A metal/insulator/metal (MIM) structure with gold nanoantennas enhances the mid-infrared photodetection performance of HgTe colloidal quantum dots (CQDs). The structure significantly increases the absorption of the CQD film, leading to a 23-fold enhancement in absorption and a 15-fold improvement in detectivity compared to a bare sapphire substrate. The MIM structure achieves a peak detectivity of 9×10⁹ Jones at 2650 cm⁻¹ and 80 kHz, which is much higher than conventional pyroelectric sensors. The enhanced performance is attributed to the strong optical coupling between the nanoantennas and the CQD film, which increases the local electric field and enhances the absorption. The MIM structure also improves the photoluminescence of the CQD film by 16-fold, indicating a potential Purcell enhancement. The study confirms the viability of lithographically designed nanoantenna structures for improving the performance of mid-infrared CQD photoconductors. The results demonstrate that the MIM structure can significantly enhance the responsivity and detectivity of mid-infrared photodetectors, making them more suitable for applications such as gas sensing. The study also highlights the importance of optimizing the optical and electrical properties of the CQD film to achieve high performance in photodetectors. The results suggest that further improvements in the performance of mid-infrared CQD detectors can be achieved by enhancing the radiative recombination efficiency of the CQD film. The study provides a comprehensive understanding of the optical and electrical properties of the MIM structure and its impact on the performance of mid-infrared CQD photodetectors. The results demonstrate the potential of MIM structures for enhancing the performance of mid-infrared CQD photodetectors and highlight the importance of optimizing the optical and electrical properties of the CQD film for high-performance photodetectors.A metal/insulator/metal (MIM) structure with gold nanoantennas enhances the mid-infrared photodetection performance of HgTe colloidal quantum dots (CQDs). The structure significantly increases the absorption of the CQD film, leading to a 23-fold enhancement in absorption and a 15-fold improvement in detectivity compared to a bare sapphire substrate. The MIM structure achieves a peak detectivity of 9×10⁹ Jones at 2650 cm⁻¹ and 80 kHz, which is much higher than conventional pyroelectric sensors. The enhanced performance is attributed to the strong optical coupling between the nanoantennas and the CQD film, which increases the local electric field and enhances the absorption. The MIM structure also improves the photoluminescence of the CQD film by 16-fold, indicating a potential Purcell enhancement. The study confirms the viability of lithographically designed nanoantenna structures for improving the performance of mid-infrared CQD photoconductors. The results demonstrate that the MIM structure can significantly enhance the responsivity and detectivity of mid-infrared photodetectors, making them more suitable for applications such as gas sensing. The study also highlights the importance of optimizing the optical and electrical properties of the CQD film to achieve high performance in photodetectors. The results suggest that further improvements in the performance of mid-infrared CQD detectors can be achieved by enhancing the radiative recombination efficiency of the CQD film. The study provides a comprehensive understanding of the optical and electrical properties of the MIM structure and its impact on the performance of mid-infrared CQD photodetectors. The results demonstrate the potential of MIM structures for enhancing the performance of mid-infrared CQD photodetectors and highlight the importance of optimizing the optical and electrical properties of the CQD film for high-performance photodetectors.