Large-area, ultra-lightweight SWIR-MWIR flat lenses with extended depth-of-focus
Abstract
Conventional refractive optics used in cameras are often too heavy due to the multiple lenses required to correct image aberrations, such as chromatic and off-axis aberrations. We propose developing flat lenses for the SWIR-MWIR wavelengths (1 to 5 µm) that will be at least ten times lighter than traditional refractive lenses. Additionally, we aim to enhance the depth of focus at f/1.5 by at least twice the diffraction-limited values. Our target field-of-view (FOV) for the MDL will be 450 degrees. This project will involve creating proof-of-concept prototypes, as well as developing the underlying design methodologies and theoretical advancements.Relevance to the Navy: Compact, lightweight, and cost-effective imaging solutions in the SWIR-MWIR bands are critical for shipboard situational awareness, where weight is crucial for fast aiming and stabilization. Small, unmanned, and airborne systems are also significantly impacted by weight. Our proposal aims to reduce the weight of camera optics by at least 10 times. Additionally, our optics offer a cost-effective solution, making them suitable for use in potentially expendable shipboard cameras that are difficult to repair.In the future, low-cost nanoimprint lithography will enable further cost reductions in manufacturing our optics.Objectives: In this3-year research project, we have three main objectives:#Validation of Feasibility: Use a combination of theory and numerical experiments to validate the feasibility of large aperture (~61mm diameter), fast (f/1.5) broadband SWIR-MWIR (1 to 5µm) flat lenses. Theselenses will be at least 10 times lighter than their refractive counterparts and have an extended depth of focus.#Prototype Development: Fabricate and characterize proof-of-concept prototype flat lenses.#Depth of Focus Extension: Demonstrate, using simulations andpreliminary experiments, an extension of the depth of focus compared to the diffraction limit.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 13, 2025
- Source ID
- N000142512122
Entities
People
- Rajesh Menon
Organizations
- Office of Naval Research
- United States Navy
- University of Utah