Diffractive Diffusers

NIL Technology offers diffractive diffusers that can be custom designed to generate any speckle-free pattern with almost any intensity profile and field-of-view (FOV). We have extensive experience developing and producing diffractive diffusers where pinpoint accuracy is essential for fulfilling our customers’ most demanding requirements

4-level DOE used for a diffractive diffuser

4-level DOE used for a diffractive diffuser. Our micro- and nano-fabrication competencies enable us to generate well-defined DOE patterns resulting in high quality diffusers.

Why choose NIL Technology to make your diffractive diffusers?

NIL Technology can satisfy your requests for any customized diffusers and will be with you from design to prototyping to mass production. We revel in tackling challenging designs, and specialize in fabricating nanoscale feature sizes and ultra-accurate alignment enabling us to be among the top global providers of diffractive optics.

Diffractive diffuser, NILT logo
Diffractive diffuser used to create a NILT logo, green laser

Diffractive diffuser used to create a NILT logo. With our expertise in nanofabrication, NILT can design and fabricate diffusers for different wavelengths depending on your requirements.

Optical applications of diffractive diffusers

Diffractive diffusers can be found in a wide array of applications such as LIDAR and face recognition. They are often a critical element in displays, diffuse- and structured-light systems, and time-of-flight (TOF) and other 3D sensing systems. NIL Technology has extensive experience, know-how, and proprietary technology directed to designing, prototyping, and fabricating diffusers for these and many other applications.

What are diffractive diffusers anyway?

Diffractive diffusers are diffractive optical elements (DOEs) with surface relief structures configured to diffract light. They are skillfully designed using sophisticated simulation algorithms to generate specific patterns and intensity profiles. This output is achieved by illuminating the DOE surface relief structures with light – typically in the visible or IR spectrum – which is then diffracted by the structures thereby creating a specific pattern and intensity profile.

Along with specific patterns, the intensity profiles can be critical for many applications. For example, 3D sensing and face recognition applications often require intensity profiles consisting of large grids of diffracted points with equal intensity, whereas for illumination applications, it can be preferable to create batwing or flat top intensity profiles to eliminate or suppress zero-order diffraction peaks (e.g., hot spots). However, these and other applications can be marred by suboptimal diffractive diffuser performance where even nano-sized errors in the surface relief structures will significantly degrade the optical properties of the diffuser – a main driver for why we have optimized our proprietary processes to achieve industry-leading precision and accuracy.

Simulation of output from a diffractive diffuser

Simulation of output from a diffractive diffuser.

Contact us if you would like to know more about what we can do for you.

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