What is Diffractive Optical Element (DOE) Technology?

Diffractive Optical Element (DOE) technology uses microscopic surface relief patterns – typically etched or embossed into glass, plastic, or silicon – to control the phase and amplitude of light waves through diffraction. Unlike refractive lenses (which bend light) or mirrors (which reflect light), DOEs split, shape, and redirect light into precise patterns based on the interference of light waves passing through or reflecting from a structured surface. Common functions include beam splitting (creating arrays of spots), beam shaping (converting a Gaussian laser profile into a uniform “top‑hat” or a ring), and diffusive scattering (creating controlled angles of illumination). In security holography, DOEs are used to generate machine‑readable codes, hidden images, and complex overt effects that are extremely difficult to counterfeit. Holoseal integrates custom DOE structures into hologram labels, providing an additional layer of covert and forensic security for brand protection.

🔬 How DOE Technology Works

A DOE is a surface relief pattern made of many tiny steps or continuous grooves, typically with features at the micron or sub‑micron scale. When a light wave (usually from a laser) hits the DOE, it is diffracted into multiple orders. By carefully designing the pattern (using scalar or vector diffraction theory), engineers can control the intensity, phase, and direction of the diffracted light. The most common design method is the Gerchberg‑Saxton (GS) algorithm or its variants, which iteratively calculate the phase profile needed to produce a desired output light distribution.

📦 Types of DOEs and Their Functions

• Beam splitters (gratings) – Split a single laser beam into an array of equal‑intensity spots (1×N or N×M). Used in laser processing, 3D sensing, and holographic projection.
• Beam shapers (top‑hat, ring, or custom pattern) – Convert a Gaussian laser profile into a uniform “top‑hat” spot or a donut ring. Used in laser welding, medical lasers, and LIDAR.
• Diffractive diffusers – Spread light uniformly over a defined angle (e.g., 20° × 30°). Replace traditional ground glass diffusers in projectors and illuminators.
• Multifocal lenses (lenslet arrays) – Create multiple focussed spots or a uniform illumination from a single laser.
• Security DOEs (kinegrams, machine‑readable codes) – Generate specific diffractive patterns (e.g., a hidden code or a unique optical signature) that can be read by a dedicated scanner or visible under a specific light condition.
• Diffractive waveplates / polarisation elements – Control polarisation state of light, used in advanced imaging systems.

🛡️ DOEs in Security Holography and Brand Protection

In the context of security labels and documents, DOEs are integrated into holograms or used as standalone diffractive features to provide covert and forensic authentication. Examples include:

• Machine‑readable DOVIDs – DOE structures that encode digital data (e.g., serial numbers, encrypted codes) readable by specialised optical readers at borders or checkpoints.
• Hidden images and latent patterns – DOE gratings that reveal an image only when illuminated by a laser or viewed through a specific decoder.
• Optically variable ink (OVI) replacements – DOEs can create colour‑shift effects without the need for special inks.
• Forensic authentication – Unique, custom‑designed DOE patterns that are virtually impossible to reverse‑engineer without the original digital design.

