Photonics Engineer

Coherent Corp.•Santa Clara, CA

6h•Hybrid

About The Position

Coherent is a global leader in lasers, engineered materials and networking components. We are a vertically integrated manufacturing company that develops innovative products for diversified applications in the industrial, optical communications, military, life sciences, semiconductor equipment, and consumer markets. Coherent provides a comprehensive career development platform within an environment that challenges employees to perform at their best, while rewarding excellence and hard-work through a competitive compensation program. It's an exciting opportunity to work for a company that offers stability, longevity and growth. Come Join Us!

Requirements

M.S. or Ph.D. in Electrical Engineering, Applied Physics, Materials Science, or related field.
3+ years of experience in VCSEL, photonics, or optoelectronic device R&D.
Hands-on experience with nanofabrication (EBL, RIE, PVD/ALD/CVD).
Proficiency with optical and electrical modeling tools (Lumerical, COMSOL, or equivalent).
Experience with high-speed (GHz+) optoelectronic testing.
Experience working with 2D materials (e.g., graphene) in optoelectronic applications.

Nice To Haves

Knowledge of graphene doping and gate-tunable devices.
Experience in cross-site collaboration and vendor management (international).
Familiarity with backside-emitting VCSEL architectures and photonic crystal design.
Strong interpersonal, teaming, and problem-solving skills.
Work effectively with other members of Coherent Corp. xxxxx.

Responsibilities

Design and model backside-emitting VCSEL structures optimized for 1060 nm emission.
Develop and simulate photonic crystal cavity structures to enhance light–graphene interaction.
Optimize device parameters for >100 GHz 3 dB bandwidth, <3 V modulation bias, and >3 dB extinction ratio.
Collaborate with Graphenea on graphene deposition and doping strategies.
Evaluate doping approaches (boron and molecular adsorbate) for Fermi level tuning and resistance control.
Define gate oxide materials and thicknesses to minimize RC time constants in device performance.
Work with Coherent’s Sherman facility to coordinate deposition, patterning, and etching processes.
Oversee e-beam lithography (EBL) and reactive ion etching (RIE) for photonic crystal patterning.
Integrate ITO contacts and graphene layers for electrical backgating.
Perform electrical efficiency and high-speed modulation testing of graphene-based VCSELs.
Conduct optical reflection and modulation experiments using spectrometers, beamsplitters, and photodiodes.
Collaborate with Coherent teams in Fremont and Stanford University for advanced characterization.
Work cross-functionally with materials scientists, process engineers, and external partners.
Maintain detailed experiment logs, test reports, and contribute to patent filings and publications.