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1. Terahertz anisotropic response of additively manufactured one-dimensional photonic crystals

   https://doi.org/10.1364/OL.422929  

   Park, Serang; Stinson, V_Paige; Boreman, Glenn_D; Hofmann, Tino (July 2021, Optics Letters)

   A polymer-based, one-dimensional photonic crystal exhibiting anisotropic responses was demonstrated in the terahertz frequency range. The photonic crystal was composed of alternating compact and low-density polymethacrylate layers. The low-density layers consisted of sub-wavelength sized columns, which were slanted 45° with respect to the substrate surface normal to achieve form-birefringence. Normal incidence polarized terahertz transmission measurements were carried out for characterization of the fabricated photonic crystals in the range from 82 to 125 GHz. The experimental data revealed a 2 GHz shift in the center frequency of the photonic bandgap as a function of in-plane orientation, well demonstrating the anisotropic behavior of the fabricated crystal. The transmission data were analyzed using stratified optical layer model calculations. A good agreement was found between the relevant model parameters and the corresponding design parameters. 

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2. Mechanical Control of the Optical Bandgap in One-Dimensional Photonic Crystals

   https://doi.org/10.3390/mi13122248  

   Stinson, V. Paige; Shuchi, Nuren; McLamb, Micheal; Boreman, Glenn D.; Hofmann, Tino (December 2022, Micromachines)

   Over the last several years, two-photon polymerization has been a popular fabrication approach for photonic crystals due to its high spatial resolution. One-dimensional photonic crystals with photonic bandgap reflectivities over 90% have been demonstrated for the infrared spectral range. With the success of these structures, methods which can provide tunability of the photonic bandgap are being explored. In this study, we demonstrate the use of mechanical flexures in the design of one-dimensional photonic crystals fabricated by two-photon polymerization for the first time. Experimental results show that these photonic crystals provide active mechanically induced spectral control of the photonic bandgap. An analysis of the mechanical behavior of the photonic crystal is presented and elastic behavior is observed. These results suggest that one-dimensional photonic crystals with mechanical flexures can successfully function as opto-mechanical structures. 

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3. A three-dimensional photonic topological insulator using a two-dimensional ring resonator lattice with a synthetic frequency dimension

   https://doi.org/10.1126/sciadv.aat2774  

   Lin, Qian; Sun, Xiao-Qi; Xiao, Meng; Zhang, Shou-Cheng; Fan, Shanhui (October 2018, Science Advances)

   In the development of topological photonics, achieving three-dimensional topological insulators is of notable interest since it enables the exploration of new topological physics with photons and promises novel photonic devices that are robust against disorders in three dimensions. Previous theoretical proposals toward three-dimensional topological insulators use complex geometries that are challenging to implement. On the basis of the concept of synthetic dimension, we show that a two-dimensional array of ring resonators, which was previously demonstrated to exhibit a two-dimensional topological insulator phase, automatically becomes a three-dimensional topological insulator when the frequency dimension is taken into account. Moreover, by modulating a few of the resonators, a screw dislocation along the frequency axis can be created, which provides robust one-way transport of photons along the frequency axis. Demonstrating the physics of screw dislocation in a topological system has been a substantial challenge in solid-state systems. Our work indicates that the physics of three-dimensional topological insulators can be explored in standard integrated photonic platforms, leading to opportunities for novel devices that control the frequency of light. 

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4. Mechanical tunability in one-dimensional photonic crystals fabricated by direct laser writing

   https://doi.org/10.1117/12.2658707  

   Stinson, Victoria P.; Shuchi, Nuren Z.; McLamb, Micheal; Boreman, Glenn D.; Hofmann, Tino (March 2023, SPIE OPTO)

   Piyawattanametha, Wibool; Park, Yong-Hwa; Zappe, Hans (Ed.)

   Recently, two-photon polymerization has been successfully employed to fabricate high-contrast one-dimensional photonic crystals. Using this approach, photonic bandgap reflectivities over 90% have been demonstrated in the infrared spectral range. As a result of this success, modifications to the design are being explored which allow additional tunability of the photonic bandgap. In this paper, a one-dimensional photonic crystal fabricated by two-photon polymerization which has been modified to include mechanical flexures is evaluated. Experimental findings suggest these structures allow mechanically induced spectral shifting of the entire photonic bandgap. These results support the use of one-dimensional photonic crystals fabricated by two-photon polymerization for opto-mechanical applications. 

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5. A polarization encoded photon-to-spin interface

   https://doi.org/10.1038/s41534-020-00337-3  

   Chen, K. C.; Bersin, E.; Englund, D. (December 2021, npj Quantum Information)

   null (Ed.)

   Abstract We propose an integrated photonics device for mapping qubits encoded in the polarization of a photon onto the spin state of a solid-state defect coupled to a photonic crystal cavity: a “polarization-encoded photon-to-spin interface” (PEPSI). We perform a theoretical analysis of the state fidelity’s dependence on the device’s polarization extinction ratio and atom–cavity cooperativity. Furthermore, we explore the rate-fidelity trade-off through analytical and numerical models. In simulation, we show that our design enables efficient, high fidelity photon-to-spin mapping. 

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