⚙️ DOE vs. Traditional Hologram – Key Differences

Aspect	Traditional Hologram	Diffractive Optical Element (DOE)
Primary purpose —	Reconstruct a 3D image of an object (visual).—	Perform an optical function (beam shaping, splitting, diffusing).
Design method —	Optical recording of interference from a real object or mask.—	Computer‑generated algorithm (e.g., iterative Fourier transform).
Output —	A 3D scene (image) visible to the eye.—	A controlled light distribution (spots, rings, uniform fields).
Typical use in security —	Overt authentication (tilt‑to‑see image).—	Covert / machine‑readable authentication (scannable codes).
Resolution required —~500 nm (laser origination).— ~10 nm to ~1 µm depending on design (e‑beam for high efficiency). Mass production — Yes (embossing from nickel shim).— Yes (same embossing process). 🔐 Benefits of Using DOEs in Brand Protection High security – DOE patterns are generated by proprietary algorithms; without the original design, they cannot be reproduced. Machine readability – DOEs can be encoded with digital data that is read by simple scanners, enabling automated authentication. Covert (hidden) features – A DOE may be invisible under normal light but creates a sharp pattern when illuminated by a laser pointer or dedicated reader. Tamper evident integration – DOEs can be combined with destructible or VOID adhesives, making the label both visually secure and machine‑verifiable. Cost‑effective mass production – Once the master shim is made, DOEs can be embossed into metalized film at high speed, similar to standard holograms. 🌍 Holoseal’s DOE Integration Capabilities Holoseal does not design DOEs in‑house. However, we partner with specialised origination houses that use advanced diffractive optics design software and e‑beam or laser lithography to create custom DOE masters. We can integrate these DOE structures into your hologram labels – either as a separate patch or as part of the overall diffractive pattern. Our 15+ years of experience ensure that the DOE feature is optimised for your authentication workflow (e.g., machine reading, laser verification, or smartphone‑based detection). We serve clients across India and worldwide. ❓ Frequently Asked Questions About DOE Technology Is a hologram a type of DOE? – In a broad sense, yes – a hologram is a diffractive optical element that reconstructs a wavefront. However, “DOE” typically refers to elements designed for a specific optical function (beam shaping, splitting) rather than image reconstruction. In security printing, the terms overlap. Can a DOE be seen with the naked eye? – Some DOEs (like those on banknotes) are designed to be visible as moving or colour‑shifting patterns. Others are invisible or appear only when illuminated by a laser or a specific light source (covert features). Are DOEs expensive to produce? – Master fabrication (e‑beam writing, etching) can be costly – typically ₹5–20 lakhs ($6,000–25,000 USD). However, once a nickel shim is made, embossed DOEs can be mass‑produced at a low per‑unit cost, like standard holograms. Can DOEs be counterfeited? – Extremely difficult. The master requires advanced lithography and rigorous optical design software, unavailable to counterfeiters. Cheap replicas lose the precise diffraction efficiency and pattern fidelity. What is the difference between a DOE and a DOVID? – A DOVID (diffractive optically variable image device) is a specific type of DOE that creates a visually variable image (e.g., switching, moving). All DOVIDs are DOEs, but not all DOEs are DOVIDs (e.g., a beam splitter DOE is not intended for human viewing). How to order DOE‑enhanced security labels from Holoseal? – Provide your desired optical effect (e.g., “laser‑readable 2D barcode” or “visible star field under tilt”). We will design the phase mask, arrange master fabrication, and supply embossed labels. Contact us for a consultation. 🔗 Related Glossary Terms What is a DOVID? What is a Hologram? What is Laser Diffraction? What is Dot Matrix Origination? What is E‑beam Origination? Holoseal – Your trusted partner for security hologram labels and holographic solutions in India and worldwide. ✔️ 15+ years of experience | ✔️ Trusted supplier | ✔️ Custom hologram sourcing | ✔️ Pan‑India & global delivery Request a Quote →    Browse Full Glossary Quick Links Holographic Solution Knowledge Hub RECENT BLOGS Case Study: Enhancing Textile Product Authenticity with Tamper Evident Hologram Labels Case Study: How a Cosmetic Brand Strengthened Product Authenticity Using Void Tamper Hologram Labels Securing Smart Devices: Tamper-Proof Hologram Stickers on IoT Hardware and Routers Industries Pharmaceutical Automobile Electronics Cosmetics FMCG Agriculture Food & Beverage Wine & Liquor Electrical Textile & Clothing Banking & Finance Education Chemical Construction Travel & Tourism Government Print & Packaging E-commerce HOLOSEAL - Unit of Blue Cap Ventures Registered Office : #13, 5th Floor, Tower-4, Vashi Railway Station Complex, Sector 30, Vashi, Navi Mumbai 400703, Maharashtra, INDIA. Phone : +91-8928 18 1178 | Email : sales@holoseal.in HOLOSEAL #13, 5th Floor, Tower-4, Vashi Station Complex,  Sector 30, Vashi, Navi Mumbai 400703,  Maharashtra, INDIA. Phone : +91-8928 18 1178 Email : sales@holoseal.in © 2026 Holoseal. All rights reserved Facebook Twitter Youtube Linkedin Instagram Pinterest Tumblr Medium Privacy Policy Shopping Basket