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Proceedings ArticleDOI

Integrated disk resonator on substrateless dielectric waveguide platform for terahertz switch applications

TL;DR: In this paper , a terahertz single-pole double-throw (SPDT) switch based on an integrated disk resonator for a substrateless dielectric platform made of an all-silicon-based effective medium is presented.
Abstract: We present a terahertz single-pole double-throw (SPDT) switch based on an integrated disk resonator for a substrateless dielectric platform made of an all-silicon-based effective medium. The switch operates based on photoexcitation by using visible light focused onto the disk resonator to turn off the resonance, thus removing coupling between two waveguides. The result shows low insertion loss of the proposed switch due to the low dissipation of the platform. The device achieves an extinction ratio of 11 dB and 1.5 GHz of terahertz bandwidth. This terahertz switch can be employed in various terahertz applications including phase shifting and beam steering.
Citations
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Proceedings ArticleDOI
01 Nov 2022
TL;DR: In this paper , a disk resonator and a photonic crystal cavity based on a sub-strateless dielectric waveguide platform are proposed for terahertz applications.
Abstract: In the past two decades, terahertz technology has been steadily improved with a wide range of scientific studies to develop terahertz applications. Recently, a substrateless dielec-tric waveguide platform based on effective medium has been proposed. Waveguiding on this silicon-based platform can be realized with low loss and low dispersion. One important series of components for this platform includes resonant cavities of different characteristics that are crucial for terahertz integrated systems. In this article, we present one design of a disk resonator, and one design of a photonic crystal cavity based on this sub-strateless dielectric waveguide platform. These cavities operate within the frequency range of 220–330 GHz. The simulation and measurement results of these resonant cavities show a strong resonant behavior, with a resonance Q-factor that can be tuned. These cavities can be employed in various terahertz applications including sensing, switching, and modulation.
References
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Journal ArticleDOI
TL;DR: This work proposes substrate-less all-dielectric waveguides defined by an effective medium with a subwavelength hole array built solely into a single silicon wafer to minimize significant absorption in metals and dielectrics at terahertz frequencies.
Abstract: Terahertz communications is a promising modality for future short-range point-to point wireless data transmission at rates up to terabit per second. A milestone towards this goal is the development of an integrated transmitter and receiver platforms with high efficiency. One key enabling component is a planar waveguiding structure with wide bandwidth and low dispersion. This work proposes substrate-less all-dielectric waveguides cladded by an effective medium for low-loss and low dispersion terahertz transmission in broadband. This self-supporting structure is built solely into a single silicon wafer with air perforations to mitigate significant absorptions in metals and dielectrics at terahertz frequencies. The realized waveguides can cover the entire 260 to 400 GHz with single dominant modes in both orthogonal polarizations. The simulation shows that for the E_11^x mode the attenuation ranges from 0.003 to 0.024 dB/cm over the entire band, while it varies from 0.008 to 0.023 dB/cm for the E_11^y mode. Limited by the measurement setup, the maximum error-free data rate of 28 Gbit/s is experimentally achieved at 335 GHz on a 3-cm waveguide. We further demonstrate the transmission of uncompressed 4K-resolution video across this waveguide. This waveguide platform promises integration of diverse active and passive components. Thus, we can foresee it as a potential candidate for the future terahertz integrated circuits, in analogy to photonic integrated circuits at optical frequencies.

34 citations

Journal ArticleDOI
TL;DR: In this paper, effective medium-clad dielectric waveguides with low loss and low dispersion were investigated for terahertz-integrated platforms, and the results showed an average measured attenuation coefficient of 0.075 dB/cm and a group velocity dispersion ranging from around 10ps/THz/mm across the whole band.
Abstract: Effective-medium-clad dielectric waveguides are purely built into a single high-resistivity float-zone silicon wafer with their claddings defined by deep subwavelength perforations. The waveguides are substrate-free while supporting both $E_{11}^x$ and $E_{11}^y$ modes with low loss and low dispersion. This article extends the investigations of the waveguides by analyzing the dispersion, cross-polarization, and crosstalk together with the characteristics of bends and crossings over an operation frequency range of 220–330 GHz (WR-3 band). Taking the $E_{11}^x$ mode as an example, the experimental results show an average measured attenuation coefficient of 0.075 dB/cm and a group velocity dispersion ranging from around $\pm$ 10 ps/THz/mm across the whole band. A crosstalk level below $-$ 10 dB is measured for parallel waveguides with a separation of 0.52 $\lambda _{0}$ at 300 GHz. The realized waveguides show a bending loss ranging from 0.500 to 0.025 dB per bend and a crosstalk at crossing below $-$ 15 dB from 220 to 330 GHz. Due to the different dispersion characteristics, the $E_{11}^y$ mode has similar performances but with its operation frequency range reduced to 260–330 GHz. Limited by the measurement setup, a cross-coupling between the $E_{11}^x$ and $E_{11}^y$ modes is measured to be below $-$ 20 dB over the whole band. This in-depth investigation of effective-medium-clad waveguides will form a basis for terahertz-integrated platforms.

33 citations

Journal ArticleDOI
TL;DR: In this article, the effects of patterning the cladding or the core layer of a three-layer optical waveguide on the polarization properties of propagating radiation were examined, where the core material is a semiconductor with optical gain.
Abstract: Uniaxially patterned (UAP) dielectric layers have an optical anisotropy that can be externally controlled. This paper examines the effects of patterning the cladding or the core layer of a three-layer optical waveguide on the polarization properties of propagating radiation. Particular attention is paid to the case when the core material is a semiconductor with optical gain. A number of devices are discussed based on incorporating a UAP layer in the structure design, such as a polarization-insensitive amplifier, a polarizer, an optically controlled polarization switch, and an optically controlled modal coupler

25 citations