Thursday, May 14, 2026

Diamond Nanophotonic & Optomechanical Membrane

Enabling Next-Generation Photonics, Quantum Sensing, and Light-Driven Mechanics

Executive Summary

The rapid evolution of nanophotonics and optomechanics is redefining how light interacts with matter—not only as a carrier of information, but also as a mechanical actuator at the micro- and nanoscale. DIASEMI introduces a diamond-based nanophotonic membrane platform that enables simultaneous control of:

Optical phase, polarization, and spin–orbital states
Mechanical motion driven by radiation pressure and angular momentum
Quantum and sensing functionalities enabled by diamond’s unique material properties

Leveraging ultra-thin CVD diamond membranes (1–10 μm) combined with advanced subwavelength structuring and femtosecond laser machining, DIASEMI delivers a scalable solution for integrated photonics, optomechanical systems, and quantum devices.

Technology Overview

Light as a Mechanical and Optical Tool

Photons carry both linear momentum (radiation pressure) and angular momentum (spin and orbital), enabling:

Optical trapping and manipulation (optical tweezers)
Torque generation on birefringent microstructures
Light-driven actuation and switching
Nonlinear optical interactions (e.g., two-photon absorption)

DIASEMI’s platform harnesses these effects through engineered diamond nanostructures, enabling devices that both shape light and respond mechanically.

Form-Birefringent Diamond Nanostructures

Subwavelength grating structures induce form birefringence (Δn = nₑ − nₒ), allowing precise control of:

Polarization states
Spin–orbital coupling (q-plates)
Spectral filtering and dichroism
Phase retardation across wide wavelength ranges

These structures enable advanced optical functionalities across UV → IR → THz regimes, leveraging diamond’s broadband transparency.

Why Diamond? (DIASEMI Advantage)

DIASEMI’s platform is built on high-quality CVD diamond membranes with unmatched properties:

Property	Value / Benefit
Thermal conductivity	Up to 2000 W/m·K
Optical transparency	X-ray to far-IR
Refractive index	~2.4 (ideal for photonics)
Bandgap	5.45 eV (deep UV compatibility)
Mechanical strength	ieal for MEMS/NEMS
Quantum compatibility	NV⁻ centers for sensing

Key Advantage:
Diamond uniquely combines optical, mechanical, and quantum functionalities in a single material platform.

DIASEMI Fabrication Platform

1. Lithography-Based Nanostructuring (High Precision)

Electron-beam lithography (EBL)
Reactive ion etching (RIE)
Subwavelength gratings (Λ: 0.8–7 μm)
Aspect ratios up to ~15

Applications:

Infrared birefringent optics
Polarization control elements
Photonic crystal structures

2. Femtosecond Laser Micro-Machining (High Flexibility)

230 fs pulse duration @ 1030 nm
Sub-micron precision over cm-scale areas
Graphitization-assisted cutting & ablation
Direct structuring of 1 μm membranes

Capabilities:

Suspended optomechanical structures
Stress-relief patterning
Rapid prototyping without masks

Optomechanical Structures

DIASEMI enables fabrication of ultra-sensitive suspended diamond devices, including:

Micro-bridges (≤10 μm width)
Membrane-supported platforms
Resonant mechanical elements

These structures exhibit:

High sensitivity to optical forces
Tunable mechanical resonance
Strong coupling to light fields

Result: Ideal for precision sensing, actuation, and quantum optomechanics.

Optical Performance

Infrared Birefringent Response

Tunable dichroism (positive ↔ negative)
Polarization-dependent absorption and transmission
Quarter-wave phase control via structural design
Broadband operation (2.5–15 μm demonstrated)

Subwavelength Effects

Λ ≈ λ regime enables:
- Enhanced light–matter interaction
- Diffraction-controlled transmission
- Field localization at diamond–air interfaces

Key Innovations

DIASEMI’s platform introduces:

Thin (<10 μm) free-standing diamond photonic membranes
Hybrid fabrication (EBL + fs-laser)
Integrated opto-mechanical functionality
Spectral tunability via geometry-controlled birefringence
Stress-engineered flatness for high-yield fabrication

