Silicon (Si)

Silicon 1

Silicon (Si) is a versatile material widely used in optics, particularly in the infrared (IR) region. It is highly transparent to IR light making it ideal for lenses, windows, and filters in IR imaging systems and spectroscopy. Silicon also has a high refractive index (around 3.4), allowing for effective light manipulation in optical devices. Additionally, its excellent thermal conductivity and stability make it suitable for high-power laser applications and harsh environments. Silicon’s compatibility with semiconductor manufacturing processes further enables the integration of optical components with electronic systems, enhancing the development of advanced photonic devices.

Optical Properties

Refractive Index: 3.42

Thermal Co-efficient of Refractive Index: 1.5 x 10-6

Transmission Range: 1.2 – 9.0 µm

Thermal Properties

Thermal Linear Expansion: 2.6 x 10-6 /°C at 20°C

Thermal Conductivity: 163.3 W m⁻¹ K⁻¹  at 273 K

Specific Heat Capacity: 703 J Kg⁻¹ K⁻¹

Melting Point: 1420 °C

Mechanical Properties

Density: 2.33 g/cc

Knoop Hardness: 1150

Young Modulus: 131 GPa

Shear Modulus: 79.9 GPa

Poisson Ratio: 0.266

Wavelength (µm)Refractive Index (n)
1.3573.4975
1.3673.4962
1.3953.4929
1.5293.4795
1.6603.4696
1.7093.4664
1.8133.4608
1.9703.4537
2.1533.4476
2.3253.4430
2.7143.4358
3.0003.4320
3.3033.4300
3.5003.4284
4.0003.4257
4.2583.4245
4.5003.4236
5.0003.4223
5.5003.4213
6.0003.4202
6.5003.4195
7.0003.4189
7.5003.4186
8.0003.4184
8.5003.4182
10.003.4179
10.503.4178
11.043.4176
Silicon 3

Inquiry Form

Contact Form

We suggest using your organization's email with its own domain (if any).

Scroll to Top