Two Individual Super-Bound State Modes within Band Gap with Ultra-High

Yinbing An, Tao Fu, Chunyu Guo, Jihong Pei, Zhengbiao Ouyang

Abstract read

In one paragraph

Article in Sensors (Basel, Switzerland), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

5 authors.

Yinbing AnCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Tao FuGuangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, China.

Chunyu GuoCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.ORCID 0000-0001-5223-208X

Jihong PeiCollege of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China.

Zhengbiao OuyangCollege of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.ORCID 0000-0002-1466-7813

Funding

National Natural Science Foundation of China 61275043, 61307048, 60877034, 61605128Natural Science Foundation of Guangdong Province 2020A1515011154Natural Science Foundation of Shenzhen City JCYJ20190808151017218, JCYJ20190808161801637, JCYJ20180305124247521

6 · The paper itself

Abstract

Bound states in the continuum (BICs) garnered significant research interest in the field of sensors due to their exceptionally high-quality factors. However, the wide-band continuum in BICs are noise to the bound states, and it is difficult to control and filter. Therefore, we constructed a top-bottom symmetric cavity containing three high permittivity rectangular columns. The cavity supports a symmetry-protected (SP) superbound state (SBS) mode and an accidental (AC) SBS mode within the bandgap. With a period size of 5 × 15, the bandgap effectively filters out the continuum, allowing only the bound states to exist. This configuration enabled us to achieve a high signal-to-noise ratio and a wide free-spectral-range. The AC SBS and the SP SBS can be converted into quasi-SBS by adjusting different parameters. Consequently, the cavity can function as a single-band sensor or a dual-band sensor. The achieved bulk sensitivity was 38 µm/RIU in terahertz wave band, and a record-high FOM reached 2.8 × 10

Indexed as

bound state in continuummulti-wavelength sensorphotonic band gaprefractive index sensorsuper bound state

Identifiers

PMID37571521

DOI10.3390/s23156737

PMCPMC10422254

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