Applications

Photonics & Optics

IR windows and filters
Polarization converters (q-plates)
Photonic crystal devices
Beam shaping and phase control

Quantum Technologies

NV-based sensing platforms
Quantum photonics integration
Spin–photon interfaces

Optomechanics

Light-driven MEMS/NEMS
Precision force and torque sensors
Levitated particle systems

Thermal & Harsh Environments

High-power laser systems
Aerospace and defense optics
Extreme environment sensing

Manufacturing Challenges Solved by DIASEMI

Challenge	DIASEMI Solution
Membrane warping	Stress-relief laser patterning
Substrate non-flatness	Adaptive fabrication workflows
Fragility of thin diamond	Controlled thinning + support design
Large-area nanopatterning	fs-laser scalability
Multi-physics integration	Unified material platform

Future Roadmap

DIASEMI is advancing toward:

Wafer-scale diamond photonic platforms
Integrated quantum–photonic–mechanical systems
AI-designed nanophotonic structures
Hybrid diamond–Si/SiC/AlN/GaN integration

Conclusion

DIASEMI’s diamond nanophotonic membrane platform represents a paradigm shift in photonics and optomechanics, enabling:

Light to control matter
Structures to control light
And diamond to unify both

This technology unlocks new possibilities in precision sensing, quantum systems, and high-performance photonic devices, positioning DIASEMI at the forefront of next-generation photonics innovation.

Wednesday, May 13, 2026

Standard Diasemi diamond and copper composite heatsink

1. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 15x15x0.3 ±0.1mm

Ra: 0.5um

2. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 15x15x0.5 ±0.1mm

Ra: 0.5um

3. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 15x15x1.0 ±0.1mm

Ra: 0.5um

4. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 15x15x1.5 ±0.1mm

Ra: 0.5um

5. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 15x15x2.0 ±0.1mm

Ra: 0.5um

6. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 20x20x0.3 ±0.1mm

Ra: 0.5um

7. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 20x20x0.5 ±0.1mm

Ra: 0.5um

8. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 20x20x1.0 ±0.1mm

Ra: 0.5um

9. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 20x20x1.5 ±0.1mm

Ra: 0.5um

10. Copper Diamond Composite Cu Coated

Dimensions Tolerances: 20x20x2.0 ±0.1mm

Ra: 0.5um

Tuesday, May 12, 2026

DIASEMI Ultra-Thin AlN Insulated Diamond–Copper Heat Spreader

DIASEMI presents an advanced diamond–copper composite heat spreader featuring an ultra-thin aluminum nitride (AlN) ceramic coating (1–2 μm) for high-performance thermal management with electrical insulation.

Unlike conventional thick ceramic layers, the sub-micron AlN coating is deposited via precision thin-film processes, dramatically reducing thermal resistance while maintaining excellent dielectric strength and interface reliability.

Key Features

Ultra-thin AlN insulation: 1–2 μm (minimized thermal barrier)
Exceptional thermal conductivity: up to 600–900 W/m·K (composite core)
High dielectric strength: suitable for power electronics isolation
Low thermal resistance interface: optimized for high heat flux devices
Robust adhesion: engineered interfacial layer for long-term stability
CTE matching: tailored for GaN, SiC, and advanced semiconductor packages

Performance Advantage

By reducing the ceramic coating thickness from conventional tens of microns to 1–2 μm, DIASEMI achieves:

>30–50% reduction in interfacial thermal resistance
Improved heat dissipation efficiency under >1 kW/cm² heat flux
Enhanced reliability under thermal cycling

Applications

GaN / SiC power modules
High-power laser diode packages
RF and microwave systems
AI and high-density computing hardware

Positioning

The DIASEMI solution bridges the gap between high thermal conductivity materials and electrical insulation, enabling next-generation compact, high-power semiconductor systems where both heat removal and dielectric isolation are critical.

DIASEMI Ceramic Coating Insulated Diamond–Copper Heatsink

www.diasemi.us

DIASEMI introduces an advanced insulated diamond–copper composite engineered for next-generation high-power electronic and photonic systems. By integrating a dense Al₂O₃ ceramic layer via aerosol deposition, the inherently conductive Cu/diamond composite is transformed into a high-performance, electrically insulating thermal management platform.

