Extremely small red-green-blue beam combiners for compact projection-type displays

Katsuyama, T.; Nakao, Akiko; Ogawa, Kosuke; Tsujino, Kenta; Takahata, Kohei

doi:10.1117/12.2072420

Cited by 5 publications

(3 citation statements)

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“…The two main types of RGB couplers are the traditional prism and fiber type 4 and the integrated optical waveguide technology type. The former is characterized by its relatively complex structure and bulky size, while the latter boasts a small size, high efficiency, compact structure, and stable performance.…”

Section: Introductionmentioning

confidence: 99%

Inverse design of an ultracompact RGB coupler with subwavelength structure

Lu¹,

Chen²,

Jiang³

et al. 2023

International Conference on Optoelectronic Information and Functional Materials (OIFM 2023)

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We present an approach to the design of an RGB coupler for miniature projection and near-eye display devices using a photonic crystal-like sub-wavelength (PhC-SW) structure based on the SiN-SiO2 photonic integration platform. The proposed device was optimized using an inverse design method. By etching pixelated air holes on the SiN core layer, light propagation can be controlled by modulating the equivalent refractive index. This approach results in a device with an ultra-compact size of 3×4µm 2 , which is one of the smallest reported design size for the RGB coupler. In addition, the proposed design could achieve transmission efficiencies of 72.10%, 84.41% and 90.16% insertion losses (IL) of -1.42dB, -0.74dB and -0.45dB, and 3dB bandwidth of -270.73dB, -248.20dB and -224.32dB at the RGB lights, respectively. This new method would provide a compact and efficient solution for the miniaturization of RGB couplers.

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Section: Introductionmentioning

confidence: 99%

Inverse design of an ultracompact RGB coupler with subwavelength structure

Lu¹,

Chen²,

Jiang³

et al. 2023

International Conference on Optoelectronic Information and Functional Materials (OIFM 2023)

View full text Add to dashboard Cite

show abstract

“…We have fabricated a new ultracompact RGB laser beam combiner 4,5 that is the size of a grain of rice (see Figures 1 and 2). The combiner comprises three optical waveguides for RGB light inputs and three directional couplers.…”

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confidence: 99%

“…At 0:06 7:8mm in size, the combiner is one order of magnitude smaller than a conventional mirror-type equivalent. 5 With this level of miniaturization, our RGB combiner is suitable for use in compact image displays such as eyewear projectors.…”

mentioning

confidence: 99%