column intervals. The RIM liquid used in our experiment is a kind of nanofluid composed of Fe 3 O 4 nanoparticles dispersed in the light mineral oil carrier [20], [21], and we have made up of four different nanoparticle concentrations of 3.9%, 7.9%, 11.8% and 17.7%, respectively. Before our investigation for the PCs, we measured the refractive index and absorption coefficient of these four RIM liquids by the THz TDS system as shown in Fig.…”

Section: Device Fabrication and Measurementmentioning

confidence: 99%

Terahertz Refractive Index Sensing Based on Photonic Column Array

Fan

Chen

Wang

et al. 2015

IEEE Photon. Technol. Lett.

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Terahertz (THz) silicon photonic column (PC) array has been designed and fabricated, and its resonance effect has been experimentally and numerically investigated. Using this resonance effect, the refractive index sensing for liquids has been demonstrated in this device by the theoretical model calculation, numerical simulation, and experimental measurement. Moreover, resonance dependence on different incident angles in this device has also been shown. These results confirm that this THz PC array can be used as a THz refractive index sensor with high sensitivity and robustness. This sensing strategy shows that the structured surface of this device is compatible for liquid monitoring and easy to couple and transmit THz waves, and therefore can be more easily implemented in liquid refractive index sensing.

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Section: Device Fabrication and Measurementmentioning

confidence: 99%

Terahertz Refractive Index Sensing Based on Photonic Column Array

Fan

Chen

Wang

et al. 2015

IEEE Photon. Technol. Lett.

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“…The gratings used in our experiments are fabricated by MEMs technology3940. A 500 μm thickness Si wafer with a high resistivity of 10 kΩ cm is cleaned and a 5 μm layer of photoresist is spun onto the wafer.…”

Section: Methodsmentioning

confidence: 99%

“…φ g ( ω ) (that is φ TE ( ω ) or φ TM ( ω )) is the phase specrum of grating sample, and φ air ( ω ) is that of air reference. The effective refractive index can be calculated by394041…”

Section: Methodsmentioning

confidence: 99%

Artificial high birefringence in all-dielectric gradient grating for broadband terahertz waves

Chen

Fan

et al. 2016

Sci Rep

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Subwavelength dielectric gratings are widely applied in the phase and polarization manipulation of light. However, the dispersion of the normal dielectric gratings is not flat while their birefringences are not enough in the THz regime. In this paper, we have fabricated two all-dielectric gratings with gradient grids in the THz regime, of which artificial birefringence is much larger than that of the equal-grid dielectric grating demonstrated by both experiments and simulations. The transmission and dispersion characteristics are also improved since the gradient grids break the periodicity of grating lattices as a chirp feature. From 0.6–1.4 THz, a broadband birefringence reaches 0.35 with a low dispersion and good linearity of phase shift, and the maximum phase shift is 1.4π. Furthermore, these gradient gratings are applied as half-wave plates and realize a linear polarization conversion with a conversion rate over 99%, also much higher than the equal-grid gratings. These gradient gratings show great advantages compared to the periodic gratings and provide a new way in the designing of artificial birefringence material.

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“…The magneto-optical (MO) material is introduced into the artificial EM micro structure such as magnetic photonic crystal or magnetoplasmonics 12,13 , has become a research hotspot in recent years 14 . Through the reasonable design of device structure, MO effect can be significantly enhanced by plasmonic resonance or bandgap effect 15,16 ; conversely, magneto-optical effect will lead to the splitting of plasmonic resonance, nonreciprocal transmission, giant Faraday rotation effect and other new physical mechanism and phenomena [17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Terahertz isolator in metal plate waveguide

2014

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In this work, we present a terahertz (THz) isolator in metal parallel plate waveguide (PPWG). A magneto-optical film with 30um thickness is coated on one side of the metal plate of PPWG with 100um width, forming a metal-magnetoair-metal hybrid waveguide. Due to the non-reciprocity of magneto-optical medium and the asymmetry of the waveguide structure, this waveguide show a strong one-way transmission property. The numerical simulation shows that this THz isolator has a maximum isolation of 30dB and a 20dB operating bandwidth of 90GHz under a magnetic field of 0.3T, and its insertion loss is smaller than 0.5dB. Moreover, this operating frequency band can be widely tuned by changing the external magnetic field and temperature. This low-loss, high isolation, broadband tunable nonreciprocal THz waveguide has a great potential for THz application systems.

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Magnetically tunable terahertz magnetoplasmons in ferrofluid-filled photonic crystals

Cited by 49 publications

References 23 publications

Terahertz Refractive Index Sensing Based on Photonic Column Array

Terahertz Refractive Index Sensing Based on Photonic Column Array

Artificial high birefringence in all-dielectric gradient grating for broadband terahertz waves

Terahertz isolator in metal plate waveguide

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