The Al₂O₃ coating preferentially anchors onto the ductile copper matrix, forming a continuous, conformal insulating layer while progressively extending across diamond surfaces from the Cu–diamond interface. This unique deposition mechanism enables full electrical isolation without compromising thermal pathways. A ~9 μm-thick ceramic layer delivers ultra-high electrical resistivity (~10¹² Ω·cm), increasing bulk resistance by more than 14 orders of magnitude.

Critically, the composite retains an ultra-high thermal conductivity of ~800 W/m·K—far exceeding conventional ceramic-based solutions. Compared with diamond–SiC composites, the DIASEMI insulated diamond–copper platform provides superior thermal conductivity, improved thermal spreading efficiency, and comparable thermal expansion matching.

This work establishes insulated Cu/diamond as a breakthrough material platform that bridges the gap between metals and ceramics, enabling high-voltage, high-heat-flux applications.

Introduction (DIASEMI Technical Positioning)

Thermal Management Challenge in High-Power Systems

The continuous scaling of power density in semiconductor devices—such as IGBTs, RF amplifiers, and high-energy laser systems—has pushed thermal management materials beyond traditional limits. Materials must simultaneously deliver:

Ultra-high thermal conductivity
Electrical insulation
Coefficient of thermal expansion (CTE) compatibility
Mechanical reliability under thermal cycling

Material Landscape: Diamond-Based Composites

Two leading material systems have emerged:

1. Diamond–SiC (Ceramic Matrix Composite)

Diamond/SiC composites are widely adopted due to their intrinsic electrical insulation and good thermal stability. However:

Thermal conductivity typically ranges 200–800 W/m·K
Phonon scattering at diamond–SiC interfaces limits performance
Limited tunability of properties due to ceramic processing constraints

2. Diamond–Copper (Metal Matrix Composite)

Cu/diamond composites offer:

Exceptional thermal conductivity (>800 W/m·K)
Excellent thermal spreading due to metallic matrix
Tunable CTE via diamond loading and interface engineering

However, their electrical conductivity prohibits direct use in high-voltage environments, historically limiting their application scope.

DIASEMI Breakthrough: Insulated Diamond–Copper Composite

DIASEMI overcomes this fundamental limitation by introducing a ceramic insulation layer (Al₂O₃) via aerosol deposition (AD):

Room-temperature process → preserves interface integrity
Dense, pinhole-free ceramic coating
Conformal coverage across heterogeneous Cu–diamond surface
No degradation of thermal pathways

Deposition Mechanism Insight

Al₂O₃ preferentially deposits on the soft Cu matrix, smoothing surface roughness
Growth initiates at Cu–diamond interfaces, ensuring strong anchoring
Coating propagates across diamond surfaces, forming a continuous insulating layer
Smaller diamond particles enhance coating uniformity due to higher interfacial area

Performance Comparison: DIASEMI vs Diamond–SiC

Property	DIASEMI Insulated Cu/Diamond	Diamond/SiC Composite
Thermal Conductivity	500~850 W/m·K	200–800 W/m·K
Electrical Property	Insulating (Al₂O₃ layer)	Intrinsically insulating
Thermal Spreading	Excellent (metal matrix)	Moderate
CTE (ppm/K)	5–8 (tunable)	3–6
Processing Temperature	Room temperature (AD coating)	High-temperature sintering
Interface Control	Engineered carbide + coating	Limited
Power Device Suitability	Excellent (IGBT, RF, laser)	Good

Key Advantages of DIASEMI Insulated Cu/Diamond

3–4× higher thermal conductivity vs Diamond/SiC
Maintains electrical insulation without sacrificing heat dissipation
Superior thermal spreading → reduced hot spots
Scalable, low-temperature coating process
High reliability under thermal cycling

Application Positioning

The DIASEMI insulated diamond–copper platform is optimized for:

High-voltage power modules (IGBT, SiC MOSFET)
High-power laser diode packaging
RF and microwave systems
Advanced photonics and optical platforms
Aerospace and defense thermal systems

Saturday, May 9, 2026

DIASEMI DICU Diamond and copper composite heatsink

DIASEMI™ DICU Ultra Thermal™ Series

Diamond / Copper High Thermal Conductivity Composite

Engineered Heat Spreader Platform for Extreme Power Density

1. Product Overview

DIASEMI™ D-Cu Ultra Thermal™ is a next-generation diamond-reinforced copper composite designed for ultra-high heat flux applications.

