| Summary: | Simultaneously high quality-factor (<italic>Q</italic>) and transmission (<italic>T</italic>) are highly desired in various optical, photonic, and optoelectronic applications such as filters, sensors, photodetectors and lasers. However, a trade-off between high <italic>Q</italic> and high <italic>T</italic> exists widely in optical systems thanks to the different physics triggers underneath. Here, as an example, we experimentally demonstrate a Bragg filter composed of niobium pentoxide (Nb<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>O<inline-formula><tex-math notation="LaTeX">$_5$</tex-math></inline-formula>) and silica (SiO<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>) stacks which enable high <italic>Q</italic> of 183 and high <italic>T</italic> of 91.3%. Balancing dissipation and radiation rate of the optical system is crucial to the performance of the device, which is validated by modulating the absorption of material (Nb<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>O<inline-formula><tex-math notation="LaTeX">$_5$</tex-math></inline-formula>) and the number of stacks. Further, with the principle the tunable Bragg filter is able to work in a similar way at optical wavelengths, i.e., maintaining almost unchanged FWHM (full width at half-maximum) and <italic>T</italic> values. We believe our work offers an efficient strategy for achieving high <italic>Q</italic> and <italic>T</italic> optical systems to meet diversified application requests.
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