  Superconducting nanowires are very important due to their applications
ranging from quantum technology to astronomy. In this work, we implement a
non-invasive process to fabricate nanowires of high-$T_\text{c}$ superconductor
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (BSCCO). We demonstrate that our nanowires
can be used as bolometers in the visible range with very high responsivity of
9.7 $\times$ 10$^{3}$ V/W. Interestingly, in a long (30 $\mu$m) nanowire of 9
nm thickness and 700 nm width, we observe bias current-dependent localized
spots of maximum photovoltage. Moreover, the scalability of the bolometer
responsivity with the normal state resistance of the nanowire could allow
further performance improvement by increasing the nanowire length in a meander
geometry. We observe phase slip events in nanowires with small cross-sections
(12 nm thick, 300 nm wide, and 3 $\mu$m long) at low temperatures. Our study
presents a scalable method for realizing sensitive bolometers working near the
liquid-nitrogen temperature.