By integrating engineered carbide interlayers (TiC / WC / ZrC) with optimized diamond architecture, the material achieves exceptional thermal conductivity with tailored thermal expansion, enabling reliable operation in next-generation semiconductor and photonics systems.

2. Key Features

Ultra-high thermal conductivity: up to 850 W·m⁻¹·K⁻¹
CTE matching to semiconductors: 6–8 ×10⁻⁶ K⁻¹
Low interfacial thermal resistance via engineered carbide bonding
High density (>99%) for maximum heat transport efficiency
Excellent thermal stability under high power cycling
Customizable geometry and thickness

3. Typical Applications

Semiconductor & Electronics

GaN / SiC RF power devices
Laser diode heat spreaders
High-performance CPUs / GPUs
Power modules (IGBT, MOSFET)

Photonics

High-power laser packaging
Optical benches
IR / EUV systems thermal platforms

Advanced Systems

Aerospace electronics
Fusion / high-energy systems
Microwave and RF components

4. Material Specifications

Property	Typical Value	Test Method
Thermal Conductivity	700 – 850 W·m⁻¹·K⁻¹	Laser Flash
Coefficient of Thermal Expansion (CTE)	6 – 8 ×10⁻⁶ K⁻¹	Dilatometry
Density	> 99% theoretical	Archimedes
Specific Heat	~385 J·kg⁻¹·K⁻¹	DSC
Electrical Resistivity	2–4 µΩ·cm	Four-point probe
Bending Strength	250–350 MPa	ASTM C1161
Operating Temperature	up to 500°C (air)	—

5. Interface Engineering Options

(A) WC Interface (Standard Industrial Grade)

Interlayer: 180–220 nm WC
Thermal conductivity: 750–820 W·m⁻¹·K⁻¹
Best for: scalable production, cost-performance balance

(B) TiC Interface (High-End Performance Grade)

Interlayer: 200–250 nm TiC
Thermal conductivity: 800–850 W·m⁻¹·K⁻¹
Best for: extreme heat flux, premium devices

(C) ZrC Interface (High Reliability Grade)

Interlayer: 150–250 nm ZrC
Thermal conductivity: 600–750 W·m⁻¹·K⁻¹
Best for: harsh environments, long lifetime systems

6. Microstructure Design

Parameter	Specification
Diamond Type	Synthetic (HPHT / CVD compatible)
Particle Size	100 – 200 µm (optimized)
Volume Fraction	60 – 70%
Distribution	Uniform / bimodal optional
Interface Layer	Continuous carbide coating

7. Available Formats

Plates: up to 100 × 100 mm
Thickness: 0.3 – 5 mm
Custom shapes:
- Laser cut
- CNC machined
- Metallized (Ni/Au optional)

8. Surface & Finishing Options

Polished (Ra < 50 nm available)
Double-side lapping
Metallization:
- Ni / Au
- Ti / Pt / Au
Direct bonding ready surfaces

9. Process Technology

DIASEMI utilizes a hybrid manufacturing platform:

Diamond surface metallization
- Magnetron sputtering
- Salt bath / diffusion coating
Composite formation:
- Pressure melt infiltration (preferred)
- Vacuum hot pressing
- SPS (R&D / prototyping)

10. Performance Benchmark

Material	Thermal Conductivity (W·m⁻¹·K⁻¹)	CTE (×10⁻⁶ K⁻¹)
Copper	~400	17
AlN	170–200	4.5
SiC	180–270	4
CVD Diamond	1200–2000	1–2
DIASEMI D-Cu Ultra Thermal™	700–850	6–8

11. Design Advantages

✔ Compared to Copper

2× higher thermal conductivity
50% lower CTE

✔ Compared to Ceramics (AlN / SiC)

