Double-grating polarizer for terahertz radiation with high extinction ratio

Sun, Lin; Lv, Zhihui; Wu, Wei; Liu, Wei-Tao; Yuan, Jianmin

doi:10.1364/ao.49.002066

Cited by 19 publications

(18 citation statements)

References 22 publications

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“…However, this would also induce an undesired drop of T TM . The dual-metallic grating (DMG) structure was proposed to achieve both high transmittance and large ER [6][7][8][9]. By introducing the DMG structures in both sides of CaF 2 substrate, a broadband polarizer was designed with average extinction ratio over 70 dB and transmittance over 64% in the range of 0.3 to 5µm [6].…”

Section: Introductionmentioning

confidence: 99%

Broadband and wide angle infrared wire-grid polarizer

Dai¹,

Wan²,

Zhu³

et al. 2015

Opt. Express

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An infrared polarizer consisting of metal-insulator-metal (MIM) gratings is designed with transmittance exceeding 85% and polarization extinction ratio (ER) higher than 70 dB in the wavelength range from 1.5 to 8 μm. Moreover, the polarizer retains excellent performance even when the incident angle increases to as large as 80°. The MIM gratings support magnetic polariton (MP) in the near-infrared regime and operate non-resonantly in the mid-infrared regime, both of which result in the advantages of high extinction ratio, broadband, and wide angle. The proposed structure can find applications in polarizer, beam-splitter, filter, and isolator in the infrared range.

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Section: Introductionmentioning

confidence: 99%

Broadband and wide angle infrared wire-grid polarizer

Dai¹,

Wan²,

Zhu³

et al. 2015

Opt. Express

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“…This moves feature sizes from the nm range of instruments for visible light to the easy to handle and visible-by-eye (sub-)mm range. Often, the function of a device can be directly recognized, e.g., that of (wire grid) polarizers 132 or, as we show in the following, a blazed grating. For a given incidence angle, the reflection condition a in ¼ a out coincides only for one specific wavelength with the grating condition, mk ¼ gðsin a out À sin a in Þ of the m th order, with g being the grating period.…”

Section: A Interference-based Terahertz Opticsmentioning

confidence: 99%

Tunable, continuous-wave Terahertz photomixer sources and applications

Preu

Döhler

Malzer

et al. 2011

Journal of Applied Physics

424

293

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Realization of gigahertz-frequency impedance matching circuits for nano-scale devices Appl. Phys. Lett. 101, 053108 (2012) Synchronization of a renewable energy inverter with the grid J. Renewable Sustainable Energy 4, 043103 (2012) Monolithic high-temperature superconducting heterodyne Josephson frequency down-converter Appl. Phys. Lett. 100, 262604 (2012) Generation of pure phase and amplitude-modulated signals at microwave frequencies Rev. Sci. Instrum. 83, 064705 (2012) Additional information on J. Appl. Phys. This review is focused on the latest developments in continuous-wave (CW) photomixing for Terahertz (THz) generation. The first part of the paper explains the limiting factors for operation at high frequencies $ 1 THz, namely transit time or lifetime roll-off, antenna (R)-device (C) RC rolloff, current screening and blocking, and heat dissipation. We will present various realizations of both photoconductive and p-i-n diode-based photomixers to overcome these limitations, including perspectives on novel materials for high-power photomixers operating at telecom wavelengths (1550 nm). In addition to the classical approach of feeding current originating from a small semiconductor photomixer device to an antenna (antenna-based emitter, AE), an antennaless approach in which the active area itself radiates (large area emitter, LAE) is discussed in detail. Although we focus on CW photomixing, we briefly discuss recent results for LAEs under pulsed conditions. Record power levels of 1.5 mW average power and conversion efficiencies as high as 2 Â 10 À3 have been reached, about 2 orders of magnitude higher than those obtained with CW antenna-based emitters. The second part of the paper is devoted to applications for CW photomixers. We begin with a discussion of the development of novel THz optics. Special attention is paid to experiments exploiting the long coherence length of CW photomixers for coherent emission and detection of THz arrays. The long coherence length comes with an unprecedented narrow linewidth. This is of particular interest for spectroscopic applications, the field in which THz research has perhaps the highest impact. We point out that CW spectroscopy systems may potentially be more compact, cheaper, and more accurate than conventional pulsed systems. These features are attributed to telecom-wavelength compatibility, to excellent frequency resolution, and to their huge spectral density. The paper concludes with prototype experiments of THz wireless LAN applications. For future telecommunication systems, the limited bandwidth of photodiodes is inadequate for further upshifting carrier frequencies. This, however, will soon be required for increased data throughput. The implementation of telecom-wavelength compatible photomixing diodes for down-conversion of an optical carrier signal to a (sub-)THz RF signal will be required.

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“…Sun et al have proposed a similar idea in Ref. 6 and numerically analyzed the polarizing efficiency of the grating polarizer. Furthermore, as its high transmittance for TM waves, the metallic gratings are much more transparent than thin metal layers or ITO films, which is propitious to the performance of corresponding devices.…”

Section: Design and Fabricationmentioning

confidence: 99%

“…1 A number of THz applications ranging from basic spectral characterization of materials 2 to biological imaging and sensing, 3 high speed communication 4 and security applications 5 have been realized. Passive components to guide and manipulate THz waves, like polarizers, 6,7 switches 8, 9 and filters 10,11 are thus in high demand. A number of materials have been investigated for these components.…”

Section: Introductionmentioning

confidence: 99%

Self-polarizing terahertz liquid crystal phase shifter

Lin

et al. 2011

AIP Advances

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Using sub-wavelength metallic gratings as both transparent electrodes and broadband high-efficiency polarizers, a highly-compact self-polarizing phase shifter is demonstrated by electrically tuning the effective birefringence of a nematic liquid crystal cell. The metal grating polarizers ensure a good polarizing efficiency in the range of 0.2 to 2 THz. Phase shift of more than π/3 is achieved in a 256 μm-thick cell with a saturation root mean square voltage of around 130 V in this integrated device

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Double-grating polarizer for terahertz radiation with high extinction ratio

Cited by 19 publications

References 22 publications

Broadband and wide angle infrared wire-grid polarizer

Broadband and wide angle infrared wire-grid polarizer

Tunable, continuous-wave Terahertz photomixer sources and applications

Self-polarizing terahertz liquid crystal phase shifter

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