Achieving High Transmission and Q Bragg Filter via Balancing Dissipation and Radiation Loss

Simultaneously high quality-factor (
Q
) and transmission (
T
) are highly desired in various optical, photonic, and optoelectronic applications such as filters, sensors, photodetectors and lasers. However, a trade-off between high
Q
and high
T
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
$_2$
O
$_5$
) and silica (SiO
$_2$
) stacks which enable high
Q
of 183 and high
T
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
$_2$
O
$_5$
) 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
T
values. We believe our work offers an efficient strategy for achieving high
Q
and
T
optical systems to meet diversified application requests.