3–4× higher thermal conductivity
Better heat spreading capability

✔ Compared to CVD Diamond

Lower cost
Easier machining
Better CTE matching

12. Reliability

Thermal cycling stability: >1000 cycles (−40°C to 200°C)
No delamination at interface
مقاومة عالية للتعب الحراري (high thermal fatigue resistance)

13. Design Guidelines

Optimal interlayer thickness: ~200 nm
Avoid excessive coating thickness (>300 nm)
Maintain high diamond volume fraction (~65%)
Ensure high Cu purity (≥99.99%)

14. Ordering Information

Product Code Format:


DIASEMI-Dcu-[Interface]-[Size]-[Thickness]-[Finish]

Example:
DIASEMI-Dcu-WC-50x50-1.0mm-NiAu

15. Customization Options

Tailored CTE for specific chips (GaN / Si / SiC)
Gradient interface design
Microchannel integration for liquid cooling
Large-area substrates

16. Summary

DIASEMI™ D-Cu Ultra Thermal™ provides:

The optimal balance between ultra-high thermal conductivity, manufacturability, and system compatibility

It bridges the gap between:

CVD diamond (performance)
Copper (cost & processability)

www.diasemi.us

Tuesday, May 5, 2026

DIASEMI Pre-AR Coated CVD Diamond Window Dies for the Photonics Industry

Enabling the Next Generation of Miniaturized Optical Systems

As photonics systems continue to scale toward higher power densities, smaller footprints, and harsher operating environments, the demand for advanced optical window materials has intensified. Applications in optical communications, high-power lasers, and sensing technologies require materials that simultaneously deliver:

High optical transmission
Exceptional thermal conductivity
Mechanical robustness
Long-term environmental stability

Conventional optical materials—such as fused silica or sapphire—often fail to meet all these requirements simultaneously. This limitation has driven increasing interest in CVD diamond, a material uniquely positioned at the intersection of optics, thermal management, and extreme durability.

DIASEMI introduces a breakthrough solution:

Pre-AR Coated CVD Diamond Window Dies

A Fundamental Shift in Optical Coating Architecture

Traditional approaches rely on depositing anti-reflective (AR) coatings after the diamond substrate has been fabricated and polished. While effective for large optics, this method becomes impractical for micro-scale window dies (sub-millimeter dimensions), where handling, alignment, and coating uniformity present major challenges.

DIASEMI’s innovation reverses this paradigm.

Instead of post-processing, we implement a pre-deposition architecture, where the optical coating is engineered before diamond growth. This approach integrates thin-film optics directly into the material synthesis process, leveraging principles of thin film interference at the earliest stage of fabrication.

Technology Overview

1. Pre-Engineered Optical Coating Layer

A precisely designed anti-reflective coating is deposited onto a sacrificial substrate using advanced thin-film deposition techniques (PVD or CVD). Material systems are selected based on wavelength requirements:

SWIR (0.8–1.5 µm): SiO₂, Si₃N₄
MWIR / LWIR: Y₂O₃, HfO₂, ZrO₂, rare-earth oxides

Layer thickness is optimized according to optical interference conditions to minimize surface reflection.

2. Direct CVD Diamond Growth

High-quality diamond is then grown directly on the AR-coated surface using chemical vapor deposition (CVD). During this process:

Diamond inherits the optical interface
The AR coating undergoes in-situ thermal stabilization (~800–900°C)
A robust, low-defect interface is formed

This step also ensures compatibility with high-power photonic environments.

3. Precision Microfabrication

Following growth, the diamond surface is:

Mechanically polished to optical grade (Ra ≤ 10 nm)
Laser diced into micro-scale dies (down to <500 µm)
Plasma treated to remove graphitic residues

4. Sacrificial Substrate Removal

The original substrate is selectively removed via chemical or plasma etching, leaving behind a self-supported diamond window with an integrated AR coating.

Key Advantages

Native Integration of Optical Functionality

The AR coating is not an add-on—it is structurally integrated into the diamond window. This eliminates interface weaknesses associated with post-deposition coatings.

Wafer-Level Manufacturing of Micro Windows

DIASEMI’s process enables batch fabrication of ultra-small optical dies, overcoming the limitations of conventional coating techniques.

Superior Thermal and Mechanical Stability

Because the coating is exposed to the full CVD growth environment, it achieves:

High thermal stability
Strong adhesion
Reduced residual stress

Enhanced Optical Performance

Optimized AR coatings significantly reduce Fresnel reflection at the diamond interface, improving transmission efficiency across target wavelengths.

Reduced Processing Complexity and Cost

By eliminating post-growth coating steps, the process:

Simplifies manufacturing flow
Improves yield
Enables scalable production

Performance Characteristics

Typical DIASEMI Pre-AR Diamond Window Dies offer:

Transmission: >98% (design-dependent)
Surface roughness: ≤ 10 nm
Thickness: 5–50 µm
Die size: down to 0.3–0.5 mm
Thermal conductivity: up to 2000 W/m·K (diamond bulk)

Application Areas

DIASEMI’s pre-AR coated diamond windows are engineered for demanding photonics applications, including:

Optical communication modules (SWIR band ~1.0–1.5 µm)
High-power laser systems (e.g., ~1 µm wavelength platforms)
Infrared sensing and imaging systems
Harsh-environment optical sensors
MEMS and micro-photonic packaging

Sunday, April 26, 2026

CVD diamond films/membrane/foil for electronic components

CVD diamond films/membrane/foil for electronic components

CVD diamond films are among the most advanced materials for thermal management in high-power and high-density electronics. Their value as heat spreaders comes from a unique combination of physical and chemical properties that few materials can match.

Key Advantages of CVD Diamond Heat Spreaders

1. Exceptional Thermal Conductivity

CVD diamond exhibits thermal conductivity in the range of 1200–2200 W/m·K, exceeding copper (~400 W/m·K) and even high-end graphite. Heat transport is dominated by lattice vibrations (phonons), making it highly efficient and stable across a wide temperature range.

This is governed by the phonon transport mechanism in the diamond lattice.

2. Electrical Insulation

Unlike metals, diamond is electrically insulating (wide bandgap ~5.5 eV), which allows:

Direct integration with semiconductor devices
Elimination of additional insulating layers
Reduced parasitic capacitance

3. Low Thermal Expansion

Diamond has a very low coefficient of thermal expansion (~1 ppm/K), which is close to:

Silicon
Gallium Nitride

This minimizes thermal stress and improves reliability in power cycling environments.

4. High Thermal Stability & Chemical Inertness

Stable up to ~700–800°C in air
Resistant to corrosion and radiation
Ideal for harsh environments (space, nuclear, plasma systems)

5. High Breakdown Strength

Useful in high-voltage applications where insulation and thermal dissipation must coexist.

6. Tailorable via Doping or Composite Integration

Can be doped (e.g., boron-doped diamond) for semi-conductive behavior
Can be metallized (Ti, Mo, W layers) for better interface bonding

Typical Applications

1. Power Electronics

Used as heat spreaders or substrates for:

Gallium Nitride (GaN HEMTs)
Silicon Carbide (SiC MOSFETs)

Enables higher power density, reduced junction temperature, and longer device lifetime.

2. RF & Microwave Devices

Critical in high-frequency, high-power systems:

Radar modules
Satellite communications
5G/6G base stations

Diamond improves thermal handling in GaN-on-diamond architectures.

3. Laser Diodes & Photonics

High-power laser diode heat sinks
Optical windows (due to transparency + thermal performance)

Used in:

Industrial lasers
Medical lasers
Defense systems

4. Advanced Packaging & 3D Integration

Heat spreaders in chiplets and stacked ICs
Replacement for Cu/Mo or AlN substrates

Especially important as power densities exceed 1 kW/cm².

5. Aerospace & Defense

Thermal management in satellites and avionics
Radiation-resistant electronics
High-power microwave tubes (e.g., gyrotrons)

6. Emerging Applications

AI accelerators and high-performance computing (HPC)
Electric vehicle power modules
Fusion and EUV lithography systems

SEMIXICON DIASEMI standard diamond films models in bulk supply

www.semixicon.com